0.2.2 (#31)

Co-authored-by: Julien Valverdé <julien.valverde@mailo.com>
Co-authored-by: Renovate Bot <renovate-bot@valverde.cloud>
Reviewed-on: #31

.gitea/workflows/lint.yaml

@@ -7,10 +7,12 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Setup Bun
-        uses: oven-sh/setup-bun@v1
+        uses: oven-sh/setup-bun@v2
       - name: Clone repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Install dependencies
         run: bun install --frozen-lockfile
-      - name: Build
-        run: bun run build
+      - name: Lint TypeScript
+        run: bun lint:tsc
+      - name: Lint Biome
+        run: bun lint:biome

.gitea/workflows/publish.yaml

@@ -10,15 +10,19 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Setup Bun
-        uses: oven-sh/setup-bun@v1
+        uses: oven-sh/setup-bun@v2
       - name: Clone repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Install dependencies
         run: bun install --frozen-lockfile
+      - name: Lint TypeScript
+        run: bun lint:tsc
+      - name: Lint Biome
+        run: bun lint:biome
       - name: Build
         run: bun run build
       - name: Publish effect-fc
-        uses: JS-DevTools/npm-publish@v3
+        uses: JS-DevTools/npm-publish@v4
         with:
           package: packages/effect-fc
           access: public

.gitea/workflows/test-build.yaml

@@ -8,16 +8,20 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Setup Bun
-        uses: oven-sh/setup-bun@v1
+        uses: oven-sh/setup-bun@v2
       - name: Setup Node
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
-          node-version: "20"
+          node-version: "24"
       - name: Clone repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Install dependencies
         run: bun install --frozen-lockfile
+      - name: Lint TypeScript
+        run: bun lint:tsc
+      - name: Lint Biome
+        run: bun lint:biome
       - name: Build
         run: bun run build
       - name: Pack
-        run: bun run pack
+        run: bun pack

.npmrc

@@ -1 +0,0 @@
-@thilawyn:registry=https://git.valverde.cloud/api/packages/thilawyn/npm/

.vscode/settings.json

@@ -1,3 +1,6 @@
 {
-    "typescript.tsdk": "node_modules/typescript/lib"
+    "typescript.tsdk": "node_modules/typescript/lib",
+    "editor.codeActionsOnSave": {
+        "source.fixAll.biome": "explicit"
+    }
 }

README.md

@@ -1,9 +1,7 @@
-# Reffuse Monorepo
+# Effect FC Monorepo
 
-Reffuse is a [Effect-TS](https://effect.website/) integration for React 19+ with the aim of integrating the Effect context system within React's component hierarchy, while avoiding touching React's internals.
+[Effect-TS](https://effect.website/) integration for React 19+ that allows you to write function components using Effect generators.
 
 This monorepo contains:
-- [The `reffuse` library](packages/reffuse)
-- [`@reffuse/extension-lazyref`, a LazyRef integration for Reffuse](packages/extension-lazyref)
-- [`@reffuse/extension-query`, TanStack Query style hooks for Reffuse](packages/extension-query)
-- [An example project](packges/example)
+- [The `effect-fc` library](packages/effect-fc)
+- [An example project](packages/example)

biome.json

@@ -0,0 +1,40 @@
+{
+  "$schema": "https://biomejs.dev/schemas/latest/schema.json",
+  "vcs": {
+    "enabled": false,
+    "clientKind": "git",
+    "useIgnoreFile": false
+  },
+  "files": {
+    "ignoreUnknown": false
+  },
+  "formatter": {
+    "enabled": false
+  },
+  "linter": {
+    "enabled": true,
+    "rules": {
+      "recommended": true,
+      "style": {
+        "useShorthandFunctionType": "off"
+      },
+      "suspicious": {
+        "noExplicitAny": "off",
+        "noShadowRestrictedNames": "off"
+      }
+    }
+  },
+  "javascript": {
+    "formatter": {
+      "quoteStyle": "double"
+    }
+  },
+  "assist": {
+    "enabled": true,
+    "actions": {
+      "source": {
+        "organizeImports": "on"
+      }
+    }
+  }
+}

bunfig.toml

@@ -1,2 +0,0 @@
-[install.scopes]
-"@thilawyn" = "https://git.valverde.cloud/api/packages/thilawyn/npm/"

package.json

@@ -1,23 +1,26 @@
 {
   "name": "@effect-fc/monorepo",
-  "packageManager": "bun@1.2.13",
+  "packageManager": "bun@1.3.3",
   "private": true,
   "workspaces": [
     "./packages/*"
   ],
   "scripts": {
-    "build": "turbo build --filter=!@effect-fc/example",
+    "build": "turbo build",
     "lint:tsc": "turbo lint:tsc",
-    "pack": "turbo pack --filter=!@effect-fc/example",
-    "publish": "turbo publish --filter=!@effect-fc/example",
-    "clean:cache": "rm -f tsconfig.tsbuildinfo",
-    "clean:dist": "rm -rf dist",
-    "clean:node": "rm -rf node_modules"
+    "lint:biome": "turbo lint:biome",
+    "pack": "turbo pack",
+    "clean:cache": "turbo clean:cache",
+    "clean:dist": "turbo clean:dist",
+    "clean:modules": "turbo clean:modules && rm -rf node_modules"
   },
   "devDependencies": {
-    "npm-check-updates": "^18.0.1",
+    "@biomejs/biome": "^2.3.8",
+    "@effect/language-service": "^0.65.0",
+    "@types/bun": "^1.3.3",
+    "npm-check-updates": "^19.1.2",
     "npm-sort": "^0.0.4",
-    "turbo": "^2.5.3",
-    "typescript": "^5.8.3"
+    "turbo": "^2.6.1",
+    "typescript": "^5.9.3"
   }
 }

packages/effect-fc/README.md

@@ -1,11 +1,64 @@
-# Reffuse
+# Effect FC
 
-[Effect-TS](https://effect.website/) integration for React 19+ with the aim of integrating the Effect context system within React's component hierarchy, while avoiding touching React's internals.
+[Effect-TS](https://effect.website/) integration for React 19+ that allows you to write function components using Effect generators.
 
 This library is in early development. While it is (almost) feature complete and mostly usable, expect bugs and quirks. Things are still being ironed out, so ideas and criticisms are more than welcome.
 
 Documentation is currently being written. In the meantime, you can take a look at the `packages/example` directory.
 
 ## Peer dependencies
-- `effect` 3.13+
+- `effect` 3.15+
 - `react` & `@types/react` 19+
+
+## Known issues
+- React Refresh doesn't work for Effect FC's yet. Page reload is required to view changes. Regular React components are unaffected.
+
+## What writing components looks like
+```typescript
+import { Component } from "effect-fc"
+import { useOnce, useSubscribables } from "effect-fc/Hooks"
+import { Todo } from "./Todo"
+import { TodosState } from "./TodosState.service"
+
+
+export class Todos extends Component.makeUntraced("Todos")(function*() {
+    const state = yield* TodosState
+    const [todos] = yield* useSubscribables(state.ref)
+
+    yield* useOnce(() => Effect.andThen(
+        Console.log("Todos mounted"),
+        Effect.addFinalizer(() => Console.log("Todos unmounted")),
+    ))
+
+    const TodoFC = yield* Todo
+
+    return (
+        <Container>
+            <Heading align="center">Todos</Heading>
+
+            <Flex direction="column" align="stretch" gap="2" mt="2">
+                <TodoFC _tag="new" />
+
+                {Chunk.map(todos, todo =>
+                    <TodoFC key={todo.id} _tag="edit" id={todo.id} />
+                )}
+            </Flex>
+        </Container>
+    )
+}) {}
+
+const TodosStateLive = TodosState.Default("todos")
+
+const Index = Component.makeUntraced("Index")(function*() {
+    const context = yield* useContext(TodosStateLive, { finalizerExecutionMode: "fork" })
+    const TodosFC = yield* Effect.provide(Todos, context)
+
+    return <TodosFC />
+}).pipe(
+    Component.withRuntime(runtime.context)
+)
+
+export const Route = createFileRoute("/")({
+    component: Index
+})
+```

packages/effect-fc/biome.json

@@ -0,0 +1,8 @@
+{
+  "$schema": "https://biomejs.dev/schemas/latest/schema.json",
+  "root": false,
+  "extends": "//",
+  "files": {
+    "includes": ["./src/**"]
+  }
+}

packages/effect-fc/package.json

@@ -1,6 +1,7 @@
 {
   "name": "effect-fc",
-  "version": "0.1.0",
+  "description": "Write React function components with Effect",
+  "version": "0.2.2",
   "type": "module",
   "files": [
     "./README.md",
@@ -16,29 +17,32 @@
       "types": "./dist/index.d.ts",
       "default": "./dist/index.js"
     },
-    "./types": {
-      "types": "./dist/types/index.d.ts",
-      "default": "./dist/types/index.js"
+    "./*": [
+      {
+        "types": "./dist/*/index.d.ts",
+        "default": "./dist/*/index.js"
       },
-    "./*": {
+      {
         "types": "./dist/*.d.ts",
         "default": "./dist/*.js"
       }
+    ]
   },
   "scripts": {
     "build": "tsc",
     "lint:tsc": "tsc --noEmit",
+    "lint:biome": "biome lint",
     "pack": "npm pack",
-    "clean:cache": "rm -f tsconfig.tsbuildinfo",
+    "clean:cache": "rm -rf .turbo tsconfig.tsbuildinfo",
     "clean:dist": "rm -rf dist",
-    "clean:node": "rm -rf node_modules"
-  },
-  "peerDependencies": {
-    "@types/react": "^19.0.0",
-    "effect": "^3.15.0",
-    "react": "^19.0.0"
+    "clean:modules": "rm -rf node_modules"
   },
   "devDependencies": {
-    "@effect/language-service": "^0.23.3"
+    "@effect/platform-browser": "^0.74.0"
+  },
+  "peerDependencies": {
+    "@types/react": "^19.2.0",
+    "effect": "^3.19.0",
+    "react": "^19.2.0"
   }
 }

packages/effect-fc/src/Async.ts

@@ -0,0 +1,85 @@
+/** biome-ignore-all lint/complexity/useArrowFunction: necessary for class prototypes */
+import { Effect, Function, Predicate, Runtime, Scope } from "effect"
+import * as React from "react"
+import * as Component from "./Component.js"
+
+
+export const TypeId: unique symbol = Symbol.for("@effect-fc/Async/Async")
+export type TypeId = typeof TypeId
+
+export interface Async extends Async.Options {
+    readonly [TypeId]: TypeId
+}
+
+export namespace Async {
+    export interface Options {
+        readonly defaultFallback?: React.ReactNode
+    }
+
+    export type Props = Omit<React.SuspenseProps, "children">
+}
+
+
+const AsyncProto = Object.freeze({
+    [TypeId]: TypeId,
+
+    makeFunctionComponent<P extends {}, A extends React.ReactNode, E, R>(
+        this: Component.Component<P, A, E, R> & Async,
+        runtimeRef: React.RefObject<Runtime.Runtime<Exclude<R, Scope.Scope>>>,
+    ) {
+        const SuspenseInner = (props: { readonly promise: Promise<React.ReactNode> }) => React.use(props.promise)
+
+        return ({ fallback, name, ...props }: Async.Props) => {
+            const promise = Runtime.runPromise(runtimeRef.current)(
+                Effect.andThen(
+                    Component.useScope([], this),
+                    scope => Effect.provideService(this.body(props as P), Scope.Scope, scope),
+                )
+            )
+
+            return React.createElement(
+                React.Suspense,
+                { fallback: fallback ?? this.defaultFallback, name },
+                React.createElement(SuspenseInner, { promise }),
+            )
+        }
+    },
+} as const)
+
+
+export const isAsync = (u: unknown): u is Async => Predicate.hasProperty(u, TypeId)
+
+export const async = <T extends Component.Component<any, any, any, any>>(
+    self: T
+): (
+    & Omit<T, keyof Component.Component.AsComponent<T>>
+    & Component.Component<
+        Component.Component.Props<T> & Async.Props,
+        Component.Component.Success<T>,
+        Component.Component.Error<T>,
+        Component.Component.Context<T>
+    >
+    & Async
+) => Object.setPrototypeOf(
+    Object.assign(function() {}, self),
+    Object.freeze(Object.setPrototypeOf(
+        Object.assign({}, AsyncProto),
+        Object.getPrototypeOf(self),
+    )),
+)
+
+export const withOptions: {
+    <T extends Component.Component<any, any, any, any> & Async>(
+        options: Partial<Async.Options>
+    ): (self: T) => T
+    <T extends Component.Component<any, any, any, any> & Async>(
+        self: T,
+        options: Partial<Async.Options>,
+    ): T
+} = Function.dual(2, <T extends Component.Component<any, any, any, any> & Async>(
+    self: T,
+    options: Partial<Async.Options>,
+): T => Object.setPrototypeOf(
+    Object.assign(function() {}, self, options),
+    Object.getPrototypeOf(self),
+))

packages/effect-fc/src/Component.ts

@@ -1,121 +1,533 @@
-import { Context, Effect, ExecutionStrategy, Exit, Function, Pipeable, Ref, Runtime, Scope, String, Tracer, type Types, type Utils } from "effect"
+/** biome-ignore-all lint/complexity/noBannedTypes: {} is the default type for React props */
+/** biome-ignore-all lint/complexity/useArrowFunction: necessary for class prototypes */
+import { Context, type Duration, Effect, Effectable, Equivalence, ExecutionStrategy, Exit, Fiber, Function, HashMap, Layer, ManagedRuntime, Option, Predicate, Ref, Runtime, Scope, Tracer, type Utils } from "effect"
 import * as React from "react"
+import { Memoized } from "./index.js"
 
 
-export interface Component<E, R, P extends {}> extends Pipeable.Pipeable {
-    (props: P): Effect.Effect<React.ReactNode, E, R>
+export const TypeId: unique symbol = Symbol.for("@effect-fc/Component/Component")
+export type TypeId = typeof TypeId
+
+export interface Component<P extends {}, A extends React.ReactNode, E, R>
+extends
+    Effect.Effect<(props: P) => A, never, Exclude<R, Scope.Scope>>,
+    Component.Options
+{
+    new(_: never): Record<string, never>
+    readonly [TypeId]: TypeId
+    readonly "~Props": P
+    readonly "~Success": A
+    readonly "~Error": E
+    readonly "~Context": R
+
+    /** @internal */
+    readonly body: (props: P) => Effect.Effect<A, E, R>
+
+    /** @internal */
+    makeFunctionComponent(
+        runtimeRef: React.Ref<Runtime.Runtime<Exclude<R, Scope.Scope>>>
+    ): (props: P) => A
+}
+
+export declare namespace Component {
+    export type Props<T extends Component<any, any, any, any>> = [T] extends [Component<infer P, infer _A, infer _E, infer _R>] ? P : never
+    export type Success<T extends Component<any, any, any, any>> = [T] extends [Component<infer _P, infer A, infer _E, infer _R>] ? A : never
+    export type Error<T extends Component<any, any, any, any>> = [T] extends [Component<infer _P, infer _A, infer E, infer _R>] ? E : never
+    export type Context<T extends Component<any, any, any, any>> = [T] extends [Component<infer _P, infer _A, infer _E, infer R>] ? R : never
+
+    export type AsComponent<T extends Component<any, any, any, any>> = Component<Props<T>, Success<T>, Error<T>, Context<T>>
+
+    export interface Options {
         readonly displayName?: string
-    readonly options: Options
-}
-
-export interface Options {
-    readonly finalizerExecutionMode: "sync" | "fork"
         readonly finalizerExecutionStrategy: ExecutionStrategy.ExecutionStrategy
-}
-
-export type Error<T> = T extends Component<infer E, infer _R, infer _P> ? E : never
-export type Context<T> = T extends Component<infer _E, infer R, infer _P> ? R : never
-export type Props<T> = T extends Component<infer _E, infer _R, infer P> ? P : never
-
-export const nonReactiveTags = [Tracer.ParentSpan] as const
-
-
-export interface MakeOptions {
-    readonly traced?: boolean
-    readonly finalizerExecutionMode?: "sync" | "fork"
-    readonly finalizerExecutionStrategy?: ExecutionStrategy.ExecutionStrategy
-}
-
-export const make = <
-    Eff extends Utils.YieldWrap<Effect.Effect<any, any, any>>,
-    P extends {} = {},
->(
-    body: (props: P) => Generator<Eff, React.ReactNode, never>,
-    options?: MakeOptions,
-): Component<
-    [Eff] extends [never] ? never : [Eff] extends [Utils.YieldWrap<Effect.Effect<infer _A, infer E, infer _R>>] ? E : never,
-    [Eff] extends [never] ? never : [Eff] extends [Utils.YieldWrap<Effect.Effect<infer _A, infer _E, infer R>>] ? R : never,
-    P
-> => {
-    const displayName = !String.isEmpty(body.name) ? body.name : undefined
-
-    const f = ((options?.traced ?? true)
-        ? displayName
-            ? Effect.fn(displayName)(body)
-            : Effect.fn(body)
-        : Effect.fnUntraced(body)
-    ) as Component<any, any, any>
-
-    f.pipe = function pipe() { return Pipeable.pipeArguments(this, arguments) };
-    (f as Types.Mutable<typeof f>).displayName = displayName;
-    (f as Types.Mutable<typeof f>).options = {
-        finalizerExecutionMode: options?.finalizerExecutionMode ?? "sync",
-        finalizerExecutionStrategy: options?.finalizerExecutionStrategy ?? ExecutionStrategy.sequential,
+        readonly finalizerExecutionDebounce: Duration.DurationInput
     }
-
-    return f
 }
 
 
-export const useFC: {
-    <E, R, P extends {}>(
-        self: Component<E, R, P>
-    ): Effect.Effect<React.FC<P>, never, Exclude<R, Scope.Scope>>
-} = Effect.fn("useFC")(function* <E, R, P extends {}>(
-    self: Component<E, R, P>
-) {
+const ComponentProto = Object.freeze({
+    ...Effectable.CommitPrototype,
+    [TypeId]: TypeId,
+
+    commit: Effect.fnUntraced(function* <P extends {}, A extends React.ReactNode, E, R>(
+        this: Component<P, A, E, R>
+    ) {
+        // biome-ignore lint/style/noNonNullAssertion: React ref initialization
         const runtimeRef = React.useRef<Runtime.Runtime<Exclude<R, Scope.Scope>>>(null!)
         runtimeRef.current = yield* Effect.runtime<Exclude<R, Scope.Scope>>()
 
-    return React.useMemo(() => function ScopeProvider(props: P) {
-        const scope = useScope(runtimeRef.current, self.options)
-
-        const FC = React.useMemo(() => {
-            const f = (props: P) => Runtime.runSync(runtimeRef.current)(
-                Effect.provideService(self(props), Scope.Scope, scope)
-            )
-            f.displayName = self.displayName ?? "Anonymous"
-            return f
-        }, [scope])
-
-        return React.createElement(FC, props)
-    }, Array.from(
+        return yield* React.useState(() => Runtime.runSync(runtimeRef.current)(Effect.cachedFunction(
+            (_services: readonly any[]) => Effect.sync(() => {
+                const f: React.FC<P> = this.makeFunctionComponent(runtimeRef)
+                f.displayName = this.displayName ?? "Anonymous"
+                return Memoized.isMemoized(this)
+                    ? React.memo(f, this.propsAreEqual)
+                    : f
+            }),
+            Equivalence.array(Equivalence.strict()),
+        )))[0](Array.from(
             Context.omit(...nonReactiveTags)(runtimeRef.current.context).unsafeMap.values()
         ))
-})
+    }),
 
-const useScope = (
-    runtime: Runtime.Runtime<never>,
-    options: Options,
-) => {
-    const [isInitialRun, initialScope] = React.useMemo(() => Runtime.runSync(runtime)(
-        Effect.all([Ref.make(true), Scope.make(options.finalizerExecutionStrategy)])
-    ), [])
-    const [scope, setScope] = React.useState(initialScope)
+    makeFunctionComponent<P extends {}, A extends React.ReactNode, E, R>(
+        this: Component<P, A, E, R>,
+        runtimeRef: React.RefObject<Runtime.Runtime<Exclude<R, Scope.Scope>>>,
+    ) {
+        return (props: P) => Runtime.runSync(runtimeRef.current)(
+            Effect.andThen(
+                useScope([], this),
+                scope => Effect.provideService(this.body(props), Scope.Scope, scope),
+            )
+        )
+    },
+} as const)
 
-    React.useEffect(() => Runtime.runSync(runtime)(
-        Effect.if(isInitialRun, {
-            onTrue: () => Effect.as(
-                Ref.set(isInitialRun, false),
-                () => closeScope(scope, runtime, options),
-            ),
-
-            onFalse: () => Scope.make(options.finalizerExecutionStrategy).pipe(
-                Effect.tap(scope => Effect.sync(() => setScope(scope))),
-                Effect.map(scope => () => closeScope(scope, runtime, options)),
-            ),
-        })
-    ), [])
-
-    return scope
+const defaultOptions: Component.Options = {
+    finalizerExecutionStrategy: ExecutionStrategy.sequential,
+    finalizerExecutionDebounce: "100 millis",
 }
 
-const closeScope = (
-    scope: Scope.CloseableScope,
-    runtime: Runtime.Runtime<never>,
-    options: Options,
-) => {
-    switch (options.finalizerExecutionMode) {
+const nonReactiveTags = [Tracer.ParentSpan] as const
+
+
+export const isComponent = (u: unknown): u is Component<{}, React.ReactNode, unknown, unknown> => Predicate.hasProperty(u, TypeId)
+
+export declare namespace make {
+    export type Gen = {
+        <Eff extends Utils.YieldWrap<Effect.Effect<any, any, any>>, A extends React.ReactNode, P extends {} = {}>(
+            body: (props: P) => Generator<Eff, A, never>
+        ): Component<
+            P, A,
+            [Eff] extends [never] ? never : [Eff] extends [Utils.YieldWrap<Effect.Effect<infer _A, infer E, infer _R>>] ? E : never,
+            [Eff] extends [never] ? never : [Eff] extends [Utils.YieldWrap<Effect.Effect<infer _A, infer _E, infer R>>] ? R : never
+        >
+        <Eff extends Utils.YieldWrap<Effect.Effect<any, any, any>>, A, B extends Effect.Effect<React.ReactNode, any, any>, P extends {} = {}>(
+            body: (props: P) => Generator<Eff, A, never>,
+            a: (
+                _: Effect.Effect<
+                    A,
+                    [Eff] extends [never] ? never : [Eff] extends [Utils.YieldWrap<Effect.Effect<infer _A, infer E, infer _R>>] ? E : never,
+                    [Eff] extends [never] ? never : [Eff] extends [Utils.YieldWrap<Effect.Effect<infer _A, infer _E, infer R>>] ? R : never
+                >,
+                props: NoInfer<P>,
+            ) => B,
+        ): Component<P, Effect.Effect.Success<Effect.Effect.AsEffect<B>>, Effect.Effect.Error<B>, Effect.Effect.Context<B>>
+        <Eff extends Utils.YieldWrap<Effect.Effect<any, any, any>>, A, B, C extends Effect.Effect<React.ReactNode, any, any>, P extends {} = {}>(
+            body: (props: P) => Generator<Eff, A, never>,
+            a: (
+                _: Effect.Effect<
+                    A,
+                    [Eff] extends [never] ? never : [Eff] extends [Utils.YieldWrap<Effect.Effect<infer _A, infer E, infer _R>>] ? E : never,
+                    [Eff] extends [never] ? never : [Eff] extends [Utils.YieldWrap<Effect.Effect<infer _A, infer _E, infer R>>] ? R : never
+                >,
+                props: NoInfer<P>,
+            ) => B,
+            b: (_: B, props: NoInfer<P>) => C,
+        ): Component<P, Effect.Effect.Success<Effect.Effect.AsEffect<C>>, Effect.Effect.Error<C>, Effect.Effect.Context<C>>
+        <Eff extends Utils.YieldWrap<Effect.Effect<any, any, any>>, A, B, C, D extends Effect.Effect<React.ReactNode, any, any>, P extends {} = {}>(
+            body: (props: P) => Generator<Eff, A, never>,
+            a: (
+                _: Effect.Effect<
+                    A,
+                    [Eff] extends [never] ? never : [Eff] extends [Utils.YieldWrap<Effect.Effect<infer _A, infer E, infer _R>>] ? E : never,
+                    [Eff] extends [never] ? never : [Eff] extends [Utils.YieldWrap<Effect.Effect<infer _A, infer _E, infer R>>] ? R : never
+                >,
+                props: NoInfer<P>,
+            ) => B,
+            b: (_: B, props: NoInfer<P>) => C,
+            c: (_: C, props: NoInfer<P>) => D,
+        ): Component<P, Effect.Effect.Success<Effect.Effect.AsEffect<D>>, Effect.Effect.Error<D>, Effect.Effect.Context<D>>
+        <Eff extends Utils.YieldWrap<Effect.Effect<any, any, any>>, A, B, C, D, E extends Effect.Effect<React.ReactNode, any, any>, P extends {} = {}>(
+            body: (props: P) => Generator<Eff, A, never>,
+            a: (
+                _: Effect.Effect<
+                    A,
+                    [Eff] extends [never] ? never : [Eff] extends [Utils.YieldWrap<Effect.Effect<infer _A, infer E, infer _R>>] ? E : never,
+                    [Eff] extends [never] ? never : [Eff] extends [Utils.YieldWrap<Effect.Effect<infer _A, infer _E, infer R>>] ? R : never
+                >,
+                props: NoInfer<P>,
+            ) => B,
+            b: (_: B, props: NoInfer<P>) => C,
+            c: (_: C, props: NoInfer<P>) => D,
+            d: (_: D, props: NoInfer<P>) => E,
+        ): Component<P, Effect.Effect.Success<Effect.Effect.AsEffect<E>>, Effect.Effect.Error<E>, Effect.Effect.Context<E>>
+        <Eff extends Utils.YieldWrap<Effect.Effect<any, any, any>>, A, B, C, D, E, F extends Effect.Effect<React.ReactNode, any, any>, P extends {} = {}>(
+            body: (props: P) => Generator<Eff, A, never>,
+            a: (
+                _: Effect.Effect<
+                    A,
+                    [Eff] extends [never] ? never : [Eff] extends [Utils.YieldWrap<Effect.Effect<infer _A, infer E, infer _R>>] ? E : never,
+                    [Eff] extends [never] ? never : [Eff] extends [Utils.YieldWrap<Effect.Effect<infer _A, infer _E, infer R>>] ? R : never
+                >,
+                props: NoInfer<P>,
+            ) => B,
+            b: (_: B, props: NoInfer<P>) => C,
+            c: (_: C, props: NoInfer<P>) => D,
+            d: (_: D, props: NoInfer<P>) => E,
+            e: (_: E, props: NoInfer<P>) => F,
+        ): Component<P, Effect.Effect.Success<Effect.Effect.AsEffect<F>>, Effect.Effect.Error<F>, Effect.Effect.Context<F>>
+        <Eff extends Utils.YieldWrap<Effect.Effect<any, any, any>>, A, B, C, D, E, F, G extends Effect.Effect<React.ReactNode, any, any>, P extends {} = {}>(
+            body: (props: P) => Generator<Eff, A, never>,
+            a: (
+                _: Effect.Effect<
+                    A,
+                    [Eff] extends [never] ? never : [Eff] extends [Utils.YieldWrap<Effect.Effect<infer _A, infer E, infer _R>>] ? E : never,
+                    [Eff] extends [never] ? never : [Eff] extends [Utils.YieldWrap<Effect.Effect<infer _A, infer _E, infer R>>] ? R : never
+                >,
+                props: NoInfer<P>,
+            ) => B,
+            b: (_: B, props: NoInfer<P>) => C,
+            c: (_: C, props: NoInfer<P>) => D,
+            d: (_: D, props: NoInfer<P>) => E,
+            e: (_: E, props: NoInfer<P>) => F,
+            f: (_: F, props: NoInfer<P>) => G,
+        ): Component<P, Effect.Effect.Success<Effect.Effect.AsEffect<G>>, Effect.Effect.Error<G>, Effect.Effect.Context<G>>
+        <Eff extends Utils.YieldWrap<Effect.Effect<any, any, any>>, A, B, C, D, E, F, G, H extends Effect.Effect<React.ReactNode, any, any>, P extends {} = {}>(
+            body: (props: P) => Generator<Eff, A, never>,
+            a: (
+                _: Effect.Effect<
+                    A,
+                    [Eff] extends [never] ? never : [Eff] extends [Utils.YieldWrap<Effect.Effect<infer _A, infer E, infer _R>>] ? E : never,
+                    [Eff] extends [never] ? never : [Eff] extends [Utils.YieldWrap<Effect.Effect<infer _A, infer _E, infer R>>] ? R : never
+                >,
+                props: NoInfer<P>,
+            ) => B,
+            b: (_: B, props: NoInfer<P>) => C,
+            c: (_: C, props: NoInfer<P>) => D,
+            d: (_: D, props: NoInfer<P>) => E,
+            e: (_: E, props: NoInfer<P>) => F,
+            f: (_: F, props: NoInfer<P>) => G,
+            g: (_: G, props: NoInfer<P>) => H,
+        ): Component<P, Effect.Effect.Success<Effect.Effect.AsEffect<H>>, Effect.Effect.Error<H>, Effect.Effect.Context<H>>
+        <Eff extends Utils.YieldWrap<Effect.Effect<any, any, any>>, A, B, C, D, E, F, G, H, I extends Effect.Effect<React.ReactNode, any, any>, P extends {} = {}>(
+            body: (props: P) => Generator<Eff, A, never>,
+            a: (
+                _: Effect.Effect<
+                    A,
+                    [Eff] extends [never] ? never : [Eff] extends [Utils.YieldWrap<Effect.Effect<infer _A, infer E, infer _R>>] ? E : never,
+                    [Eff] extends [never] ? never : [Eff] extends [Utils.YieldWrap<Effect.Effect<infer _A, infer _E, infer R>>] ? R : never
+                >,
+                props: NoInfer<P>,
+            ) => B,
+            b: (_: B, props: NoInfer<P>) => C,
+            c: (_: C, props: NoInfer<P>) => D,
+            d: (_: D, props: NoInfer<P>) => E,
+            e: (_: E, props: NoInfer<P>) => F,
+            f: (_: F, props: NoInfer<P>) => G,
+            g: (_: G, props: NoInfer<P>) => H,
+            h: (_: H, props: NoInfer<P>) => I,
+        ): Component<P, Effect.Effect.Success<Effect.Effect.AsEffect<I>>, Effect.Effect.Error<I>, Effect.Effect.Context<I>>
+        <Eff extends Utils.YieldWrap<Effect.Effect<any, any, any>>, A, B, C, D, E, F, G, H, I, J extends Effect.Effect<React.ReactNode, any, any>, P extends {} = {}>(
+            body: (props: P) => Generator<Eff, A, never>,
+            a: (
+                _: Effect.Effect<
+                    A,
+                    [Eff] extends [never] ? never : [Eff] extends [Utils.YieldWrap<Effect.Effect<infer _A, infer E, infer _R>>] ? E : never,
+                    [Eff] extends [never] ? never : [Eff] extends [Utils.YieldWrap<Effect.Effect<infer _A, infer _E, infer R>>] ? R : never
+                >,
+                props: NoInfer<P>,
+            ) => B,
+            b: (_: B, props: NoInfer<P>) => C,
+            c: (_: C, props: NoInfer<P>) => D,
+            d: (_: D, props: NoInfer<P>) => E,
+            e: (_: E, props: NoInfer<P>) => F,
+            f: (_: F, props: NoInfer<P>) => G,
+            g: (_: G, props: NoInfer<P>) => H,
+            h: (_: H, props: NoInfer<P>) => I,
+            i: (_: I, props: NoInfer<P>) => J,
+        ): Component<P, Effect.Effect.Success<Effect.Effect.AsEffect<J>>, Effect.Effect.Error<J>, Effect.Effect.Context<J>>
+    }
+
+    export type NonGen = {
+        <Eff extends Effect.Effect<React.ReactNode, any, any>, P extends {} = {}>(
+            body: (props: P) => Eff
+        ): Component<P, Effect.Effect.Success<Effect.Effect.AsEffect<Eff>>, Effect.Effect.Error<Eff>, Effect.Effect.Context<Eff>>
+        <Eff extends Effect.Effect<React.ReactNode, any, any>, A, P extends {} = {}>(
+            body: (props: P) => A,
+            a: (_: A, props: NoInfer<P>) => Eff,
+        ): Component<P, Effect.Effect.Success<Effect.Effect.AsEffect<Eff>>, Effect.Effect.Error<Eff>, Effect.Effect.Context<Eff>>
+        <Eff extends Effect.Effect<React.ReactNode, any, any>, A, B, P extends {} = {}>(
+            body: (props: P) => A,
+            a: (_: A, props: NoInfer<P>) => B,
+            b: (_: B, props: NoInfer<P>) => Eff,
+        ): Component<P, Effect.Effect.Success<Effect.Effect.AsEffect<Eff>>, Effect.Effect.Error<Eff>, Effect.Effect.Context<Eff>>
+        <Eff extends Effect.Effect<React.ReactNode, any, any>, A, B, C, P extends {} = {}>(
+            body: (props: P) => A,
+            a: (_: A, props: NoInfer<P>) => B,
+            b: (_: B, props: NoInfer<P>) => C,
+            c: (_: C, props: NoInfer<P>) => Eff,
+        ): Component<P, Effect.Effect.Success<Effect.Effect.AsEffect<Eff>>, Effect.Effect.Error<Eff>, Effect.Effect.Context<Eff>>
+        <Eff extends Effect.Effect<React.ReactNode, any, any>, A, B, C, D, P extends {} = {}>(
+            body: (props: P) => A,
+            a: (_: A, props: NoInfer<P>) => B,
+            b: (_: B, props: NoInfer<P>) => C,
+            c: (_: C, props: NoInfer<P>) => D,
+            d: (_: D, props: NoInfer<P>) => Eff,
+        ): Component<P, Effect.Effect.Success<Effect.Effect.AsEffect<Eff>>, Effect.Effect.Error<Eff>, Effect.Effect.Context<Eff>>
+        <Eff extends Effect.Effect<React.ReactNode, any, any>, A, B, C, D, E, P extends {} = {}>(
+            body: (props: P) => A,
+            a: (_: A, props: NoInfer<P>) => B,
+            b: (_: B, props: NoInfer<P>) => C,
+            c: (_: C, props: NoInfer<P>) => D,
+            d: (_: D, props: NoInfer<P>) => E,
+            e: (_: E, props: NoInfer<P>) => Eff,
+        ): Component<P, Effect.Effect.Success<Effect.Effect.AsEffect<Eff>>, Effect.Effect.Error<Eff>, Effect.Effect.Context<Eff>>
+        <Eff extends Effect.Effect<React.ReactNode, any, any>, A, B, C, D, E, F, P extends {} = {}>(
+            body: (props: P) => A,
+            a: (_: A, props: NoInfer<P>) => B,
+            b: (_: B, props: NoInfer<P>) => C,
+            c: (_: C, props: NoInfer<P>) => D,
+            d: (_: D, props: NoInfer<P>) => E,
+            e: (_: E, props: NoInfer<P>) => F,
+            f: (_: F, props: NoInfer<P>) => Eff,
+        ): Component<P, Effect.Effect.Success<Effect.Effect.AsEffect<Eff>>, Effect.Effect.Error<Eff>, Effect.Effect.Context<Eff>>
+        <Eff extends Effect.Effect<React.ReactNode, any, any>, A, B, C, D, E, F, G, P extends {} = {}>(
+            body: (props: P) => A,
+            a: (_: A, props: NoInfer<P>) => B,
+            b: (_: B, props: NoInfer<P>) => C,
+            c: (_: C, props: NoInfer<P>) => D,
+            d: (_: D, props: NoInfer<P>) => E,
+            e: (_: E, props: NoInfer<P>) => F,
+            f: (_: F, props: NoInfer<P>) => G,
+            g: (_: G, props: NoInfer<P>) => Eff,
+        ): Component<P, Effect.Effect.Success<Effect.Effect.AsEffect<Eff>>, Effect.Effect.Error<Eff>, Effect.Effect.Context<Eff>>
+        <Eff extends Effect.Effect<React.ReactNode, any, any>, A, B, C, D, E, F, G, H, P extends {} = {}>(
+            body: (props: P) => A,
+            a: (_: A, props: NoInfer<P>) => B,
+            b: (_: B, props: NoInfer<P>) => C,
+            c: (_: C, props: NoInfer<P>) => D,
+            d: (_: D, props: NoInfer<P>) => E,
+            e: (_: E, props: NoInfer<P>) => F,
+            f: (_: F, props: NoInfer<P>) => G,
+            g: (_: G, props: NoInfer<P>) => H,
+            h: (_: H, props: NoInfer<P>) => Eff,
+        ): Component<P, Effect.Effect.Success<Effect.Effect.AsEffect<Eff>>, Effect.Effect.Error<Eff>, Effect.Effect.Context<Eff>>
+        <Eff extends Effect.Effect<React.ReactNode, any, any>, A, B, C, D, E, F, G, H, I, P extends {} = {}>(
+            body: (props: P) => A,
+            a: (_: A, props: NoInfer<P>) => B,
+            b: (_: B, props: NoInfer<P>) => C,
+            c: (_: C, props: NoInfer<P>) => D,
+            d: (_: D, props: NoInfer<P>) => E,
+            e: (_: E, props: NoInfer<P>) => F,
+            f: (_: F, props: NoInfer<P>) => G,
+            g: (_: G, props: NoInfer<P>) => H,
+            h: (_: H, props: NoInfer<P>) => I,
+            i: (_: I, props: NoInfer<P>) => Eff,
+        ): Component<P, Effect.Effect.Success<Effect.Effect.AsEffect<Eff>>, Effect.Effect.Error<Eff>, Effect.Effect.Context<Eff>>
+    }
+}
+
+export const make: (
+    & make.Gen
+    & make.NonGen
+    & ((
+        spanName: string,
+        spanOptions?: Tracer.SpanOptions,
+    ) => make.Gen & make.NonGen)
+) = (spanNameOrBody: Function | string, ...pipeables: any[]): any => {
+    if (typeof spanNameOrBody !== "string") {
+        return Object.setPrototypeOf(
+            Object.assign(function() {}, defaultOptions, {
+                body: Effect.fn(spanNameOrBody as any, ...pipeables),
+            }),
+            ComponentProto,
+        )
+    }
+    else {
+        const spanOptions = pipeables[0]
+        return (body: any, ...pipeables: any[]) => Object.setPrototypeOf(
+            Object.assign(function() {}, defaultOptions, {
+                body: Effect.fn(spanNameOrBody, spanOptions)(body, ...pipeables as []),
+                displayName: spanNameOrBody,
+            }),
+            ComponentProto,
+        )
+    }
+}
+
+export const makeUntraced: (
+    & make.Gen
+    & make.NonGen
+    & ((name: string) => make.Gen & make.NonGen)
+) = (spanNameOrBody: Function | string, ...pipeables: any[]): any => (
+    typeof spanNameOrBody !== "string"
+        ? Object.setPrototypeOf(
+            Object.assign(function() {}, defaultOptions, {
+                body: Effect.fnUntraced(spanNameOrBody as any, ...pipeables as []),
+            }),
+            ComponentProto,
+        )
+        : (body: any, ...pipeables: any[]) => Object.setPrototypeOf(
+            Object.assign(function() {}, defaultOptions, {
+                body: Effect.fnUntraced(body, ...pipeables as []),
+                displayName: spanNameOrBody,
+            }),
+            ComponentProto,
+        )
+)
+
+export const withOptions: {
+    <T extends Component<any, any, any, any>>(
+        options: Partial<Component.Options>
+    ): (self: T) => T
+    <T extends Component<any, any, any, any>>(
+        self: T,
+        options: Partial<Component.Options>,
+    ): T
+} = Function.dual(2, <T extends Component<any, any, any, any>>(
+    self: T,
+    options: Partial<Component.Options>,
+): T => Object.setPrototypeOf(
+    Object.assign(function() {}, self, options),
+    Object.getPrototypeOf(self),
+))
+
+export const withRuntime: {
+    <P extends {}, A extends React.ReactNode, E, R>(
+        context: React.Context<Runtime.Runtime<R>>,
+    ): (self: Component<P, A, E, Scope.Scope | NoInfer<R>>) => (props: P) => A
+    <P extends {}, A extends React.ReactNode, E, R>(
+        self: Component<P, A, E, Scope.Scope | NoInfer<R>>,
+        context: React.Context<Runtime.Runtime<R>>,
+    ): (props: P) => A
+} = Function.dual(2, <P extends {}, A extends React.ReactNode, E, R>(
+    self: Component<P, A, E, R>,
+    context: React.Context<Runtime.Runtime<R>>,
+) => function WithRuntime(props: P) {
+    return React.createElement(
+        Runtime.runSync(React.useContext(context))(self),
+        props,
+    )
+})
+
+
+export class ScopeMap extends Effect.Service<ScopeMap>()("@effect-fc/Component/ScopeMap", {
+    effect: Effect.bind(Effect.Do, "ref", () => Ref.make(HashMap.empty<object, ScopeMap.Entry>()))
+}) {}
+
+export declare namespace ScopeMap {
+    export interface Entry {
+        readonly scope: Scope.CloseableScope
+        readonly closeFiber: Option.Option<Fiber.RuntimeFiber<void>>
+    }
+}
+
+
+export declare namespace useScope {
+    export interface Options {
+        readonly finalizerExecutionStrategy?: ExecutionStrategy.ExecutionStrategy
+        readonly finalizerExecutionDebounce?: Duration.DurationInput
+    }
+}
+
+export const useScope = Effect.fnUntraced(function*(
+    deps: React.DependencyList,
+    options?: useScope.Options,
+): Effect.fn.Return<Scope.Scope> {
+    // biome-ignore lint/style/noNonNullAssertion: context initialization
+    const runtimeRef = React.useRef<Runtime.Runtime<never>>(null!)
+    runtimeRef.current = yield* Effect.runtime()
+
+    const scopeMap = yield* ScopeMap as unknown as Effect.Effect<ScopeMap>
+
+    const [key, scope] = React.useMemo(() => Runtime.runSync(runtimeRef.current)(Effect.andThen(
+        Effect.all([Effect.succeed({}), scopeMap.ref]),
+        ([key, map]) => Effect.andThen(
+            Option.match(HashMap.get(map, key), {
+                onSome: entry => Effect.succeed(entry.scope),
+                onNone: () => Effect.tap(
+                    Scope.make(options?.finalizerExecutionStrategy ?? defaultOptions.finalizerExecutionStrategy),
+                    scope => Ref.update(scopeMap.ref, HashMap.set(key, {
+                        scope,
+                        closeFiber: Option.none(),
+                    })),
+                ),
+            }),
+            scope => [key, scope] as const,
+        ),
+    // biome-ignore lint/correctness/useExhaustiveDependencies: use of React.DependencyList
+    )), deps)
+
+    // biome-ignore lint/correctness/useExhaustiveDependencies: only reactive on "key"
+    React.useEffect(() => Runtime.runSync(runtimeRef.current)(scopeMap.ref.pipe(
+        Effect.andThen(HashMap.get(key)),
+        Effect.tap(entry => Option.match(entry.closeFiber, {
+            onSome: fiber => Effect.andThen(
+                Ref.update(scopeMap.ref, HashMap.set(key, { ...entry, closeFiber: Option.none() })),
+                Fiber.interruptFork(fiber),
+            ),
+            onNone: () => Effect.void,
+        })),
+        Effect.map(({ scope }) =>
+            () => Runtime.runSync(runtimeRef.current)(Effect.andThen(
+                Effect.forkDaemon(Effect.sleep(options?.finalizerExecutionDebounce ?? defaultOptions.finalizerExecutionDebounce).pipe(
+                    Effect.andThen(Scope.close(scope, Exit.void)),
+                    Effect.andThen(Ref.update(scopeMap.ref, HashMap.remove(key))),
+                )),
+                fiber => Ref.update(scopeMap.ref, HashMap.set(key, {
+                    scope,
+                    closeFiber: Option.some(fiber),
+                })),
+            ))
+        ),
+    )), [key])
+
+    return scope
+})
+
+export const useOnMount = Effect.fnUntraced(function* <A, E, R>(
+    f: () => Effect.Effect<A, E, R>
+): Effect.fn.Return<A, E, R> {
+    const runtime = yield* Effect.runtime<R>()
+    return yield* React.useState(() => Runtime.runSync(runtime)(Effect.cached(f())))[0]
+})
+
+export declare namespace useOnChange {
+    export interface Options extends useScope.Options {}
+}
+
+export const useOnChange = Effect.fnUntraced(function* <A, E, R>(
+    f: () => Effect.Effect<A, E, R>,
+    deps: React.DependencyList,
+    options?: useOnChange.Options,
+): Effect.fn.Return<A, E, Exclude<R, Scope.Scope>> {
+    const runtime = yield* Effect.runtime<Exclude<R, Scope.Scope>>()
+    const scope = yield* useScope(deps, options)
+
+    // biome-ignore lint/correctness/useExhaustiveDependencies: only reactive on "scope"
+    return yield* React.useMemo(() => Runtime.runSync(runtime)(
+        Effect.cached(Effect.provideService(f(), Scope.Scope, scope))
+    ), [scope])
+})
+
+export declare namespace useReactEffect {
+    export interface Options {
+        readonly finalizerExecutionMode?: "sync" | "fork"
+        readonly finalizerExecutionStrategy?: ExecutionStrategy.ExecutionStrategy
+    }
+}
+
+export const useReactEffect = Effect.fnUntraced(function* <E, R>(
+    f: () => Effect.Effect<void, E, R>,
+    deps?: React.DependencyList,
+    options?: useReactEffect.Options,
+): Effect.fn.Return<void, never, Exclude<R, Scope.Scope>> {
+    const runtime = yield* Effect.runtime<Exclude<R, Scope.Scope>>()
+    // biome-ignore lint/correctness/useExhaustiveDependencies: use of React.DependencyList
+    React.useEffect(() => runReactEffect(runtime, f, options), deps)
+})
+
+const runReactEffect = <E, R>(
+    runtime: Runtime.Runtime<Exclude<R, Scope.Scope>>,
+    f: () => Effect.Effect<void, E, R>,
+    options?: useReactEffect.Options,
+) => Effect.Do.pipe(
+    Effect.bind("scope", () => Scope.make(options?.finalizerExecutionStrategy ?? defaultOptions.finalizerExecutionStrategy)),
+    Effect.bind("exit", ({ scope }) => Effect.exit(Effect.provideService(f(), Scope.Scope, scope))),
+    Effect.map(({ scope }) =>
+        () => {
+            switch (options?.finalizerExecutionMode ?? "fork") {
                 case "sync":
                     Runtime.runSync(runtime)(Scope.close(scope, Exit.void))
                     break
@@ -123,30 +535,71 @@ const closeScope = (
                     Runtime.runFork(runtime)(Scope.close(scope, Exit.void))
                     break
             }
+        }
+    ),
+    Runtime.runSync(runtime),
+)
+
+export declare namespace useReactLayoutEffect {
+    export interface Options extends useReactEffect.Options {}
 }
 
-
-export const use: {
-    <E, R, P extends {}>(
-        self: Component<E, R, P>,
-        fn: (Component: React.FC<P>) => React.ReactNode,
-    ): Effect.Effect<React.ReactNode, never, Exclude<R, Scope.Scope>>
-} = Effect.fn("use")(function*(self, fn) {
-    return fn(yield* useFC(self))
+export const useReactLayoutEffect = Effect.fnUntraced(function* <E, R>(
+    f: () => Effect.Effect<void, E, R>,
+    deps?: React.DependencyList,
+    options?: useReactLayoutEffect.Options,
+): Effect.fn.Return<void, never, Exclude<R, Scope.Scope>> {
+    const runtime = yield* Effect.runtime<Exclude<R, Scope.Scope>>()
+    // biome-ignore lint/correctness/useExhaustiveDependencies: use of React.DependencyList
+    React.useLayoutEffect(() => runReactEffect(runtime, f, options), deps)
 })
 
-export const withRuntime: {
-    <E, R, P extends {}>(
-        context: React.Context<Runtime.Runtime<R>>,
-    ): (self: Component<E, R | Scope.Scope, P>) => React.FC<P>
-    <E, R, P extends {}>(
-        self: Component<E, R | Scope.Scope, P>,
-        context: React.Context<Runtime.Runtime<R>>,
-    ): React.FC<P>
-} = Function.dual(2, <E, R, P extends {}>(
-    self: Component<E, R | Scope.Scope, P>,
-    context: React.Context<Runtime.Runtime<R>>,
-): React.FC<P> => function WithRuntime(props) {
-    const runtime = React.useContext(context)
-    return React.createElement(Runtime.runSync(runtime)(useFC(self)), props)
+export const useRunSync = <R = never>(): Effect.Effect<
+    <A, E = never>(effect: Effect.Effect<A, E, Scope.Scope | R>) => A,
+    never,
+    Scope.Scope | R
+> => Effect.andThen(Effect.runtime(), Runtime.runSync)
+
+export const useRunPromise = <R = never>(): Effect.Effect<
+    <A, E = never>(effect: Effect.Effect<A, E, Scope.Scope | R>) => Promise<A>,
+    never,
+    Scope.Scope | R
+> => Effect.andThen(Effect.runtime(), context => Runtime.runPromise(context))
+
+export const useCallbackSync = Effect.fnUntraced(function* <Args extends unknown[], A, E, R>(
+    f: (...args: Args) => Effect.Effect<A, E, R>,
+    deps: React.DependencyList,
+): Effect.fn.Return<(...args: Args) => A, never, R> {
+    // biome-ignore lint/style/noNonNullAssertion: context initialization
+    const runtimeRef = React.useRef<Runtime.Runtime<R>>(null!)
+    runtimeRef.current = yield* Effect.runtime<R>()
+
+    // biome-ignore lint/correctness/useExhaustiveDependencies: use of React.DependencyList
+    return React.useCallback((...args: Args) => Runtime.runSync(runtimeRef.current)(f(...args)), deps)
 })
+
+export const useCallbackPromise = Effect.fnUntraced(function* <Args extends unknown[], A, E, R>(
+    f: (...args: Args) => Effect.Effect<A, E, R>,
+    deps: React.DependencyList,
+): Effect.fn.Return<(...args: Args) => Promise<A>, never, R> {
+    // biome-ignore lint/style/noNonNullAssertion: context initialization
+    const runtimeRef = React.useRef<Runtime.Runtime<R>>(null!)
+    runtimeRef.current = yield* Effect.runtime<R>()
+
+    // biome-ignore lint/correctness/useExhaustiveDependencies: use of React.DependencyList
+    return React.useCallback((...args: Args) => Runtime.runPromise(runtimeRef.current)(f(...args)), deps)
+})
+
+export declare namespace useContext {
+    export interface Options extends useOnChange.Options {}
+}
+
+export const useContext = <ROut, E, RIn>(
+    layer: Layer.Layer<ROut, E, RIn>,
+    options?: useContext.Options,
+): Effect.Effect<Context.Context<ROut>, E, Scope.Scope | RIn> => useOnChange(() => Effect.context<RIn>().pipe(
+    Effect.map(context => ManagedRuntime.make(Layer.provide(layer, Layer.succeedContext(context)))),
+    Effect.tap(runtime => Effect.addFinalizer(() => runtime.disposeEffect)),
+    Effect.andThen(runtime => runtime.runtimeEffect),
+    Effect.andThen(runtime => runtime.context),
+), [layer], options)

packages/effect-fc/src/ErrorObserver.ts

@@ -0,0 +1,62 @@
+import { type Cause, Context, Effect, Exit, Layer, Option, Pipeable, Predicate, PubSub, type Queue, type Scope, Supervisor } from "effect"
+
+
+export const TypeId: unique symbol = Symbol.for("@effect-fc/ErrorObserver/ErrorObserver")
+export type TypeId = typeof TypeId
+
+export interface ErrorObserver<in out E = never> extends Pipeable.Pipeable {
+    readonly [TypeId]: TypeId
+    handle<A, E, R>(effect: Effect.Effect<A, E, R>): Effect.Effect<A, E, R>
+    readonly subscribe: Effect.Effect<Queue.Dequeue<Cause.Cause<E>>, never, Scope.Scope>
+}
+
+export const ErrorObserver = <E = never>(): Context.Tag<ErrorObserver, ErrorObserver<E>> => Context.GenericTag("@effect-fc/ErrorObserver/ErrorObserver")
+
+class ErrorObserverImpl<in out E = never>
+extends Pipeable.Class() implements ErrorObserver<E> {
+    readonly [TypeId]: TypeId = TypeId
+    readonly subscribe: Effect.Effect<Queue.Dequeue<Cause.Cause<E>>, never, Scope.Scope>
+
+    constructor(
+        readonly pubsub: PubSub.PubSub<Cause.Cause<E>>
+    ) {
+        super()
+        this.subscribe = pubsub.subscribe
+    }
+
+    handle<A, EffE, R>(effect: Effect.Effect<A, EffE, R>): Effect.Effect<A, EffE, R> {
+        return Effect.tapErrorCause(effect, cause => PubSub.publish(this.pubsub, cause as Cause.Cause<E>))
+    }
+}
+
+class ErrorObserverSupervisorImpl extends Supervisor.AbstractSupervisor<void> {
+    readonly value = Effect.void
+    constructor(readonly pubsub: PubSub.PubSub<Cause.Cause<never>>) {
+        super()
+    }
+
+    onEnd<A, E>(_value: Exit.Exit<A, E>): void {
+        if (Exit.isFailure(_value)) {
+            Effect.runSync(PubSub.publish(this.pubsub, _value.cause as Cause.Cause<never>))
+        }
+    }
+}
+
+
+export const isErrorObserver = (u: unknown): u is ErrorObserver<unknown> => Predicate.hasProperty(u, TypeId)
+
+export const layer: Layer.Layer<ErrorObserver> = Layer.unwrapEffect(Effect.map(
+    PubSub.unbounded<Cause.Cause<never>>(),
+    pubsub => Layer.merge(
+        Supervisor.addSupervisor(new ErrorObserverSupervisorImpl(pubsub)),
+        Layer.succeed(ErrorObserver(), new ErrorObserverImpl(pubsub)),
+    ),
+))
+
+export const handle = <A, E, R>(effect: Effect.Effect<A, E, R>): Effect.Effect<A, E, R> => Effect.andThen(
+    Effect.serviceOption(ErrorObserver()),
+    Option.match({
+        onSome: observer => observer.handle(effect),
+        onNone: () => effect,
+    }),
+)

packages/effect-fc/src/Form.ts

@@ -0,0 +1,396 @@
+import { Array, Cause, Chunk, type Context, type Duration, Effect, Equal, Exit, Fiber, flow, Hash, HashMap, identity, Option, ParseResult, Pipeable, Predicate, Ref, Schema, type Scope, Stream } from "effect"
+import type * as React from "react"
+import * as Component from "./Component.js"
+import * as Mutation from "./Mutation.js"
+import * as PropertyPath from "./PropertyPath.js"
+import * as Result from "./Result.js"
+import * as Subscribable from "./Subscribable.js"
+import * as SubscriptionRef from "./SubscriptionRef.js"
+import * as SubscriptionSubRef from "./SubscriptionSubRef.js"
+
+
+export const FormTypeId: unique symbol = Symbol.for("@effect-fc/Form/Form")
+export type FormTypeId = typeof FormTypeId
+
+export interface Form<in out A, in out I = A, in out R = never, in out MA = void, in out ME = never, in out MR = never, in out MP = never>
+extends Pipeable.Pipeable {
+    readonly [FormTypeId]: FormTypeId
+
+    readonly schema: Schema.Schema<A, I, R>
+    readonly context: Context.Context<Scope.Scope | R>
+    readonly mutation: Mutation.Mutation<
+        readonly [value: A, form: Form<A, I, R, unknown, unknown, unknown>],
+        MA, ME, MR, MP
+    >
+    readonly autosubmit: boolean
+    readonly debounce: Option.Option<Duration.DurationInput>
+
+    readonly value: Subscribable.Subscribable<Option.Option<A>>
+    readonly encodedValue: SubscriptionRef.SubscriptionRef<I>
+    readonly error: Subscribable.Subscribable<Option.Option<ParseResult.ParseError>>
+    readonly validationFiber: Subscribable.Subscribable<Option.Option<Fiber.Fiber<A, ParseResult.ParseError>>>
+
+    readonly canSubmit: Subscribable.Subscribable<boolean>
+
+    field<const P extends PropertyPath.Paths<I>>(
+        path: P
+    ): Effect.Effect<FormField<PropertyPath.ValueFromPath<A, P>, PropertyPath.ValueFromPath<I, P>>>
+
+    readonly run: Effect.Effect<void>
+    readonly submit: Effect.Effect<Option.Option<Result.Final<MA, ME, MP>>, Cause.NoSuchElementException>
+}
+
+export class FormImpl<in out A, in out I = A, in out R = never, in out MA = void, in out ME = never, in out MR = never, in out MP = never>
+extends Pipeable.Class() implements Form<A, I, R, MA, ME, MR, MP> {
+    readonly [FormTypeId]: FormTypeId = FormTypeId
+
+    constructor(
+        readonly schema: Schema.Schema<A, I, R>,
+        readonly context: Context.Context<Scope.Scope | R>,
+        readonly mutation: Mutation.Mutation<
+            readonly [value: A, form: Form<A, I, R, unknown, unknown, unknown>],
+            MA, ME, MR, MP
+        >,
+        readonly autosubmit: boolean,
+        readonly debounce: Option.Option<Duration.DurationInput>,
+
+        readonly value: SubscriptionRef.SubscriptionRef<Option.Option<A>>,
+        readonly encodedValue: SubscriptionRef.SubscriptionRef<I>,
+        readonly error: SubscriptionRef.SubscriptionRef<Option.Option<ParseResult.ParseError>>,
+        readonly validationFiber: SubscriptionRef.SubscriptionRef<Option.Option<Fiber.Fiber<A, ParseResult.ParseError>>>,
+
+        readonly runSemaphore: Effect.Semaphore,
+        readonly fieldCache: Ref.Ref<HashMap.HashMap<FormFieldKey, FormField<unknown, unknown>>>,
+    ) {
+        super()
+
+        this.canSubmit = Subscribable.map(
+            Subscribable.zipLatestAll(this.value, this.error, this.validationFiber, this.mutation.result),
+            ([value, error, validationFiber, result]) => (
+                Option.isSome(value) &&
+                Option.isNone(error) &&
+                Option.isNone(validationFiber) &&
+                !(Result.isRunning(result) || Result.hasRefreshingFlag(result))
+            ),
+        )
+    }
+
+    field<const P extends PropertyPath.Paths<I>>(
+        path: P
+    ): Effect.Effect<FormField<PropertyPath.ValueFromPath<A, P>, PropertyPath.ValueFromPath<I, P>>> {
+        const key = new FormFieldKey(path)
+        return this.fieldCache.pipe(
+            Effect.map(HashMap.get(key)),
+            Effect.flatMap(Option.match({
+                onSome: v => Effect.succeed(v as FormField<PropertyPath.ValueFromPath<A, P>, PropertyPath.ValueFromPath<I, P>>),
+                onNone: () => Effect.tap(
+                    Effect.succeed(makeFormField(this as Form<A, I, R, MA, ME, MR, MP>, path)),
+                    v => Ref.update(this.fieldCache, HashMap.set(key, v as FormField<unknown, unknown>)),
+                ),
+            })),
+        )
+    }
+
+    readonly canSubmit: Subscribable.Subscribable<boolean>
+
+    get run(): Effect.Effect<void> {
+        return this.runSemaphore.withPermits(1)(Stream.runForEach(
+            this.encodedValue.changes.pipe(
+                Option.isSome(this.debounce) ? Stream.debounce(this.debounce.value) : identity
+            ),
+
+            encodedValue => this.validationFiber.pipe(
+                Effect.andThen(Option.match({
+                    onSome: Fiber.interrupt,
+                    onNone: () => Effect.void,
+                })),
+                Effect.andThen(
+                    Effect.forkScoped(Effect.onExit(
+                        Schema.decode(this.schema, { errors: "all" })(encodedValue),
+                        exit => Effect.andThen(
+                            Exit.matchEffect(exit, {
+                                onSuccess: v => Effect.andThen(
+                                    Ref.set(this.value, Option.some(v)),
+                                    Ref.set(this.error, Option.none()),
+                                ),
+                                onFailure: c => Option.match(Chunk.findFirst(Cause.failures(c), e => e._tag === "ParseError"), {
+                                    onSome: e => Ref.set(this.error, Option.some(e)),
+                                    onNone: () => Effect.void,
+                                }),
+                            }),
+                            Ref.set(this.validationFiber, Option.none()),
+                        ),
+                    )).pipe(
+                        Effect.tap(fiber => Ref.set(this.validationFiber, Option.some(fiber))),
+                        Effect.andThen(Fiber.join),
+                        Effect.andThen(value => this.autosubmit
+                            ? Effect.asVoid(Effect.forkScoped(this.submitValue(value)))
+                            : Effect.void
+                        ),
+                        Effect.forkScoped,
+                    )
+                ),
+                Effect.provide(this.context),
+            ),
+        ))
+    }
+
+    get submit(): Effect.Effect<Option.Option<Result.Final<MA, ME, MP>>, Cause.NoSuchElementException> {
+        return this.value.pipe(
+            Effect.andThen(identity),
+            Effect.andThen(value => this.submitValue(value)),
+        )
+    }
+
+    submitValue(value: A): Effect.Effect<Option.Option<Result.Final<MA, ME, MP>>> {
+        return Effect.whenEffect(
+            Effect.tap(
+                this.mutation.mutate([value, this as any]),
+                result => Result.isFailure(result)
+                    ? Option.match(
+                        Chunk.findFirst(
+                            Cause.failures(result.cause as Cause.Cause<ParseResult.ParseError>),
+                            e => e._tag === "ParseError",
+                        ),
+                        {
+                            onSome: e => Ref.set(this.error, Option.some(e)),
+                            onNone: () => Effect.void,
+                        },
+                    )
+                    : Effect.void
+            ),
+            this.canSubmit.get,
+        )
+    }
+}
+
+export const isForm = (u: unknown): u is Form<unknown, unknown, unknown, unknown, unknown, unknown> => Predicate.hasProperty(u, FormTypeId)
+
+export declare namespace make {
+    export interface Options<in out A, in out I = A, in out R = never, in out MA = void, in out ME = never, in out MR = never, in out MP = never>
+    extends Mutation.make.Options<
+        readonly [value: NoInfer<A>, form: Form<NoInfer<A>, NoInfer<I>, NoInfer<R>, unknown, unknown, unknown>],
+        MA, ME, MR, MP
+    > {
+        readonly schema: Schema.Schema<A, I, R>
+        readonly initialEncodedValue: NoInfer<I>
+        readonly autosubmit?: boolean
+        readonly debounce?: Duration.DurationInput
+    }
+}
+
+export const make = Effect.fnUntraced(function* <A, I = A, R = never, MA = void, ME = never, MR = never, MP = never>(
+    options: make.Options<A, I, R, MA, ME, MR, MP>
+): Effect.fn.Return<
+    Form<A, I, R, MA, ME, Result.forkEffect.OutputContext<MA, ME, MR, MP>, MP>,
+    never,
+    Scope.Scope | R | Result.forkEffect.OutputContext<MA, ME, MR, MP>
+> {
+    return new FormImpl(
+        options.schema,
+        yield* Effect.context<Scope.Scope | R>(),
+        yield* Mutation.make(options),
+        options.autosubmit ?? false,
+        Option.fromNullable(options.debounce),
+
+        yield* SubscriptionRef.make(Option.none<A>()),
+        yield* SubscriptionRef.make(options.initialEncodedValue),
+        yield* SubscriptionRef.make(Option.none<ParseResult.ParseError>()),
+        yield* SubscriptionRef.make(Option.none<Fiber.Fiber<A, ParseResult.ParseError>>()),
+
+        yield* Effect.makeSemaphore(1),
+        yield* Ref.make(HashMap.empty<FormFieldKey, FormField<unknown, unknown>>()),
+    )
+})
+
+export declare namespace service {
+    export interface Options<in out A, in out I = A, in out R = never, in out MA = void, in out ME = never, in out MR = never, in out MP = never>
+    extends make.Options<A, I, R, MA, ME, MR, MP> {}
+}
+
+export const service = <A, I = A, R = never, MA = void, ME = never, MR = never, MP = never>(
+    options: service.Options<A, I, R, MA, ME, MR, MP>
+): Effect.Effect<
+    Form<A, I, R, MA, ME, Result.forkEffect.OutputContext<MA, ME, MR, MP>, MP>,
+    never,
+    Scope.Scope | R | Result.forkEffect.OutputContext<MA, ME, MR, MP>
+> => Effect.tap(
+    make(options),
+    form => Effect.forkScoped(form.run),
+)
+
+
+export const FormFieldTypeId: unique symbol = Symbol.for("@effect-fc/Form/FormField")
+export type FormFieldTypeId = typeof FormFieldTypeId
+
+export interface FormField<in out A, in out I = A>
+extends Pipeable.Pipeable {
+    readonly [FormFieldTypeId]: FormFieldTypeId
+
+    readonly value: Subscribable.Subscribable<Option.Option<A>, Cause.NoSuchElementException>
+    readonly encodedValue: SubscriptionRef.SubscriptionRef<I>
+    readonly issues: Subscribable.Subscribable<readonly ParseResult.ArrayFormatterIssue[]>
+    readonly isValidating: Subscribable.Subscribable<boolean>
+    readonly isSubmitting: Subscribable.Subscribable<boolean>
+}
+
+class FormFieldImpl<in out A, in out I = A>
+extends Pipeable.Class() implements FormField<A, I> {
+    readonly [FormFieldTypeId]: FormFieldTypeId = FormFieldTypeId
+
+    constructor(
+        readonly value: Subscribable.Subscribable<Option.Option<A>, Cause.NoSuchElementException>,
+        readonly encodedValue: SubscriptionRef.SubscriptionRef<I>,
+        readonly issues: Subscribable.Subscribable<readonly ParseResult.ArrayFormatterIssue[]>,
+        readonly isValidating: Subscribable.Subscribable<boolean>,
+        readonly isSubmitting: Subscribable.Subscribable<boolean>,
+    ) {
+        super()
+    }
+}
+
+const FormFieldKeyTypeId: unique symbol = Symbol.for("@effect-fc/Form/FormFieldKey")
+type FormFieldKeyTypeId = typeof FormFieldKeyTypeId
+
+class FormFieldKey implements Equal.Equal {
+    readonly [FormFieldKeyTypeId]: FormFieldKeyTypeId = FormFieldKeyTypeId
+    constructor(readonly path: PropertyPath.PropertyPath) {}
+
+    [Equal.symbol](that: Equal.Equal) {
+        return isFormFieldKey(that) && PropertyPath.equivalence(this.path, that.path)
+    }
+    [Hash.symbol]() {
+        return Hash.array(this.path)
+    }
+}
+
+export const isFormField = (u: unknown): u is FormField<unknown, unknown> => Predicate.hasProperty(u, FormFieldTypeId)
+const isFormFieldKey = (u: unknown): u is FormFieldKey => Predicate.hasProperty(u, FormFieldKeyTypeId)
+
+export const makeFormField = <A, I, R, MA, ME, MR, MP, const P extends PropertyPath.Paths<NoInfer<I>>>(
+    self: Form<A, I, R, MA, ME, MR, MP>,
+    path: P,
+): FormField<PropertyPath.ValueFromPath<A, P>, PropertyPath.ValueFromPath<I, P>> => {
+    return new FormFieldImpl(
+        Subscribable.mapEffect(self.value, Option.match({
+            onSome: v => Option.map(PropertyPath.get(v, path), Option.some),
+            onNone: () => Option.some(Option.none()),
+        })),
+        SubscriptionSubRef.makeFromPath(self.encodedValue, path),
+        Subscribable.mapEffect(self.error, Option.match({
+            onSome: flow(
+                ParseResult.ArrayFormatter.formatError,
+                Effect.map(Array.filter(issue => PropertyPath.equivalence(issue.path, path))),
+            ),
+            onNone: () => Effect.succeed([]),
+        })),
+        Subscribable.map(self.validationFiber, Option.isSome),
+        Subscribable.map(self.mutation.result, result => Result.isRunning(result) || Result.hasRefreshingFlag(result)),
+    )
+}
+
+
+export namespace useInput {
+    export interface Options {
+        readonly debounce?: Duration.DurationInput
+    }
+
+    export interface Success<T> {
+        readonly value: T
+        readonly setValue: React.Dispatch<React.SetStateAction<T>>
+    }
+}
+
+export const useInput = Effect.fnUntraced(function* <A, I>(
+    field: FormField<A, I>,
+    options?: useInput.Options,
+): Effect.fn.Return<useInput.Success<I>, Cause.NoSuchElementException, Scope.Scope> {
+    const internalValueRef = yield* Component.useOnChange(() => Effect.tap(
+        Effect.andThen(field.encodedValue, SubscriptionRef.make),
+        internalValueRef => Effect.forkScoped(Effect.all([
+            Stream.runForEach(
+                Stream.drop(field.encodedValue, 1),
+                upstreamEncodedValue => Effect.whenEffect(
+                    Ref.set(internalValueRef, upstreamEncodedValue),
+                    Effect.andThen(internalValueRef, internalValue => !Equal.equals(upstreamEncodedValue, internalValue)),
+                ),
+            ),
+
+            Stream.runForEach(
+                internalValueRef.changes.pipe(
+                    Stream.drop(1),
+                    Stream.changesWith(Equal.equivalence()),
+                    options?.debounce ? Stream.debounce(options.debounce) : identity,
+                ),
+                internalValue => Ref.set(field.encodedValue, internalValue),
+            ),
+        ], { concurrency: "unbounded" })),
+    ), [field, options?.debounce])
+
+    const [value, setValue] = yield* SubscriptionRef.useSubscriptionRefState(internalValueRef)
+    return { value, setValue }
+})
+
+export namespace useOptionalInput {
+    export interface Options<T> extends useInput.Options {
+        readonly defaultValue: T
+    }
+
+    export interface Success<T> extends useInput.Success<T> {
+        readonly enabled: boolean
+        readonly setEnabled: React.Dispatch<React.SetStateAction<boolean>>
+    }
+}
+
+export const useOptionalInput = Effect.fnUntraced(function* <A, I>(
+    field: FormField<A, Option.Option<I>>,
+    options: useOptionalInput.Options<I>,
+): Effect.fn.Return<useOptionalInput.Success<I>, Cause.NoSuchElementException, Scope.Scope> {
+    const [enabledRef, internalValueRef] = yield* Component.useOnChange(() => Effect.tap(
+        Effect.andThen(
+            field.encodedValue,
+            Option.match({
+                onSome: v => Effect.all([SubscriptionRef.make(true), SubscriptionRef.make(v)]),
+                onNone: () => Effect.all([SubscriptionRef.make(false), SubscriptionRef.make(options.defaultValue)]),
+            }),
+        ),
+
+        ([enabledRef, internalValueRef]) => Effect.forkScoped(Effect.all([
+            Stream.runForEach(
+                Stream.drop(field.encodedValue, 1),
+
+                upstreamEncodedValue => Effect.whenEffect(
+                    Option.match(upstreamEncodedValue, {
+                        onSome: v => Effect.andThen(
+                            Ref.set(enabledRef, true),
+                            Ref.set(internalValueRef, v),
+                        ),
+                        onNone: () => Effect.andThen(
+                            Ref.set(enabledRef, false),
+                            Ref.set(internalValueRef, options.defaultValue),
+                        ),
+                    }),
+
+                    Effect.andThen(
+                        Effect.all([enabledRef, internalValueRef]),
+                        ([enabled, internalValue]) => !Equal.equals(upstreamEncodedValue, enabled ? Option.some(internalValue) : Option.none()),
+                    ),
+                ),
+            ),
+
+            Stream.runForEach(
+                enabledRef.changes.pipe(
+                    Stream.zipLatest(internalValueRef.changes),
+                    Stream.drop(1),
+                    Stream.changesWith(Equal.equivalence()),
+                    options?.debounce ? Stream.debounce(options.debounce) : identity,
+                ),
+                ([enabled, internalValue]) => Ref.set(field.encodedValue, enabled ? Option.some(internalValue) : Option.none()),
+            ),
+        ], { concurrency: "unbounded" })),
+    ), [field, options.debounce])
+
+    const [enabled, setEnabled] = yield* SubscriptionRef.useSubscriptionRefState(enabledRef)
+    const [value, setValue] = yield* SubscriptionRef.useSubscriptionRefState(internalValueRef)
+    return { enabled, setEnabled, value, setValue }
+})

packages/effect-fc/src/Hook.ts

@@ -1,273 +0,0 @@
-import { type Context, Effect, ExecutionStrategy, Exit, type Layer, Option, pipe, PubSub, Ref, Runtime, Scope, Stream, SubscriptionRef } from "effect"
-import * as React from "react"
-import { SetStateAction } from "./types/index.js"
-
-
-export interface ScopeOptions {
-    readonly finalizerExecutionMode?: "sync" | "fork"
-    readonly finalizerExecutionStrategy?: ExecutionStrategy.ExecutionStrategy
-}
-
-
-export const useMemo: {
-    <A, E, R>(
-        factory: () => Effect.Effect<A, E, R>,
-        deps: React.DependencyList,
-    ): Effect.Effect<A, E, R>
-} = Effect.fn("useMemo")(function* <A, E, R>(
-    factory: () => Effect.Effect<A, E, R>,
-    deps: React.DependencyList,
-) {
-    const runtime = yield* Effect.runtime()
-    return yield* React.useMemo(() => Runtime.runSync(runtime)(Effect.cached(factory())), deps)
-})
-
-export const useOnce: {
-    <A, E, R>(factory: () => Effect.Effect<A, E, R>): Effect.Effect<A, E, R>
-} = Effect.fn("useOnce")(function* <A, E, R>(
-    factory: () => Effect.Effect<A, E, R>
-) {
-    return yield* useMemo(factory, [])
-})
-
-export const useMemoLayer: {
-    <ROut, E, RIn>(
-        layer: Layer.Layer<ROut, E, RIn>
-    ): Effect.Effect<Context.Context<ROut>, E, RIn>
-} = Effect.fn("useMemoLayer")(function* <ROut, E, RIn>(
-    layer: Layer.Layer<ROut, E, RIn>
-) {
-    return yield* useMemo(() => Effect.provide(Effect.context<ROut>(), layer), [layer])
-})
-
-
-export const useCallbackSync: {
-    <Args extends unknown[], A, E, R>(
-        callback: (...args: Args) => Effect.Effect<A, E, R>,
-        deps: React.DependencyList,
-    ): Effect.Effect<(...args: Args) => A, never, R>
-} = Effect.fn("useCallbackSync")(function* <Args extends unknown[], A, E, R>(
-    callback: (...args: Args) => Effect.Effect<A, E, R>,
-    deps: React.DependencyList,
-) {
-    const runtime = yield* Effect.runtime<R>()
-    return React.useCallback((...args: Args) => Runtime.runSync(runtime)(callback(...args)), deps)
-})
-
-export const useCallbackPromise: {
-    <Args extends unknown[], A, E, R>(
-        callback: (...args: Args) => Effect.Effect<A, E, R>,
-        deps: React.DependencyList,
-    ): Effect.Effect<(...args: Args) => Promise<A>, never, R>
-} = Effect.fn("useCallbackPromise")(function* <Args extends unknown[], A, E, R>(
-    callback: (...args: Args) => Effect.Effect<A, E, R>,
-    deps: React.DependencyList,
-) {
-    const runtime = yield* Effect.runtime<R>()
-    return React.useCallback((...args: Args) => Runtime.runPromise(runtime)(callback(...args)), deps)
-})
-
-
-export const useEffect: {
-    <E, R>(
-        effect: () => Effect.Effect<void, E, R>,
-        deps?: React.DependencyList,
-        options?: ScopeOptions,
-    ): Effect.Effect<void, never, Exclude<R, Scope.Scope>>
-} = Effect.fn("useEffect")(function* <E, R>(
-    effect: () => Effect.Effect<void, E, R>,
-    deps?: React.DependencyList,
-    options?: ScopeOptions,
-) {
-    const runtime = yield* Effect.runtime<Exclude<R, Scope.Scope>>()
-
-    React.useEffect(() => {
-        const { scope, exit } = Effect.Do.pipe(
-            Effect.bind("scope", () => Scope.make(options?.finalizerExecutionStrategy ?? ExecutionStrategy.sequential)),
-            Effect.bind("exit", ({ scope }) => Effect.exit(Effect.provideService(effect(), Scope.Scope, scope))),
-            Runtime.runSync(runtime),
-        )
-
-        return () => {
-            switch (options?.finalizerExecutionMode ?? "sync") {
-                case "sync":
-                    Runtime.runSync(runtime)(Scope.close(scope, exit))
-                    break
-                case "fork":
-                    Runtime.runFork(runtime)(Scope.close(scope, exit))
-                    break
-            }
-        }
-    }, deps)
-})
-
-export const useLayoutEffect: {
-    <E, R>(
-        effect: () => Effect.Effect<void, E, R>,
-        deps?: React.DependencyList,
-        options?: ScopeOptions,
-    ): Effect.Effect<void, never, Exclude<R, Scope.Scope>>
-} = Effect.fn("useLayoutEffect")(function* <E, R>(
-    effect: () => Effect.Effect<void, E, R>,
-    deps?: React.DependencyList,
-    options?: ScopeOptions,
-) {
-    const runtime = yield* Effect.runtime<Exclude<R, Scope.Scope>>()
-
-    React.useLayoutEffect(() => {
-        const { scope, exit } = Effect.Do.pipe(
-            Effect.bind("scope", () => Scope.make(options?.finalizerExecutionStrategy ?? ExecutionStrategy.sequential)),
-            Effect.bind("exit", ({ scope }) => Effect.exit(Effect.provideService(effect(), Scope.Scope, scope))),
-            Runtime.runSync(runtime),
-        )
-
-        return () => {
-            switch (options?.finalizerExecutionMode ?? "sync") {
-                case "sync":
-                    Runtime.runSync(runtime)(Scope.close(scope, exit))
-                    break
-                case "fork":
-                    Runtime.runFork(runtime)(Scope.close(scope, exit))
-                    break
-            }
-        }
-    }, deps)
-})
-
-export const useFork: {
-    <E, R>(
-        effect: () => Effect.Effect<void, E, R>,
-        deps?: React.DependencyList,
-        options?: Runtime.RunForkOptions & ScopeOptions,
-    ): Effect.Effect<void, never, Exclude<R, Scope.Scope>>
-} = Effect.fn("useFork")(function* <E, R>(
-    effect: () => Effect.Effect<void, E, R>,
-    deps?: React.DependencyList,
-    options?: Runtime.RunForkOptions & ScopeOptions,
-) {
-    const runtime = yield* Effect.runtime<Exclude<R, Scope.Scope>>()
-
-    React.useEffect(() => {
-        const scope = Runtime.runSync(runtime)(options?.scope
-            ? Scope.fork(options.scope, options?.finalizerExecutionStrategy ?? ExecutionStrategy.sequential)
-            : Scope.make(options?.finalizerExecutionStrategy)
-        )
-        Runtime.runFork(runtime)(Effect.provideService(effect(), Scope.Scope, scope), { ...options, scope })
-
-        return () => {
-            switch (options?.finalizerExecutionMode ?? "fork") {
-                case "sync":
-                    Runtime.runSync(runtime)(Scope.close(scope, Exit.void))
-                    break
-                case "fork":
-                    Runtime.runFork(runtime)(Scope.close(scope, Exit.void))
-                    break
-            }
-        }
-    }, deps)
-})
-
-
-export const useRefFromReactiveValue: {
-    <A>(value: A): Effect.Effect<SubscriptionRef.SubscriptionRef<A>>
-} = Effect.fn("useRefFromReactiveValue")(function*(value) {
-    const ref = yield* useOnce(() => SubscriptionRef.make(value))
-    yield* useEffect(() => Ref.set(ref, value), [value])
-    return ref
-})
-
-export const useSubscribeRefs: {
-    <const Refs extends readonly SubscriptionRef.SubscriptionRef<any>[]>(
-        ...refs: Refs
-    ): Effect.Effect<{ [K in keyof Refs]: Effect.Effect.Success<Refs[K]> }>
-} = Effect.fn("useSubscribeRefs")(function* <const Refs extends readonly SubscriptionRef.SubscriptionRef<any>[]>(
-    ...refs: Refs
-) {
-    const [reactStateValue, setReactStateValue] = React.useState(yield* useOnce(() =>
-        Effect.all(refs as readonly SubscriptionRef.SubscriptionRef<any>[])
-    ))
-
-    yield* useFork(() => pipe(
-        refs.map(ref => Stream.changesWith(ref.changes, (x, y) => x === y)),
-        streams => Stream.zipLatestAll(...streams),
-        Stream.runForEach(v =>
-            Effect.sync(() => setReactStateValue(v))
-        ),
-    ), refs)
-
-    return reactStateValue as any
-})
-
-export const useRefState: {
-    <A>(
-        ref: SubscriptionRef.SubscriptionRef<A>
-    ): Effect.Effect<readonly [A, React.Dispatch<React.SetStateAction<A>>]>
-} = Effect.fn("useRefState")(function* <A>(ref: SubscriptionRef.SubscriptionRef<A>) {
-    const [reactStateValue, setReactStateValue] = React.useState(yield* useOnce(() => ref))
-
-    yield* useFork(() => Stream.runForEach(
-        Stream.changesWith(ref.changes, (x, y) => x === y),
-        v => Effect.sync(() => setReactStateValue(v)),
-    ), [ref])
-
-    const setValue = yield* useCallbackSync((setStateAction: React.SetStateAction<A>) =>
-        Ref.update(ref, prevState =>
-            SetStateAction.value(setStateAction, prevState)
-        ),
-    [ref])
-
-    return [reactStateValue, setValue]
-})
-
-
-export const useStreamFromReactiveValues: {
-    <const A extends React.DependencyList>(
-        values: A
-    ): Effect.Effect<Stream.Stream<A>, never, Scope.Scope>
-} = Effect.fn("useStreamFromReactiveValues")(function* <const A extends React.DependencyList>(values: A) {
-    const { latest, pubsub, stream } = yield* useOnce(() => Effect.Do.pipe(
-        Effect.bind("latest", () => Ref.make(values)),
-        Effect.bind("pubsub", () => Effect.acquireRelease(PubSub.unbounded<A>(), PubSub.shutdown)),
-        Effect.let("stream", ({ latest, pubsub }) => latest.pipe(
-            Effect.flatMap(a => Effect.map(
-                Stream.fromPubSub(pubsub, { scoped: true }),
-                s => Stream.concat(Stream.make(a), s),
-            )),
-            Stream.unwrapScoped,
-        )),
-    ))
-
-    yield* useEffect(() => Ref.set(latest, values).pipe(
-        Effect.andThen(PubSub.publish(pubsub, values)),
-        Effect.unlessEffect(PubSub.isShutdown(pubsub)),
-    ), values)
-
-    return stream
-})
-
-export const useSubscribeStream: {
-    <A, E, R>(
-        stream: Stream.Stream<A, E, R>
-    ): Effect.Effect<Option.Option<A>, never, R>
-    <A extends NonNullable<unknown>, E, R>(
-        stream: Stream.Stream<A, E, R>,
-        initialValue: A,
-    ): Effect.Effect<Option.Some<A>, never, R>
-} = Effect.fn("useSubscribeStream")(function* <A extends NonNullable<unknown>, E, R>(
-    stream: Stream.Stream<A, E, R>,
-    initialValue?: A,
-) {
-    const [reactStateValue, setReactStateValue] = React.useState(
-        React.useMemo(() => initialValue
-            ? Option.some(initialValue)
-            : Option.none(),
-        [])
-    )
-
-    yield* useFork(() => Stream.runForEach(
-        Stream.changesWith(stream, (x, y) => x === y),
-        v => Effect.sync(() => setReactStateValue(Option.some(v))),
-    ), [stream])
-
-    return reactStateValue as Option.Some<A>
-})

packages/effect-fc/src/Memoized.ts

@@ -0,0 +1,51 @@
+/** biome-ignore-all lint/complexity/useArrowFunction: necessary for class prototypes */
+import { type Equivalence, Function, Predicate } from "effect"
+import type * as Component from "./Component.js"
+
+
+export const TypeId: unique symbol = Symbol.for("@effect-fc/Memoized/Memoized")
+export type TypeId = typeof TypeId
+
+export interface Memoized<P> extends Memoized.Options<P> {
+    readonly [TypeId]: TypeId
+}
+
+export namespace Memoized {
+    export interface Options<P> {
+        readonly propsAreEqual?: Equivalence.Equivalence<P>
+    }
+}
+
+
+const MemoizedProto = Object.freeze({
+    [TypeId]: TypeId
+} as const)
+
+
+export const isMemoized = (u: unknown): u is Memoized<unknown> => Predicate.hasProperty(u, TypeId)
+
+export const memoized = <T extends Component.Component<any, any, any, any>>(
+    self: T
+): T & Memoized<Component.Component.Props<T>> => Object.setPrototypeOf(
+    Object.assign(function() {}, self),
+    Object.freeze(Object.setPrototypeOf(
+        Object.assign({}, MemoizedProto),
+        Object.getPrototypeOf(self),
+    )),
+)
+
+export const withOptions: {
+    <T extends Component.Component<any, any, any, any> & Memoized<any>>(
+        options: Partial<Memoized.Options<Component.Component.Props<T>>>
+    ): (self: T) => T
+    <T extends Component.Component<any, any, any, any> & Memoized<any>>(
+        self: T,
+        options: Partial<Memoized.Options<Component.Component.Props<T>>>,
+    ): T
+} = Function.dual(2, <T extends Component.Component<any, any, any, any> & Memoized<any>>(
+    self: T,
+    options: Partial<Memoized.Options<Component.Component.Props<T>>>,
+): T => Object.setPrototypeOf(
+    Object.assign(function() {}, self, options),
+    Object.getPrototypeOf(self),
+))

packages/effect-fc/src/Mutation.ts

@@ -0,0 +1,128 @@
+import { type Context, Effect, Equal, type Fiber, Option, Pipeable, Predicate, type Scope, Stream, type Subscribable, SubscriptionRef } from "effect"
+import * as Result from "./Result.js"
+
+
+export const MutationTypeId: unique symbol = Symbol.for("@effect-fc/Mutation/Mutation")
+export type MutationTypeId = typeof MutationTypeId
+
+export interface Mutation<in out K extends Mutation.AnyKey, in out A, in out E = never, in out R = never, in out P = never>
+extends Pipeable.Pipeable {
+    readonly [MutationTypeId]: MutationTypeId
+
+    readonly context: Context.Context<Scope.Scope | R>
+    readonly f: (key: K) => Effect.Effect<A, E, R>
+    readonly initialProgress: P
+
+    readonly latestKey: Subscribable.Subscribable<Option.Option<K>>
+    readonly fiber: Subscribable.Subscribable<Option.Option<Fiber.Fiber<A, E>>>
+    readonly result: Subscribable.Subscribable<Result.Result<A, E, P>>
+    readonly latestFinalResult: Subscribable.Subscribable<Option.Option<Result.Final<A, E, P>>>
+
+    mutate(key: K): Effect.Effect<Result.Final<A, E, P>>
+    mutateSubscribable(key: K): Effect.Effect<Subscribable.Subscribable<Result.Result<A, E, P>>>
+}
+
+export declare namespace Mutation {
+    export type AnyKey = readonly any[]
+}
+
+export class MutationImpl<in out K extends Mutation.AnyKey, in out A, in out E = never, in out R = never, in out P = never>
+extends Pipeable.Class() implements Mutation<K, A, E, R, P> {
+    readonly [MutationTypeId]: MutationTypeId = MutationTypeId
+
+    constructor(
+        readonly context: Context.Context<Scope.Scope | R>,
+        readonly f: (key: K) => Effect.Effect<A, E, R>,
+        readonly initialProgress: P,
+
+        readonly latestKey: SubscriptionRef.SubscriptionRef<Option.Option<K>>,
+        readonly fiber: SubscriptionRef.SubscriptionRef<Option.Option<Fiber.Fiber<A, E>>>,
+        readonly result: SubscriptionRef.SubscriptionRef<Result.Result<A, E, P>>,
+        readonly latestFinalResult: SubscriptionRef.SubscriptionRef<Option.Option<Result.Final<A, E, P>>>,
+    ) {
+        super()
+    }
+
+    mutate(key: K): Effect.Effect<Result.Final<A, E, P>> {
+        return SubscriptionRef.set(this.latestKey, Option.some(key)).pipe(
+            Effect.andThen(this.start(key)),
+            Effect.andThen(sub => this.watch(sub)),
+            Effect.provide(this.context),
+        )
+    }
+    mutateSubscribable(key: K): Effect.Effect<Subscribable.Subscribable<Result.Result<A, E, P>>> {
+        return SubscriptionRef.set(this.latestKey, Option.some(key)).pipe(
+            Effect.andThen(this.start(key)),
+            Effect.tap(sub => Effect.forkScoped(this.watch(sub))),
+            Effect.provide(this.context),
+        )
+    }
+
+    start(key: K): Effect.Effect<
+        Subscribable.Subscribable<Result.Result<A, E, P>>,
+        never,
+        Scope.Scope | R
+    > {
+        return this.latestFinalResult.pipe(
+            Effect.andThen(initial => Result.unsafeForkEffect(
+                Effect.onExit(this.f(key), () => Effect.andThen(
+                    Effect.all([Effect.fiberId, this.fiber]),
+                    ([currentFiberId, fiber]) => Option.match(fiber, {
+                        onSome: v => Equal.equals(currentFiberId, v.id())
+                            ? SubscriptionRef.set(this.fiber, Option.none())
+                            : Effect.void,
+                        onNone: () => Effect.void,
+                    }),
+                )),
+
+                {
+                    initial: Option.isSome(initial) ? Result.willFetch(initial.value) : Result.initial(),
+                    initialProgress: this.initialProgress,
+                } as Result.unsafeForkEffect.Options<A, E, P>,
+            )),
+            Effect.tap(([, fiber]) => SubscriptionRef.set(this.fiber, Option.some(fiber))),
+            Effect.map(([sub]) => sub),
+        )
+    }
+
+    watch(
+        sub: Subscribable.Subscribable<Result.Result<A, E, P>>
+    ): Effect.Effect<Result.Final<A, E, P>> {
+        return sub.get.pipe(
+            Effect.andThen(initial => Stream.runFoldEffect(
+                sub.changes,
+                initial,
+                (_, result) => Effect.as(SubscriptionRef.set(this.result, result), result),
+            ) as Effect.Effect<Result.Final<A, E, P>>),
+            Effect.tap(result => SubscriptionRef.set(this.latestFinalResult, Option.some(result))),
+        )
+    }
+}
+
+export const isMutation = (u: unknown): u is Mutation<readonly unknown[], unknown, unknown, unknown, unknown> => Predicate.hasProperty(u, MutationTypeId)
+
+export declare namespace make {
+    export interface Options<K extends Mutation.AnyKey = never, A = void, E = never, R = never, P = never> {
+        readonly f: (key: K) => Effect.Effect<A, E, Result.forkEffect.InputContext<R, NoInfer<P>>>
+        readonly initialProgress?: P
+    }
+}
+
+export const make = Effect.fnUntraced(function* <const K extends Mutation.AnyKey = never, A = void, E = never, R = never, P = never>(
+    options: make.Options<K, A, E, R, P>
+): Effect.fn.Return<
+    Mutation<K, A, E, Result.forkEffect.OutputContext<A, E, R, P>, P>,
+    never,
+    Scope.Scope | Result.forkEffect.OutputContext<A, E, R, P>
+> {
+    return new MutationImpl(
+        yield* Effect.context<Scope.Scope | Result.forkEffect.OutputContext<A, E, R, P>>(),
+        options.f as any,
+        options.initialProgress as P,
+
+        yield* SubscriptionRef.make(Option.none<K>()),
+        yield* SubscriptionRef.make(Option.none<Fiber.Fiber<A, E>>()),
+        yield* SubscriptionRef.make(Result.initial<A, E, P>()),
+        yield* SubscriptionRef.make(Option.none<Result.Final<A, E, P>>()),
+    )
+})

packages/effect-fc/src/PropertyPath.ts

@@ -1,34 +1,34 @@
-import { Array, Function, Option, Predicate } from "effect"
+import { Array, Equivalence, Function, Option, Predicate } from "effect"
 
 
+export type PropertyPath = readonly PropertyKey[]
+
 type Prev = readonly [never, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
 
-export type Paths<T, D extends number = 5, Seen = never> = [] | (
-    D extends never ? [] :
-    T extends Seen ? [] :
-    T extends readonly any[] ? ArrayPaths<T, D, Seen | T> :
-    T extends object ? ObjectPaths<T, D, Seen | T> :
+export type Paths<T, D extends number = 5, Seen = never> = readonly [] | (
+    D extends never ? readonly [] :
+    T extends Seen ? readonly [] :
+    T extends readonly any[] ? {
+        [K in keyof T as K extends number ? K : never]:
+            | readonly [K]
+            | readonly [K, ...Paths<T[K], Prev[D], Seen | T>]
+    } extends infer O
+        ? O[keyof O]
+        : never
+    :
+    T extends object ? {
+        [K in keyof T as K extends string | number | symbol ? K : never]-?:
+            NonNullable<T[K]> extends infer V
+                ? readonly [K] | readonly [K, ...Paths<V, Prev[D], Seen>]
+                : never
+    } extends infer O
+        ? O[keyof O]
+        : never
+    :
     never
 )
 
-export type ArrayPaths<T extends readonly any[], D extends number, Seen> = {
-    [K in keyof T as K extends number ? K : never]:
-        | [K]
-        | [K, ...Paths<T[K], Prev[D], Seen>]
-} extends infer O
-    ? O[keyof O]
-    : never
-
-export type ObjectPaths<T extends object, D extends number, Seen> = {
-    [K in keyof T as K extends string | number | symbol ? K : never]-?:
-        NonNullable<T[K]> extends infer V
-            ? [K] | [K, ...Paths<V, Prev[D], Seen>]
-            : never
-} extends infer O
-    ? O[keyof O]
-    : never
-
-export type ValueFromPath<T, P extends any[]> = P extends [infer Head, ...infer Tail]
+export type ValueFromPath<T, P extends readonly any[]> = P extends readonly [infer Head, ...infer Tail]
     ? Head extends keyof T
         ? ValueFromPath<T[Head], Tail>
         : T extends readonly any[]
@@ -38,9 +38,8 @@ export type ValueFromPath<T, P extends any[]> = P extends [infer Head, ...infer
             : never
     : T
 
-export type AnyKey = string | number | symbol
-export type AnyPath = readonly AnyKey[]
 
+export const equivalence: Equivalence.Equivalence<PropertyPath> = Equivalence.array(Equivalence.strict())
 
 export const unsafeGet: {
     <T, const P extends Paths<T>>(path: P): (self: T) => ValueFromPath<T, P>
@@ -65,16 +64,16 @@ export const get: {
 )
 
 export const immutableSet: {
-    <T, const P extends Paths<T>>(path: P, value: ValueFromPath<T, P>): (self: T) => ValueFromPath<T, P>
+    <T, const P extends Paths<T>>(path: P, value: ValueFromPath<T, P>): (self: T) => Option.Option<T>
     <T, const P extends Paths<T>>(self: T, path: P, value: ValueFromPath<T, P>): Option.Option<T>
 } = Function.dual(3, <T, const P extends Paths<T>>(self: T, path: P, value: ValueFromPath<T, P>): Option.Option<T> => {
-    const key = Array.head(path as AnyPath)
+    const key = Array.head(path as PropertyPath)
     if (Option.isNone(key))
         return Option.some(value as T)
     if (!Predicate.hasProperty(self, key.value))
         return Option.none()
 
-    const child = immutableSet<any, any>(self[key.value], Option.getOrThrow(Array.tail(path as AnyPath)), value)
+    const child = immutableSet<any, any>(self[key.value], Option.getOrThrow(Array.tail(path as PropertyPath)), value)
     if (Option.isNone(child))
         return child
 

packages/effect-fc/src/PubSub.ts

@@ -0,0 +1,14 @@
+import { Effect, PubSub, type Scope } from "effect"
+import type * as React from "react"
+import * as Component from "./Component.js"
+
+
+export const usePubSubFromReactiveValues = Effect.fnUntraced(function* <const A extends React.DependencyList>(
+    values: A
+): Effect.fn.Return<PubSub.PubSub<A>, never, Scope.Scope> {
+    const pubsub = yield* Component.useOnMount(() => Effect.acquireRelease(PubSub.unbounded<A>(), PubSub.shutdown))
+    yield* Component.useReactEffect(() => Effect.unlessEffect(PubSub.publish(pubsub, values), PubSub.isShutdown(pubsub)), values)
+    return pubsub
+})
+
+export * from "effect/PubSub"

packages/effect-fc/src/Query.ts

@@ -0,0 +1,319 @@
+import { type Cause, type Context, DateTime, type Duration, Effect, Equal, Equivalence, Fiber, HashMap, identity, Option, Pipeable, Predicate, type Scope, Stream, Subscribable, SubscriptionRef } from "effect"
+import * as QueryClient from "./QueryClient.js"
+import * as Result from "./Result.js"
+
+
+export const QueryTypeId: unique symbol = Symbol.for("@effect-fc/Query/Query")
+export type QueryTypeId = typeof QueryTypeId
+
+export interface Query<in out K extends Query.AnyKey, in out A, in out E = never, in out R = never, in out P = never>
+extends Pipeable.Pipeable {
+    readonly [QueryTypeId]: QueryTypeId
+
+    readonly context: Context.Context<Scope.Scope | QueryClient.QueryClient | R>
+    readonly key: Stream.Stream<K>
+    readonly f: (key: K) => Effect.Effect<A, E, R>
+    readonly initialProgress: P
+
+    readonly staleTime: Duration.DurationInput
+    readonly refreshOnWindowFocus: boolean
+
+    readonly latestKey: Subscribable.Subscribable<Option.Option<K>>
+    readonly fiber: Subscribable.Subscribable<Option.Option<Fiber.Fiber<A, E>>>
+    readonly result: Subscribable.Subscribable<Result.Result<A, E, P>>
+    readonly latestFinalResult: Subscribable.Subscribable<Option.Option<Result.Final<A, E, P>>>
+
+    readonly run: Effect.Effect<void>
+    fetch(key: K): Effect.Effect<Result.Final<A, E, P>>
+    fetchSubscribable(key: K): Effect.Effect<Subscribable.Subscribable<Result.Result<A, E, P>>>
+    readonly refresh: Effect.Effect<Result.Final<A, E, P>, Cause.NoSuchElementException>
+    readonly refreshSubscribable: Effect.Effect<Subscribable.Subscribable<Result.Result<A, E, P>>, Cause.NoSuchElementException>
+
+    readonly invalidateCache: Effect.Effect<void>
+    invalidateCacheEntry(key: K): Effect.Effect<void>
+}
+
+export declare namespace Query {
+    export type AnyKey = readonly any[]
+}
+
+export class QueryImpl<in out K extends Query.AnyKey, in out A, in out E = never, in out R = never, in out P = never>
+extends Pipeable.Class() implements Query<K, A, E, R, P> {
+    readonly [QueryTypeId]: QueryTypeId = QueryTypeId
+
+    constructor(
+        readonly context: Context.Context<Scope.Scope | QueryClient.QueryClient | R>,
+        readonly key: Stream.Stream<K>,
+        readonly f: (key: K) => Effect.Effect<A, E, R>,
+        readonly initialProgress: P,
+
+        readonly staleTime: Duration.DurationInput,
+        readonly refreshOnWindowFocus: boolean,
+
+        readonly latestKey: SubscriptionRef.SubscriptionRef<Option.Option<K>>,
+        readonly fiber: SubscriptionRef.SubscriptionRef<Option.Option<Fiber.Fiber<A, E>>>,
+        readonly result: SubscriptionRef.SubscriptionRef<Result.Result<A, E, P>>,
+        readonly latestFinalResult: SubscriptionRef.SubscriptionRef<Option.Option<Result.Final<A, E, P>>>,
+
+        readonly runSemaphore: Effect.Semaphore,
+    ) {
+        super()
+    }
+
+    get run(): Effect.Effect<void> {
+        return Effect.all([
+            Stream.runForEach(this.key, key => this.fetchSubscribable(key)),
+
+            Effect.promise(() => import("@effect/platform-browser")).pipe(
+                Effect.andThen(({ BrowserStream }) => this.refreshOnWindowFocus
+                    ? Stream.runForEach(
+                        BrowserStream.fromEventListenerWindow("focus"),
+                        () => this.refreshSubscribable,
+                    )
+                    : Effect.void
+                ),
+                Effect.catchAllDefect(() => Effect.void),
+            ),
+        ], { concurrency: "unbounded" }).pipe(
+            Effect.ignore,
+            this.runSemaphore.withPermits(1),
+        )
+    }
+
+    get interrupt(): Effect.Effect<void, never, never> {
+        return Effect.andThen(this.fiber, Option.match({
+            onSome: Fiber.interrupt,
+            onNone: () => Effect.void,
+        }))
+    }
+
+    fetch(key: K): Effect.Effect<Result.Final<A, E, P>> {
+        return this.interrupt.pipe(
+            Effect.andThen(SubscriptionRef.set(this.latestKey, Option.some(key))),
+            Effect.andThen(this.latestFinalResult),
+            Effect.andThen(previous => this.startCached(key, Option.isSome(previous)
+                ? Result.willFetch(previous.value) as Result.Final<A, E, P>
+                : Result.initial()
+            )),
+            Effect.andThen(sub => this.watch(key, sub)),
+            Effect.provide(this.context),
+        )
+    }
+
+    fetchSubscribable(key: K): Effect.Effect<Subscribable.Subscribable<Result.Result<A, E, P>>> {
+        return this.interrupt.pipe(
+            Effect.andThen(SubscriptionRef.set(this.latestKey, Option.some(key))),
+            Effect.andThen(this.latestFinalResult),
+            Effect.andThen(previous => this.startCached(key, Option.isSome(previous)
+                ? Result.willFetch(previous.value) as Result.Final<A, E, P>
+                : Result.initial()
+            )),
+            Effect.tap(sub => Effect.forkScoped(this.watch(key, sub))),
+            Effect.provide(this.context),
+        )
+    }
+
+    get refresh(): Effect.Effect<Result.Final<A, E, P>, Cause.NoSuchElementException> {
+        return this.interrupt.pipe(
+            Effect.andThen(Effect.Do),
+            Effect.bind("latestKey", () => Effect.andThen(this.latestKey, identity)),
+            Effect.bind("latestFinalResult", () => this.latestFinalResult),
+            Effect.bind("subscribable", ({ latestKey, latestFinalResult }) =>
+                this.startCached(latestKey, Option.isSome(latestFinalResult)
+                    ? Result.willRefresh(latestFinalResult.value) as Result.Final<A, E, P>
+                    : Result.initial()
+                )
+            ),
+            Effect.andThen(({ latestKey, subscribable }) => this.watch(latestKey, subscribable)),
+            Effect.provide(this.context),
+        )
+    }
+
+    get refreshSubscribable(): Effect.Effect<
+        Subscribable.Subscribable<Result.Result<A, E, P>>,
+        Cause.NoSuchElementException
+    > {
+        return this.interrupt.pipe(
+            Effect.andThen(Effect.Do),
+            Effect.bind("latestKey", () => Effect.andThen(this.latestKey, identity)),
+            Effect.bind("latestFinalResult", () => this.latestFinalResult),
+            Effect.bind("subscribable", ({ latestKey, latestFinalResult }) =>
+                this.startCached(latestKey, Option.isSome(latestFinalResult)
+                    ? Result.willRefresh(latestFinalResult.value) as Result.Final<A, E, P>
+                    : Result.initial()
+                )
+            ),
+            Effect.tap(({ latestKey, subscribable }) => Effect.forkScoped(this.watch(latestKey, subscribable))),
+            Effect.map(({ subscribable }) => subscribable),
+            Effect.provide(this.context),
+        )
+    }
+
+    startCached(
+        key: K,
+        initial: Result.Initial | Result.Final<A, E, P>,
+    ): Effect.Effect<
+        Subscribable.Subscribable<Result.Result<A, E, P>>,
+        never,
+        Scope.Scope | QueryClient.QueryClient | R
+    > {
+        return Effect.andThen(this.getCacheEntry(key), Option.match({
+            onSome: entry => Effect.andThen(
+                QueryClient.isQueryClientCacheEntryStale(entry, this.staleTime),
+                isStale => isStale
+                    ? this.start(key, Result.willRefresh(entry.result) as Result.Final<A, E, P>)
+                    : Effect.succeed(Subscribable.make({
+                        get: Effect.succeed(entry.result as Result.Result<A, E, P>),
+                        get changes() { return Stream.make(entry.result as Result.Result<A, E, P>) },
+                    })),
+            ),
+            onNone: () => this.start(key, initial),
+        }))
+    }
+
+    start(
+        key: K,
+        initial: Result.Initial | Result.Final<A, E, P>,
+    ): Effect.Effect<
+        Subscribable.Subscribable<Result.Result<A, E, P>>,
+        never,
+        Scope.Scope | R
+    > {
+        return Result.unsafeForkEffect(
+            Effect.onExit(this.f(key), () => Effect.andThen(
+                Effect.all([Effect.fiberId, this.fiber]),
+                ([currentFiberId, fiber]) => Option.match(fiber, {
+                    onSome: v => Equal.equals(currentFiberId, v.id())
+                        ? SubscriptionRef.set(this.fiber, Option.none())
+                        : Effect.void,
+                    onNone: () => Effect.void,
+                }),
+            )),
+
+            {
+                initial,
+                initialProgress: this.initialProgress,
+            } as Result.unsafeForkEffect.Options<A, E, P>,
+        ).pipe(
+            Effect.tap(([, fiber]) => SubscriptionRef.set(this.fiber, Option.some(fiber))),
+            Effect.map(([sub]) => sub),
+        )
+    }
+
+    watch(
+        key: K,
+        sub: Subscribable.Subscribable<Result.Result<A, E, P>>
+    ): Effect.Effect<Result.Final<A, E, P>, never, QueryClient.QueryClient> {
+        return sub.get.pipe(
+            Effect.andThen(initial => Stream.runFoldEffect(
+                sub.changes,
+                initial,
+                (_, result) => Effect.as(SubscriptionRef.set(this.result, result), result),
+            ) as Effect.Effect<Result.Final<A, E, P>>),
+            Effect.tap(result => SubscriptionRef.set(this.latestFinalResult, Option.some(result))),
+            Effect.tap(result => Result.isSuccess(result)
+                ? this.updateCacheEntry(key, result)
+                : Effect.void
+            ),
+        )
+    }
+
+    makeCacheKey(key: K): QueryClient.QueryClientCacheKey {
+        return new QueryClient.QueryClientCacheKey(key, this.f as (key: Query.AnyKey) => Effect.Effect<unknown, unknown, unknown>)
+    }
+
+    getCacheEntry(
+        key: K
+    ): Effect.Effect<Option.Option<QueryClient.QueryClientCacheEntry>, never, QueryClient.QueryClient> {
+        return QueryClient.QueryClient.pipe(
+            Effect.andThen(client => client.cache),
+            Effect.map(HashMap.get(this.makeCacheKey(key))),
+        )
+    }
+
+    updateCacheEntry(
+        key: K,
+        result: Result.Success<A>,
+    ): Effect.Effect<QueryClient.QueryClientCacheEntry, never, QueryClient.QueryClient> {
+        return Effect.Do.pipe(
+            Effect.bind("client", () => QueryClient.QueryClient),
+            Effect.bind("now", () => DateTime.now),
+            Effect.let("entry", ({ now }) => new QueryClient.QueryClientCacheEntry(result, now)),
+            Effect.tap(({ client, entry }) => SubscriptionRef.update(
+                client.cache,
+                HashMap.set(this.makeCacheKey(key), entry),
+            )),
+            Effect.map(({ entry }) => entry),
+        )
+    }
+
+    get invalidateCache(): Effect.Effect<void> {
+        return QueryClient.QueryClient.pipe(
+            Effect.andThen(client => SubscriptionRef.update(
+                client.cache,
+                HashMap.filter((_, key) => !Equivalence.strict()(key.f, this.f)),
+            )),
+            Effect.provide(this.context),
+        )
+    }
+
+    invalidateCacheEntry(key: K): Effect.Effect<void> {
+        return QueryClient.QueryClient.pipe(
+            Effect.andThen(client => SubscriptionRef.update(
+                client.cache,
+                HashMap.remove(this.makeCacheKey(key)),
+            )),
+            Effect.provide(this.context),
+        )
+    }
+}
+
+export const isQuery = (u: unknown): u is Query<readonly unknown[], unknown, unknown, unknown, unknown> => Predicate.hasProperty(u, QueryTypeId)
+
+export declare namespace make {
+    export interface Options<K extends Query.AnyKey, A, E = never, R = never, P = never> {
+        readonly key: Stream.Stream<K>
+        readonly f: (key: NoInfer<K>) => Effect.Effect<A, E, Result.forkEffect.InputContext<R, NoInfer<P>>>
+        readonly initialProgress?: P
+        readonly staleTime?: Duration.DurationInput
+        readonly refreshOnWindowFocus?: boolean
+    }
+}
+
+export const make = Effect.fnUntraced(function* <K extends Query.AnyKey, A, E = never, R = never, P = never>(
+    options: make.Options<K, A, E, R, P>
+): Effect.fn.Return<
+    Query<K, A, E, Result.forkEffect.OutputContext<A, E, R, P>, P>,
+    never,
+    Scope.Scope | QueryClient.QueryClient | Result.forkEffect.OutputContext<A, E, R, P>
+> {
+    const client = yield* QueryClient.QueryClient
+
+    return new QueryImpl(
+        yield* Effect.context<Scope.Scope | QueryClient.QueryClient | Result.forkEffect.OutputContext<A, E, R, P>>(),
+        options.key,
+        options.f as any,
+        options.initialProgress as P,
+
+        options.staleTime ?? client.defaultStaleTime,
+        options.refreshOnWindowFocus ?? client.defaultRefreshOnWindowFocus,
+
+        yield* SubscriptionRef.make(Option.none<K>()),
+        yield* SubscriptionRef.make(Option.none<Fiber.Fiber<A, E>>()),
+        yield* SubscriptionRef.make(Result.initial<A, E, P>()),
+        yield* SubscriptionRef.make(Option.none<Result.Final<A, E, P>>()),
+
+        yield* Effect.makeSemaphore(1),
+    )
+})
+
+export const service = <K extends Query.AnyKey, A, E = never, R = never, P = never>(
+    options: make.Options<K, A, E, R, P>
+): Effect.Effect<
+    Query<K, A, E, Result.forkEffect.OutputContext<A, E, R, P>, P>,
+    never,
+    Scope.Scope | QueryClient.QueryClient | Result.forkEffect.OutputContext<A, E, R, P>
+> => Effect.tap(
+    make(options),
+    query => Effect.forkScoped(query.run),
+)

packages/effect-fc/src/QueryClient.ts

@@ -0,0 +1,119 @@
+import { DateTime, Duration, Effect, Equal, Equivalence, Hash, HashMap, Pipeable, Predicate, type Scope, SubscriptionRef } from "effect"
+import type * as Query from "./Query.js"
+import type * as Result from "./Result.js"
+
+
+export const QueryClientServiceTypeId: unique symbol = Symbol.for("@effect-fc/QueryClient/QueryClientServiceTypeId")
+export type QueryClientServiceTypeId = typeof QueryClientServiceTypeId
+
+export interface QueryClientService extends Pipeable.Pipeable {
+    readonly [QueryClientServiceTypeId]: QueryClientServiceTypeId
+    readonly cache: SubscriptionRef.SubscriptionRef<HashMap.HashMap<QueryClientCacheKey, QueryClientCacheEntry>>
+    readonly gcTime: Duration.DurationInput
+    readonly defaultStaleTime: Duration.DurationInput
+    readonly defaultRefreshOnWindowFocus: boolean
+}
+
+export class QueryClient extends Effect.Service<QueryClient>()("@effect-fc/QueryClient/QueryClient", {
+    scoped: Effect.suspend(() => service())
+}) {}
+
+export class QueryClientServiceImpl
+extends Pipeable.Class()
+implements QueryClientService {
+    readonly [QueryClientServiceTypeId]: QueryClientServiceTypeId = QueryClientServiceTypeId
+
+    constructor(
+        readonly cache: SubscriptionRef.SubscriptionRef<HashMap.HashMap<QueryClientCacheKey, QueryClientCacheEntry>>,
+        readonly gcTime: Duration.DurationInput,
+        readonly defaultStaleTime: Duration.DurationInput,
+        readonly defaultRefreshOnWindowFocus: boolean,
+        readonly runSemaphore: Effect.Semaphore,
+    ) {
+        super()
+    }
+}
+
+export const isQueryClientService = (u: unknown): u is QueryClientService => Predicate.hasProperty(u, QueryClientServiceTypeId)
+
+export declare namespace make {
+    export interface Options {
+        readonly gcTime?: Duration.DurationInput
+        readonly defaultStaleTime?: Duration.DurationInput
+        readonly defaultRefreshOnWindowFocus?: boolean
+    }
+}
+
+export const make = Effect.fnUntraced(function* (options: make.Options = {}): Effect.fn.Return<QueryClientService> {
+    return new QueryClientServiceImpl(
+        yield* SubscriptionRef.make(HashMap.empty<QueryClientCacheKey, QueryClientCacheEntry>()),
+        options.gcTime ?? "5 minutes",
+        options.defaultStaleTime ?? "0 minutes",
+        options.defaultRefreshOnWindowFocus ?? true,
+        yield* Effect.makeSemaphore(1),
+    )
+})
+
+export const run = (_self: QueryClientService): Effect.Effect<void> => Effect.void
+
+export declare namespace service {
+    export interface Options extends make.Options {}
+}
+
+export const service = (options?: service.Options): Effect.Effect<QueryClientService, never, Scope.Scope> => Effect.tap(
+    make(options),
+    client => Effect.forkScoped(run(client)),
+)
+
+
+export const QueryClientCacheKeyTypeId: unique symbol = Symbol.for("@effect-fc/QueryClient/QueryClientCacheKey")
+export type QueryClientCacheKeyTypeId = typeof QueryClientCacheKeyTypeId
+
+export class QueryClientCacheKey
+extends Pipeable.Class()
+implements Pipeable.Pipeable, Equal.Equal {
+    readonly [QueryClientCacheKeyTypeId]: QueryClientCacheKeyTypeId = QueryClientCacheKeyTypeId
+
+    constructor(
+        readonly key: Query.Query.AnyKey,
+        readonly f: (key: Query.Query.AnyKey) => Effect.Effect<unknown, unknown, unknown>,
+    ) {
+        super()
+    }
+
+    [Equal.symbol](that: Equal.Equal) {
+        return isQueryClientCacheKey(that) && Equivalence.array(Equal.equivalence())(this.key, that.key) && Equivalence.strict()(this.f, that.f)
+    }
+    [Hash.symbol]() {
+        return Hash.combine(Hash.hash(this.f))(Hash.array(this.key))
+    }
+}
+
+export const isQueryClientCacheKey = (u: unknown): u is QueryClientCacheKey => Predicate.hasProperty(u, QueryClientCacheKeyTypeId)
+
+
+export const QueryClientCacheEntryTypeId: unique symbol = Symbol.for("@effect-fc/QueryClient/QueryClientCacheEntry")
+export type QueryClientCacheEntryTypeId = typeof QueryClientCacheEntryTypeId
+
+export class QueryClientCacheEntry
+extends Pipeable.Class()
+implements Pipeable.Pipeable {
+    readonly [QueryClientCacheEntryTypeId]: QueryClientCacheEntryTypeId = QueryClientCacheEntryTypeId
+
+    constructor(
+        readonly result: Result.Success<unknown>,
+        readonly createdAt: DateTime.DateTime,
+    ) {
+        super()
+    }
+}
+
+export const isQueryClientCacheEntry = (u: unknown): u is QueryClientCacheEntry => Predicate.hasProperty(u, QueryClientCacheEntryTypeId)
+
+export const isQueryClientCacheEntryStale = (
+    self: QueryClientCacheEntry,
+    staleTime: Duration.DurationInput,
+): Effect.Effect<boolean> => Effect.andThen(
+    DateTime.now,
+    now => Duration.greaterThanOrEqualTo(DateTime.distanceDuration(self.createdAt, now), staleTime),
+)

packages/effect-fc/src/ReactManagedRuntime.ts

@@ -1,47 +0,0 @@
-import { Effect, type Layer, ManagedRuntime, type Runtime } from "effect"
-import * as React from "react"
-
-
-export interface ReactManagedRuntime<R, ER> {
-    readonly runtime: ManagedRuntime.ManagedRuntime<R, ER>
-    readonly context: React.Context<Runtime.Runtime<R>>
-}
-
-export const make = <R, ER>(
-    layer: Layer.Layer<R, ER>,
-    memoMap?: Layer.MemoMap,
-): ReactManagedRuntime<R, ER> => ({
-    runtime: ManagedRuntime.make(layer, memoMap),
-    context: React.createContext<Runtime.Runtime<R>>(null!),
-})
-
-
-export interface ProviderProps<R, ER> extends React.SuspenseProps {
-    readonly runtime: ReactManagedRuntime<R, ER>
-    readonly children?: React.ReactNode
-}
-
-export function Provider<R, ER>(
-    { runtime, children, ...suspenseProps }: ProviderProps<R, ER>
-): React.ReactNode {
-    const promise = React.useMemo(() => Effect.runPromise(runtime.runtime.runtimeEffect), [runtime])
-
-    return React.createElement(
-        React.Suspense,
-        suspenseProps,
-        React.createElement(ProviderInner<R, ER>, { runtime, promise, children }),
-    )
-}
-
-interface ProviderInnerProps<R, ER> {
-    readonly runtime: ReactManagedRuntime<R, ER>
-    readonly promise: Promise<Runtime.Runtime<R>>
-    readonly children?: React.ReactNode
-}
-
-function ProviderInner<R, ER>(
-    { runtime, promise, children }: ProviderInnerProps<R, ER>
-): React.ReactNode {
-    const value = React.use(promise)
-    return React.createElement(runtime.context, { value }, children)
-}

packages/effect-fc/src/ReactRuntime.ts

@@ -0,0 +1,85 @@
+/** biome-ignore-all lint/complexity/useArrowFunction: necessary for class prototypes */
+import { Effect, Layer, ManagedRuntime, Predicate, Runtime, Scope } from "effect"
+import * as React from "react"
+import * as Component from "./Component.js"
+import * as ErrorObserver from "./ErrorObserver.js"
+import * as QueryClient from "./QueryClient.js"
+
+
+export const TypeId: unique symbol = Symbol.for("@effect-fc/ReactRuntime/ReactRuntime")
+export type TypeId = typeof TypeId
+
+export interface ReactRuntime<R, ER> {
+    new(_: never): Record<string, never>
+    readonly [TypeId]: TypeId
+    readonly runtime: ManagedRuntime.ManagedRuntime<R, ER>
+    readonly context: React.Context<Runtime.Runtime<R>>
+}
+
+const ReactRuntimeProto = Object.freeze({ [TypeId]: TypeId } as const)
+
+export const Prelude: Layer.Layer<
+    | Component.ScopeMap
+    | ErrorObserver.ErrorObserver
+    | QueryClient.QueryClient
+> = Layer.mergeAll(
+    Component.ScopeMap.Default,
+    ErrorObserver.layer,
+    QueryClient.QueryClient.Default,
+)
+
+
+export const isReactRuntime = (u: unknown): u is ReactRuntime<unknown, unknown> => Predicate.hasProperty(u, TypeId)
+
+export const make = <R, ER>(
+    layer: Layer.Layer<R, ER>,
+    memoMap?: Layer.MemoMap,
+): ReactRuntime<Layer.Layer.Success<typeof Prelude> | R, ER> => Object.setPrototypeOf(
+    Object.assign(function() {}, {
+        runtime: ManagedRuntime.make(
+            Layer.merge(layer, Prelude),
+            memoMap,
+        ),
+        // biome-ignore lint/style/noNonNullAssertion: context initialization
+        context: React.createContext<Runtime.Runtime<R>>(null!),
+    }),
+    ReactRuntimeProto,
+)
+
+
+export namespace Provider {
+    export interface Props<R, ER> extends React.SuspenseProps {
+        readonly runtime: ReactRuntime<R, ER>
+        readonly children?: React.ReactNode
+    }
+}
+
+export const Provider = <R, ER>(
+    { runtime, children, ...suspenseProps }: Provider.Props<R, ER>
+): React.ReactNode => {
+    const promise = React.useMemo(() => Effect.runPromise(runtime.runtime.runtimeEffect), [runtime])
+
+    return React.createElement(
+        React.Suspense,
+        suspenseProps,
+        React.createElement(ProviderInner<R, ER>, { runtime, promise, children }),
+    )
+}
+
+const ProviderInner = <R, ER>(
+    { runtime, promise, children }: {
+        readonly runtime: ReactRuntime<R, ER>
+        readonly promise: Promise<Runtime.Runtime<R>>
+        readonly children?: React.ReactNode
+    }
+): React.ReactNode => {
+    const effectRuntime = React.use(promise)
+    const scope = Runtime.runSync(effectRuntime)(Component.useScope([effectRuntime]))
+    Runtime.runSync(effectRuntime)(Effect.provideService(
+        Component.useOnChange(() => Effect.addFinalizer(() => runtime.runtime.disposeEffect), [scope]),
+        Scope.Scope,
+        scope,
+    ))
+
+    return React.createElement(runtime.context, { value: effectRuntime }, children)
+}

packages/effect-fc/src/Result.ts

@@ -0,0 +1,279 @@
+import { Cause, Context, Data, Effect, Equal, Exit, type Fiber, Hash, Layer, Match, Pipeable, Predicate, PubSub, pipe, Ref, type Scope, Stream, Subscribable } from "effect"
+
+
+export const ResultTypeId: unique symbol = Symbol.for("@effect-fc/Result/Result")
+export type ResultTypeId = typeof ResultTypeId
+
+export type Result<A, E = never, P = never> = (
+    | Initial
+    | Running<P>
+    | Final<A, E, P>
+)
+
+// biome-ignore lint/complexity/noBannedTypes: "{}" is relevant here
+export type Final<A, E = never, P = never> = (Success<A> | Failure<E>) & ({} | Flags<P>)
+export type Flags<P = never> = WillFetch | WillRefresh | Refreshing<P>
+
+export declare namespace Result {
+    export interface Prototype extends Pipeable.Pipeable, Equal.Equal {
+        readonly [ResultTypeId]: ResultTypeId
+    }
+
+    export type Success<R extends Result<any, any, any>> = [R] extends [Result<infer A, infer _E, infer _P>] ? A : never
+    export type Failure<R extends Result<any, any, any>> = [R] extends [Result<infer _A, infer E, infer _P>] ? E : never
+    export type Progress<R extends Result<any, any, any>> = [R] extends [Result<infer _A, infer _E, infer P>] ? P : never
+}
+
+export declare namespace Flags {
+    export type Keys = keyof WillFetch & WillRefresh & Refreshing<any>
+}
+
+export interface Initial extends Result.Prototype {
+    readonly _tag: "Initial"
+}
+
+export interface Running<P = never> extends Result.Prototype {
+    readonly _tag: "Running"
+    readonly progress: P
+}
+
+export interface Success<A> extends Result.Prototype {
+    readonly _tag: "Success"
+    readonly value: A
+}
+
+export interface Failure<E = never> extends Result.Prototype {
+    readonly _tag: "Failure"
+    readonly cause: Cause.Cause<E>
+}
+
+export interface WillFetch {
+    readonly _flag: "WillFetch"
+}
+
+export interface WillRefresh {
+    readonly _flag: "WillRefresh"
+}
+
+export interface Refreshing<P = never> {
+    readonly _flag: "Refreshing"
+    readonly progress: P
+}
+
+
+const ResultPrototype = Object.freeze({
+    ...Pipeable.Prototype,
+    [ResultTypeId]: ResultTypeId,
+
+    [Equal.symbol](this: Result<any, any, any>, that: Result<any, any, any>): boolean {
+        if (this._tag !== that._tag || (this as Flags)._flag !== (that as Flags)._flag)
+            return false
+        if (hasRefreshingFlag(this) && !Equal.equals(this.progress, (that as Refreshing<any>).progress))
+            return false
+        return Match.value(this).pipe(
+            Match.tag("Initial", () => true),
+            Match.tag("Running", self => Equal.equals(self.progress, (that as Running<any>).progress)),
+            Match.tag("Success", self => Equal.equals(self.value, (that as Success<any>).value)),
+            Match.tag("Failure", self => Equal.equals(self.cause, (that as Failure<any>).cause)),
+            Match.exhaustive,
+        )
+    },
+
+    [Hash.symbol](this: Result<any, any, any>): number {
+        return pipe(Hash.string(this._tag),
+            tagHash => Match.value(this).pipe(
+                Match.tag("Initial", () => tagHash),
+                Match.tag("Running", self => Hash.combine(Hash.hash(self.progress))(tagHash)),
+                Match.tag("Success", self => Hash.combine(Hash.hash(self.value))(tagHash)),
+                Match.tag("Failure", self => Hash.combine(Hash.hash(self.cause))(tagHash)),
+                Match.exhaustive,
+            ),
+            Hash.combine(Hash.hash((this as Flags)._flag)),
+            hash => hasRefreshingFlag(this)
+                ? Hash.combine(Hash.hash(this.progress))(hash)
+                : hash,
+            Hash.cached(this),
+        )
+    },
+} as const satisfies Result.Prototype)
+
+
+export const isResult = (u: unknown): u is Result<unknown, unknown, unknown> => Predicate.hasProperty(u, ResultTypeId)
+export const isFinal = (u: unknown): u is Final<unknown, unknown, unknown> => isResult(u) && (isSuccess(u) || isFailure(u))
+export const isInitial = (u: unknown): u is Initial => isResult(u) && u._tag === "Initial"
+export const isRunning = (u: unknown): u is Running<unknown> => isResult(u) && u._tag === "Running"
+export const isSuccess = (u: unknown): u is Success<unknown> => isResult(u) && u._tag === "Success"
+export const isFailure = (u: unknown): u is Failure<unknown> => isResult(u) && u._tag === "Failure"
+export const hasFlag = (u: unknown): u is Flags => isResult(u) && Predicate.hasProperty(u, "_flag")
+export const hasWillFetchFlag = (u: unknown): u is WillFetch => isResult(u) && Predicate.hasProperty(u, "_flag") && u._flag === "WillFetch"
+export const hasWillRefreshFlag = (u: unknown): u is WillRefresh => isResult(u) && Predicate.hasProperty(u, "_flag") && u._flag === "WillRefresh"
+export const hasRefreshingFlag = (u: unknown): u is Refreshing<unknown> => isResult(u) && Predicate.hasProperty(u, "_flag") && u._flag === "Refreshing"
+
+export const initial: {
+    (): Initial
+    <A, E = never, P = never>(): Result<A, E, P>
+} = (): Initial => Object.setPrototypeOf({ _tag: "Initial" }, ResultPrototype)
+export const running = <P = never>(progress?: P): Running<P> => Object.setPrototypeOf({ _tag: "Running", progress }, ResultPrototype)
+export const succeed = <A>(value: A): Success<A> => Object.setPrototypeOf({ _tag: "Success", value }, ResultPrototype)
+export const fail = <E>(cause: Cause.Cause<E> ): Failure<E> => Object.setPrototypeOf({ _tag: "Failure", cause }, ResultPrototype)
+
+export const willFetch = <R extends Final<any, any, any>>(
+    result: R
+): Omit<R, keyof Flags.Keys> & WillFetch => Object.setPrototypeOf(
+    Object.assign({}, result, { _flag: "WillFetch" }),
+    Object.getPrototypeOf(result),
+)
+
+export const willRefresh = <R extends Final<any, any, any>>(
+    result: R
+): Omit<R, keyof Flags.Keys> & WillRefresh => Object.setPrototypeOf(
+    Object.assign({}, result, { _flag: "WillRefresh" }),
+    Object.getPrototypeOf(result),
+)
+
+export const refreshing = <R extends Final<any, any, any>, P = never>(
+    result: R,
+    progress?: P,
+): Omit<R, keyof Flags.Keys> & Refreshing<P> => Object.setPrototypeOf(
+    Object.assign({}, result, { _flag: "Refreshing", progress }),
+    Object.getPrototypeOf(result),
+)
+
+export const fromExit: {
+    <A, E>(exit: Exit.Success<A, E>): Success<A>
+    <A, E>(exit: Exit.Failure<A, E>): Failure<E>
+    <A, E>(exit: Exit.Exit<A, E>): Success<A> | Failure<E>
+} = exit => (exit._tag === "Success" ? succeed(exit.value) : fail(exit.cause)) as any
+
+export const toExit: {
+    <A>(self: Success<A>): Exit.Success<A, never>
+    <E>(self: Failure<E>): Exit.Failure<never, E>
+    <A, E, P>(self: Final<A, E, P>): Exit.Exit<A, E>
+    <A, E, P>(self: Result<A, E, P>): Exit.Exit<A, E | Cause.NoSuchElementException>
+} = <A, E, P>(self: Result<A, E, P>): any => {
+    switch (self._tag) {
+        case "Success":
+            return Exit.succeed(self.value)
+        case "Failure":
+            return Exit.failCause(self.cause)
+        default:
+            return Exit.fail(new Cause.NoSuchElementException())
+    }
+}
+
+
+export interface State<A, E = never, P = never> {
+    readonly get: Effect.Effect<Result<A, E, P>>
+    readonly set: (v: Result<A, E, P>) => Effect.Effect<void>
+}
+
+export const State = <A, E = never, P = never>(): Context.Tag<State<A, E, P>, State<A, E, P>> => Context.GenericTag("@effect-fc/Result/State")
+
+export interface Progress<P = never> {
+    readonly update: <E, R>(
+        f: (previous: P) => Effect.Effect<P, E, R>
+    ) => Effect.Effect<void, PreviousResultNotRunningNorRefreshing | E, R>
+}
+
+export class PreviousResultNotRunningNorRefreshing extends Data.TaggedError("@effect-fc/Result/PreviousResultNotRunningNorRefreshing")<{
+    readonly previous: Result<unknown, unknown, unknown>
+}> {}
+
+export const Progress = <P = never>(): Context.Tag<Progress<P>, Progress<P>> => Context.GenericTag("@effect-fc/Result/Progress")
+
+export const makeProgressLayer = <A, E, P = never>(): Layer.Layer<
+    Progress<P>,
+    never,
+    State<A, E, P>
+> => Layer.effect(Progress<P>(), Effect.gen(function*() {
+    const state = yield* State<A, E, P>()
+
+    return {
+        update: <FE, FR>(f: (previous: P) => Effect.Effect<P, FE, FR>) => Effect.Do.pipe(
+            Effect.bind("previous", () => Effect.andThen(state.get, previous =>
+                (isRunning(previous) || hasRefreshingFlag(previous))
+                    ? Effect.succeed(previous)
+                    : Effect.fail(new PreviousResultNotRunningNorRefreshing({ previous })),
+            )),
+            Effect.bind("progress", ({ previous }) => f(previous.progress)),
+            Effect.let("next", ({ previous, progress }) => isRunning(previous)
+                ? running(progress)
+                : refreshing(previous, progress) as Final<A, E, P> & Refreshing<P>
+            ),
+            Effect.andThen(({ next }) => state.set(next)),
+        ),
+    }
+}))
+
+
+export namespace unsafeForkEffect {
+    export type OutputContext<A, E, R, P> = Exclude<R, State<A, E, P> | Progress<P> | Progress<never>>
+
+    export interface Options<A, E, P> {
+        readonly initial?: Initial | Final<A, E, P>
+        readonly initialProgress?: P
+    }
+}
+
+export const unsafeForkEffect = <A, E, R, P = never>(
+    effect: Effect.Effect<A, E, R>,
+    options?: unsafeForkEffect.Options<NoInfer<A>, NoInfer<E>, P>,
+): Effect.Effect<
+    readonly [result: Subscribable.Subscribable<Result<A, E, P>, never, never>, fiber: Fiber.Fiber<A, E>],
+    never,
+    Scope.Scope | unsafeForkEffect.OutputContext<A, E, R, P>
+> => Effect.Do.pipe(
+    Effect.bind("ref", () => Ref.make(options?.initial ?? initial<A, E, P>())),
+    Effect.bind("pubsub", () => PubSub.unbounded<Result<A, E, P>>()),
+    Effect.bind("fiber", ({ ref, pubsub }) => Effect.forkScoped(State<A, E, P>().pipe(
+        Effect.andThen(state => state.set(
+            (isFinal(options?.initial) && hasWillRefreshFlag(options?.initial))
+                ? refreshing(options.initial, options?.initialProgress) as Result<A, E, P>
+                : running(options?.initialProgress)
+        ).pipe(
+            Effect.andThen(effect),
+            Effect.onExit(exit => Effect.andThen(
+                state.set(fromExit(exit)),
+                Effect.forkScoped(PubSub.shutdown(pubsub)),
+            )),
+        )),
+        Effect.provide(Layer.empty.pipe(
+            Layer.provideMerge(makeProgressLayer<A, E, P>()),
+            Layer.provideMerge(Layer.succeed(State<A, E, P>(), {
+                get: ref,
+                set: v => Effect.andThen(Ref.set(ref, v), PubSub.publish(pubsub, v))
+            })),
+        )),
+    ))),
+    Effect.map(({ ref, pubsub, fiber }) => [
+        Subscribable.make({
+            get: ref,
+            changes: Stream.unwrapScoped(Effect.map(
+                Effect.all([ref, Stream.fromPubSub(pubsub, { scoped: true })]),
+                ([latest, stream]) => Stream.concat(Stream.make(latest), stream),
+            )),
+        }),
+        fiber,
+    ]),
+) as Effect.Effect<
+    readonly [result: Subscribable.Subscribable<Result<A, E, P>, never, never>, fiber: Fiber.Fiber<A, E>],
+    never,
+    Scope.Scope | unsafeForkEffect.OutputContext<A, E, R, P>
+>
+
+export namespace forkEffect {
+    export type InputContext<R, P> = R extends Progress<infer X> ? [X] extends [P] ? R : never : R
+    export type OutputContext<A, E, R, P> = unsafeForkEffect.OutputContext<A, E, R, P>
+    export interface Options<A, E, P> extends unsafeForkEffect.Options<A, E, P> {}
+}
+
+export const forkEffect: {
+    <A, E, R, P = never>(
+        effect: Effect.Effect<A, E, forkEffect.InputContext<R, NoInfer<P>>>,
+        options?: forkEffect.Options<NoInfer<A>, NoInfer<E>, P>,
+    ): Effect.Effect<
+        readonly [result: Subscribable.Subscribable<Result<A, E, P>, never, never>, fiber: Fiber.Fiber<A, E>],
+        never,
+        Scope.Scope | forkEffect.OutputContext<A, E, R, P>
+    >
+} = unsafeForkEffect

packages/effect-fc/src/Stream.ts

@@ -0,0 +1,33 @@
+import { Effect, Equivalence, Option, Stream } from "effect"
+import * as React from "react"
+import * as Component from "./Component.js"
+
+
+export const useStream: {
+    <A, E, R>(
+        stream: Stream.Stream<A, E, R>
+    ): Effect.Effect<Option.Option<A>, never, R>
+    <A extends NonNullable<unknown>, E, R>(
+        stream: Stream.Stream<A, E, R>,
+        initialValue: A,
+    ): Effect.Effect<Option.Some<A>, never, R>
+} = Effect.fnUntraced(function* <A extends NonNullable<unknown>, E, R>(
+    stream: Stream.Stream<A, E, R>,
+    initialValue?: A,
+) {
+    const [reactStateValue, setReactStateValue] = React.useState(() => initialValue
+        ? Option.some(initialValue)
+        : Option.none()
+    )
+
+    yield* Component.useReactEffect(() => Effect.forkScoped(
+        Stream.runForEach(
+            Stream.changesWith(stream, Equivalence.strict()),
+            v => Effect.sync(() => setReactStateValue(Option.some(v))),
+        )
+    ), [stream])
+
+    return reactStateValue as Option.Some<A>
+})
+
+export * from "effect/Stream"

packages/effect-fc/src/Subscribable.ts

@@ -0,0 +1,52 @@
+import { Effect, Equivalence, Stream, Subscribable } from "effect"
+import * as React from "react"
+import * as Component from "./Component.js"
+
+
+export const zipLatestAll = <const T extends readonly Subscribable.Subscribable<any, any, any>[]>(
+    ...elements: T
+): Subscribable.Subscribable<
+    [T[number]] extends [never]
+        ? never
+        : { [K in keyof T]: T[K] extends Subscribable.Subscribable<infer A, infer _E, infer _R> ? A : never },
+    [T[number]] extends [never] ? never : T[number] extends Subscribable.Subscribable<infer _A, infer E, infer _R> ? E : never,
+    [T[number]] extends [never] ? never : T[number] extends Subscribable.Subscribable<infer _A, infer _E, infer R> ? R : never
+> => Subscribable.make({
+    get: Effect.all(elements.map(v => v.get)),
+    changes: Stream.zipLatestAll(...elements.map(v => v.changes)),
+}) as any
+
+export declare namespace useSubscribables {
+    export type Success<T extends readonly Subscribable.Subscribable<any, any, any>[]> = [T[number]] extends [never]
+        ? never
+        : { [K in keyof T]: T[K] extends Subscribable.Subscribable<infer A, infer _E, infer _R> ? A : never }
+
+    export interface Options<A> {
+        readonly equivalence?: Equivalence.Equivalence<A>
+    }
+}
+
+export const useSubscribables = Effect.fnUntraced(function* <const T extends readonly Subscribable.Subscribable<any, any, any>[]>(
+    elements: T,
+    options?: useSubscribables.Options<useSubscribables.Success<NoInfer<T>>>,
+): Effect.fn.Return<
+    useSubscribables.Success<T>,
+    [T[number]] extends [never] ? never : T[number] extends Subscribable.Subscribable<infer _A, infer E, infer _R> ? E : never,
+    [T[number]] extends [never] ? never : T[number] extends Subscribable.Subscribable<infer _A, infer _E, infer R> ? R : never
+> {
+    const [reactStateValue, setReactStateValue] = React.useState(
+        yield* Component.useOnMount(() => Effect.all(elements.map(v => v.get)))
+    )
+
+    yield* Component.useReactEffect(() => Stream.zipLatestAll(...elements.map(ref => ref.changes)).pipe(
+        Stream.changesWith((options?.equivalence as Equivalence.Equivalence<any[]> | undefined) ?? Equivalence.array(Equivalence.strict())),
+        Stream.runForEach(v =>
+            Effect.sync(() => setReactStateValue(v))
+        ),
+        Effect.forkScoped,
+    ), elements)
+
+    return reactStateValue as any
+})
+
+export * from "effect/Subscribable"

packages/effect-fc/src/SubscriptionRef.ts

@@ -0,0 +1,61 @@
+import { Effect, Equivalence, Ref, Stream, SubscriptionRef } from "effect"
+import * as React from "react"
+import * as Component from "./Component.js"
+import * as SetStateAction from "./SetStateAction.js"
+
+
+export declare namespace useSubscriptionRefState {
+    export interface Options<A> {
+        readonly equivalence?: Equivalence.Equivalence<A>
+    }
+}
+
+export const useSubscriptionRefState = Effect.fnUntraced(function* <A>(
+    ref: SubscriptionRef.SubscriptionRef<A>,
+    options?: useSubscriptionRefState.Options<NoInfer<A>>,
+): Effect.fn.Return<readonly [A, React.Dispatch<React.SetStateAction<A>>]> {
+    const [reactStateValue, setReactStateValue] = React.useState(yield* Component.useOnMount(() => ref))
+
+    yield* Component.useReactEffect(() => Effect.forkScoped(
+        Stream.runForEach(
+            Stream.changesWith(ref.changes, options?.equivalence ?? Equivalence.strict()),
+            v => Effect.sync(() => setReactStateValue(v)),
+        )
+    ), [ref])
+
+    const setValue = yield* Component.useCallbackSync(
+        (setStateAction: React.SetStateAction<A>) => Effect.andThen(
+            Ref.updateAndGet(ref, prevState => SetStateAction.value(setStateAction, prevState)),
+            v => setReactStateValue(v),
+        ),
+        [ref],
+    )
+
+    return [reactStateValue, setValue]
+})
+
+export declare namespace useSubscriptionRefFromState {
+    export interface Options<A> {
+        readonly equivalence?: Equivalence.Equivalence<A>
+    }
+}
+
+export const useSubscriptionRefFromState = Effect.fnUntraced(function* <A>(
+    [value, setValue]: readonly [A, React.Dispatch<React.SetStateAction<A>>],
+    options?: useSubscriptionRefFromState.Options<NoInfer<A>>,
+): Effect.fn.Return<SubscriptionRef.SubscriptionRef<A>> {
+    const ref = yield* Component.useOnChange(() => Effect.tap(
+        SubscriptionRef.make(value),
+        ref => Effect.forkScoped(
+            Stream.runForEach(
+                Stream.changesWith(ref.changes, options?.equivalence ?? Equivalence.strict()),
+                v => Effect.sync(() => setValue(v)),
+            )
+        ),
+    ), [setValue])
+
+    yield* Component.useReactEffect(() => Ref.set(ref, value), [value])
+    return ref
+})
+
+export * from "effect/SubscriptionRef"

packages/effect-fc/src/SubscriptionSubRef.ts

@@ -0,0 +1,186 @@
+import { Chunk, Effect, Effectable, Option, Predicate, Readable, Ref, Stream, Subscribable, SubscriptionRef, SynchronizedRef, type Types, type Unify } from "effect"
+import * as PropertyPath from "./PropertyPath.js"
+
+
+export const SubscriptionSubRefTypeId: unique symbol = Symbol.for("@effect-fc/SubscriptionSubRef/SubscriptionSubRef")
+export type SubscriptionSubRefTypeId = typeof SubscriptionSubRefTypeId
+
+export interface SubscriptionSubRef<in out A, in out B extends SubscriptionRef.SubscriptionRef<any>>
+extends SubscriptionSubRef.Variance<A, B>, SubscriptionRef.SubscriptionRef<A> {
+    readonly parent: B
+
+    readonly [Unify.typeSymbol]?: unknown
+    readonly [Unify.unifySymbol]?: SubscriptionSubRefUnify<this>
+    readonly [Unify.ignoreSymbol]?: SubscriptionSubRefUnifyIgnore
+}
+
+export declare namespace SubscriptionSubRef {
+    export interface Variance<in out A, in out B> {
+        readonly [SubscriptionSubRefTypeId]: {
+            readonly _A: Types.Invariant<A>
+            readonly _B: Types.Invariant<B>
+        }
+    }
+}
+
+export interface SubscriptionSubRefUnify<A extends { [Unify.typeSymbol]?: any }> extends SubscriptionRef.SubscriptionRefUnify<A> {
+    SubscriptionSubRef?: () => Extract<A[Unify.typeSymbol], SubscriptionSubRef<any, any>>
+}
+
+export interface SubscriptionSubRefUnifyIgnore extends SubscriptionRef.SubscriptionRefUnifyIgnore {
+    SubscriptionRef?: true
+}
+
+
+const refVariance = { _A: (_: any) => _ }
+const synchronizedRefVariance = { _A: (_: any) => _ }
+const subscriptionRefVariance = { _A: (_: any) => _ }
+const subscriptionSubRefVariance = { _A: (_: any) => _, _B: (_: any) => _ }
+
+class SubscriptionSubRefImpl<in out A, in out B extends SubscriptionRef.SubscriptionRef<any>>
+extends Effectable.Class<A> implements SubscriptionSubRef<A, B> {
+    readonly [Readable.TypeId]: Readable.TypeId = Readable.TypeId
+    readonly [Subscribable.TypeId]: Subscribable.TypeId = Subscribable.TypeId
+    readonly [Ref.RefTypeId] = refVariance
+    readonly [SynchronizedRef.SynchronizedRefTypeId] = synchronizedRefVariance
+    readonly [SubscriptionRef.SubscriptionRefTypeId] = subscriptionRefVariance
+    readonly [SubscriptionSubRefTypeId] = subscriptionSubRefVariance
+
+    readonly get: Effect.Effect<A>
+
+    constructor(
+        readonly parent: B,
+        readonly getter: (parentValue: Effect.Effect.Success<B>) => A,
+        readonly setter: (parentValue: Effect.Effect.Success<B>, value: A) => Effect.Effect.Success<B>,
+    ) {
+        super()
+        this.get = Effect.map(this.parent, this.getter)
+    }
+
+    commit() {
+        return this.get
+    }
+
+    get changes(): Stream.Stream<A> {
+        return Stream.unwrap(
+            Effect.map(this.get, a => Stream.concat(
+                Stream.make(a),
+                Stream.map(this.parent.changes, this.getter),
+            ))
+        )
+    }
+
+    modify<C>(f: (a: A) => readonly [C, A]): Effect.Effect<C> {
+        return this.modifyEffect(a => Effect.succeed(f(a)))
+    }
+
+    modifyEffect<C, E, R>(f: (a: A) => Effect.Effect<readonly [C, A], E, R>): Effect.Effect<C, E, R> {
+        return Effect.Do.pipe(
+            Effect.bind("b", (): Effect.Effect<Effect.Effect.Success<B>> => this.parent),
+            Effect.bind("ca", ({ b }) => f(this.getter(b))),
+            Effect.tap(({ b, ca: [, a] }) => SubscriptionRef.set(this.parent, this.setter(b, a))),
+            Effect.map(({ ca: [c] }) => c),
+        )
+    }
+}
+
+
+export const isSubscriptionSubRef = (u: unknown): u is SubscriptionSubRef<unknown, SubscriptionRef.SubscriptionRef<unknown>> => Predicate.hasProperty(u, SubscriptionSubRefTypeId)
+
+export const makeFromGetSet = <A, B extends SubscriptionRef.SubscriptionRef<any>>(
+    parent: B,
+    options: {
+        readonly get: (parentValue: Effect.Effect.Success<B>) => A
+        readonly set: (parentValue: Effect.Effect.Success<B>, value: A) => Effect.Effect.Success<B>
+    },
+): SubscriptionSubRef<A, B> => new SubscriptionSubRefImpl(parent, options.get, options.set)
+
+export const makeFromPath = <
+    B extends SubscriptionRef.SubscriptionRef<any>,
+    const P extends PropertyPath.Paths<Effect.Effect.Success<B>>,
+>(
+    parent: B,
+    path: P,
+): SubscriptionSubRef<PropertyPath.ValueFromPath<Effect.Effect.Success<B>, P>, B> => new SubscriptionSubRefImpl(
+    parent,
+    parentValue => Option.getOrThrow(PropertyPath.get(parentValue, path)),
+    (parentValue, value) => Option.getOrThrow(PropertyPath.immutableSet(parentValue, path, value)),
+)
+
+export const makeFromChunkIndex: {
+    <B extends SubscriptionRef.SubscriptionRef<Chunk.NonEmptyChunk<any>>>(
+        parent: B,
+        index: number,
+    ): SubscriptionSubRef<
+        Effect.Effect.Success<B> extends Chunk.NonEmptyChunk<infer A> ? A : never,
+        B
+    >
+    <B extends SubscriptionRef.SubscriptionRef<Chunk.Chunk<any>>>(
+        parent: B,
+        index: number,
+    ): SubscriptionSubRef<
+        Effect.Effect.Success<B> extends Chunk.Chunk<infer A> ? A : never,
+        B
+    >
+} = (
+    parent: SubscriptionRef.SubscriptionRef<Chunk.Chunk<any>>,
+    index: number,
+) => new SubscriptionSubRefImpl(
+    parent,
+    parentValue => Chunk.unsafeGet(parentValue, index),
+    (parentValue, value) => Chunk.replace(parentValue, index, value),
+) as any
+
+export const makeFromChunkFindFirst: {
+    <B extends SubscriptionRef.SubscriptionRef<Chunk.NonEmptyChunk<any>>>(
+        parent: B,
+        findFirstPredicate: Predicate.Predicate<Effect.Effect.Success<B> extends Chunk.NonEmptyChunk<infer A> ? A : never>,
+    ): SubscriptionSubRef<
+        Effect.Effect.Success<B> extends Chunk.NonEmptyChunk<infer A> ? A : never,
+        B
+    >
+    <B extends SubscriptionRef.SubscriptionRef<Chunk.Chunk<any>>>(
+        parent: B,
+        findFirstPredicate: Predicate.Predicate<Effect.Effect.Success<B> extends Chunk.Chunk<infer A> ? A : never>,
+    ): SubscriptionSubRef<
+        Effect.Effect.Success<B> extends Chunk.Chunk<infer A> ? A : never,
+        B
+    >
+} = (
+    parent: SubscriptionRef.SubscriptionRef<Chunk.Chunk<never>>,
+    findFirstPredicate: Predicate.Predicate.Any,
+) => new SubscriptionSubRefImpl(
+    parent,
+    parentValue => Option.getOrThrow(Chunk.findFirst(parentValue, findFirstPredicate)),
+    (parentValue, value) => Option.getOrThrow(Option.andThen(
+        Chunk.findFirstIndex(parentValue, findFirstPredicate),
+        index => Chunk.replace(parentValue, index, value),
+    )),
+) as any
+
+export const makeFromChunkFindLast: {
+    <B extends SubscriptionRef.SubscriptionRef<Chunk.NonEmptyChunk<any>>>(
+        parent: B,
+        findLastPredicate: Predicate.Predicate<Effect.Effect.Success<B> extends Chunk.NonEmptyChunk<infer A> ? A : never>,
+    ): SubscriptionSubRef<
+        Effect.Effect.Success<B> extends Chunk.NonEmptyChunk<infer A> ? A : never,
+        B
+    >
+    <B extends SubscriptionRef.SubscriptionRef<Chunk.Chunk<any>>>(
+        parent: B,
+        findLastPredicate: Predicate.Predicate<Effect.Effect.Success<B> extends Chunk.Chunk<infer A> ? A : never>,
+    ): SubscriptionSubRef<
+        Effect.Effect.Success<B> extends Chunk.Chunk<infer A> ? A : never,
+        B
+    >
+} = (
+    parent: SubscriptionRef.SubscriptionRef<Chunk.Chunk<never>>,
+    findLastPredicate: Predicate.Predicate.Any,
+) => new SubscriptionSubRefImpl(
+    parent,
+    parentValue => Option.getOrThrow(Chunk.findLast(parentValue, findLastPredicate)),
+    (parentValue, value) => Option.getOrThrow(Option.andThen(
+        Chunk.findLastIndex(parentValue, findLastPredicate),
+        index => Chunk.replace(parentValue, index, value),
+    )),
+) as any

packages/effect-fc/src/index.ts

@@ -1,3 +1,17 @@
+export * as Async from "./Async.js"
 export * as Component from "./Component.js"
-export * as Hook from "./Hook.js"
-export * as ReactManagedRuntime from "./ReactManagedRuntime.js"
+export * as ErrorObserver from "./ErrorObserver.js"
+export * as Form from "./Form.js"
+export * as Memoized from "./Memoized.js"
+export * as Mutation from "./Mutation.js"
+export * as PropertyPath from "./PropertyPath.js"
+export * as PubSub from "./PubSub.js"
+export * as Query from "./Query.js"
+export * as QueryClient from "./QueryClient.js"
+export * as ReactRuntime from "./ReactRuntime.js"
+export * as Result from "./Result.js"
+export * as SetStateAction from "./SetStateAction.js"
+export * as Stream from "./Stream.js"
+export * as Subscribable from "./Subscribable.js"
+export * as SubscriptionRef from "./SubscriptionRef.js"
+export * as SubscriptionSubRef from "./SubscriptionSubRef.js"

packages/effect-fc/src/types/SubscriptionSubRef.ts

@@ -1,111 +0,0 @@
-import { Chunk, Effect, Effectable, Option, Readable, Ref, Stream, Subscribable, SubscriptionRef, SynchronizedRef, type Types, type Unify } from "effect"
-import * as PropertyPath from "./PropertyPath.js"
-
-
-export const SubscriptionSubRefTypeId: unique symbol = Symbol.for("reffuse/types/SubscriptionSubRef")
-export type SubscriptionSubRefTypeId = typeof SubscriptionSubRefTypeId
-
-export interface SubscriptionSubRef<in out A, in out B> extends SubscriptionSubRef.Variance<A, B>, SubscriptionRef.SubscriptionRef<A> {
-    readonly parent: SubscriptionRef.SubscriptionRef<B>
-
-    readonly [Unify.typeSymbol]?: unknown
-    readonly [Unify.unifySymbol]?: SubscriptionSubRefUnify<this>
-    readonly [Unify.ignoreSymbol]?: SubscriptionSubRefUnifyIgnore
-}
-
-export declare namespace SubscriptionSubRef {
-    export interface Variance<in out A, in out B> {
-        readonly [SubscriptionSubRefTypeId]: {
-            readonly _A: Types.Invariant<A>
-            readonly _B: Types.Invariant<B>
-        }
-    }
-}
-
-export interface SubscriptionSubRefUnify<A extends { [Unify.typeSymbol]?: any }> extends SubscriptionRef.SubscriptionRefUnify<A> {
-    SubscriptionSubRef?: () => Extract<A[Unify.typeSymbol], SubscriptionSubRef<any, any>>
-}
-
-export interface SubscriptionSubRefUnifyIgnore extends SubscriptionRef.SubscriptionRefUnifyIgnore {
-    SubscriptionRef?: true
-}
-
-
-const refVariance = { _A: (_: any) => _ }
-const synchronizedRefVariance = { _A: (_: any) => _ }
-const subscriptionRefVariance = { _A: (_: any) => _ }
-const subscriptionSubRefVariance = { _A: (_: any) => _, _B: (_: any) => _ }
-
-class SubscriptionSubRefImpl<in out A, in out B> extends Effectable.Class<A> implements SubscriptionSubRef<A, B> {
-    readonly [Readable.TypeId]: Readable.TypeId = Readable.TypeId
-    readonly [Subscribable.TypeId]: Subscribable.TypeId = Subscribable.TypeId
-    readonly [Ref.RefTypeId] = refVariance
-    readonly [SynchronizedRef.SynchronizedRefTypeId] = synchronizedRefVariance
-    readonly [SubscriptionRef.SubscriptionRefTypeId] = subscriptionRefVariance
-    readonly [SubscriptionSubRefTypeId] = subscriptionSubRefVariance
-
-    readonly get: Effect.Effect<A>
-
-    constructor(
-        readonly parent: SubscriptionRef.SubscriptionRef<B>,
-        readonly getter: (parentValue: B) => A,
-        readonly setter: (parentValue: B, value: A) => B,
-    ) {
-        super()
-        this.get = Effect.map(this.parent, this.getter)
-    }
-
-    commit() {
-        return this.get
-    }
-
-    get changes(): Stream.Stream<A> {
-        return this.get.pipe(
-            Effect.map(a => this.parent.changes.pipe(
-                Stream.map(this.getter),
-                s => Stream.concat(Stream.make(a), s),
-            )),
-            Stream.unwrap,
-        )
-    }
-
-    modify<C>(f: (a: A) => readonly [C, A]): Effect.Effect<C> {
-        return this.modifyEffect(a => Effect.succeed(f(a)))
-    }
-
-    modifyEffect<C, E, R>(f: (a: A) => Effect.Effect<readonly [C, A], E, R>): Effect.Effect<C, E, R> {
-        return Effect.Do.pipe(
-            Effect.bind("b", () => Ref.get(this.parent)),
-            Effect.bind("ca", ({ b }) => f(this.getter(b))),
-            Effect.tap(({ b, ca: [, a] }) => Ref.set(this.parent, this.setter(b, a))),
-            Effect.map(({ ca: [c] }) => c),
-        )
-    }
-}
-
-
-export const makeFromGetSet = <A, B>(
-    parent: SubscriptionRef.SubscriptionRef<B>,
-    options: {
-        readonly get: (parentValue: B) => A
-        readonly set: (parentValue: B, value: A) => B
-    },
-): SubscriptionSubRef<A, B> => new SubscriptionSubRefImpl(parent, options.get, options.set)
-
-export const makeFromPath = <B, const P extends PropertyPath.Paths<B>>(
-    parent: SubscriptionRef.SubscriptionRef<B>,
-    path: P,
-): SubscriptionSubRef<PropertyPath.ValueFromPath<B, P>, B> => new SubscriptionSubRefImpl(
-    parent,
-    parentValue => Option.getOrThrow(PropertyPath.get(parentValue, path)),
-    (parentValue, value) => Option.getOrThrow(PropertyPath.immutableSet(parentValue, path, value)),
-)
-
-export const makeFromChunkRef = <A>(
-    parent: SubscriptionRef.SubscriptionRef<Chunk.Chunk<A>>,
-    index: number,
-): SubscriptionSubRef<A, Chunk.Chunk<A>> => new SubscriptionSubRefImpl(
-    parent,
-    parentValue => Chunk.unsafeGet(parentValue, index),
-    (parentValue, value) => Chunk.replace(parentValue, index, value),
-)

packages/effect-fc/src/types/index.ts

@@ -1,3 +0,0 @@
-export * as PropertyPath from "./PropertyPath.js"
-export * as SetStateAction from "./SetStateAction.js"
-export * as SubscriptionSubRef from "./SubscriptionSubRef.js"

packages/effect-fc/src/utils.ts

@@ -0,0 +1,3 @@
+export type ExcludeKeys<T, K extends PropertyKey> = K extends keyof T ? (
+    { [P in K]?: never } & Omit<T, K>
+) : T

packages/effect-fc/tsconfig.json

@@ -26,7 +26,12 @@
 
     // Build
     "outDir": "./dist",
-    "declaration": true
+    "declaration": true,
+    "sourceMap": true,
+
+    "plugins": [
+      { "name": "@effect/language-service" }
+    ]
   },
 
   "include": ["./src"]

packages/example/.gitignore

@@ -22,3 +22,5 @@ dist-ssr
 *.njsproj
 *.sln
 *.sw?
+
+.tanstack

packages/example/biome.json

@@ -0,0 +1,8 @@
+{
+  "$schema": "https://biomejs.dev/schemas/latest/schema.json",
+  "root": false,
+  "extends": "//",
+  "files": {
+    "includes": ["./src/**", "!src/routeTree.gen.ts"]
+  }
+}

packages/example/eslint.config.js

@@ -1,28 +0,0 @@
-import js from '@eslint/js'
-import globals from 'globals'
-import reactHooks from 'eslint-plugin-react-hooks'
-import reactRefresh from 'eslint-plugin-react-refresh'
-import tseslint from 'typescript-eslint'
-
-export default tseslint.config(
-  { ignores: ['dist'] },
-  {
-    extends: [js.configs.recommended, ...tseslint.configs.recommended],
-    files: ['**/*.{ts,tsx}'],
-    languageOptions: {
-      ecmaVersion: 2020,
-      globals: globals.browser,
-    },
-    plugins: {
-      'react-hooks': reactHooks,
-      'react-refresh': reactRefresh,
-    },
-    rules: {
-      ...reactHooks.configs.recommended.rules,
-      'react-refresh/only-export-components': [
-        'warn',
-        { allowConstantExport: true },
-      ],
-    },
-  },
-)

packages/example/package.json

@@ -5,48 +5,38 @@
   "private": true,
   "scripts": {
     "dev": "vite",
-    "build": "tsc -b && vite build",
     "lint:tsc": "tsc --noEmit",
-    "lint:eslint": "eslint .",
-    "preview": "vite preview"
+    "lint:biome": "biome lint",
+    "preview": "vite preview",
+    "clean:cache": "rm -rf .turbo node_modules/.tmp node_modules/.vite* .tanstack",
+    "clean:dist": "rm -rf dist",
+    "clean:modules": "rm -rf node_modules"
   },
   "devDependencies": {
-    "@effect/language-service": "^0.23.4",
-    "@eslint/js": "^9.26.0",
-    "@tanstack/react-router": "^1.120.3",
-    "@tanstack/react-router-devtools": "^1.120.3",
-    "@tanstack/router-plugin": "^1.120.3",
-    "@thilawyn/thilaschema": "^0.1.4",
-    "@types/react": "^19.1.4",
-    "@types/react-dom": "^19.1.5",
-    "@vitejs/plugin-react": "^4.4.1",
-    "eslint": "^9.26.0",
-    "eslint-plugin-react-hooks": "^5.2.0",
-    "eslint-plugin-react-refresh": "^0.4.20",
-    "globals": "^16.1.0",
-    "react": "^19.1.0",
-    "react-dom": "^19.1.0",
-    "typescript-eslint": "^8.32.1",
-    "vite": "^6.3.5"
+    "@tanstack/react-router": "^1.139.12",
+    "@tanstack/react-router-devtools": "^1.139.12",
+    "@tanstack/router-plugin": "^1.139.12",
+    "@types/react": "^19.2.7",
+    "@types/react-dom": "^19.2.3",
+    "@vitejs/plugin-react": "^5.1.1",
+    "globals": "^17.0.0",
+    "react": "^19.2.0",
+    "react-dom": "^19.2.0",
+    "type-fest": "^5.2.0",
+    "vite": "^7.2.6"
   },
   "dependencies": {
-    "@effect/platform": "^0.82.1",
-    "@effect/platform-browser": "^0.62.1",
+    "@effect/platform": "^0.94.0",
+    "@effect/platform-browser": "^0.74.0",
     "@radix-ui/themes": "^3.2.1",
-    "@typed/async-data": "^0.13.1",
     "@typed/id": "^0.17.2",
-    "@typed/lazy-ref": "^0.3.3",
-    "effect": "^3.15.1",
+    "effect": "^3.19.8",
     "effect-fc": "workspace:*",
-    "lucide-react": "^0.510.0",
-    "mobx": "^6.13.7",
     "react-icons": "^5.5.0"
   },
   "overrides": {
-    "effect": "^3.15.1",
-    "@effect/platform": "^0.82.1",
-    "@effect/platform-browser": "^0.62.1",
-    "@typed/lazy-ref": "^0.3.3",
-    "@typed/async-data": "^0.13.1"
+    "@types/react": "^19.2.7",
+    "effect": "^3.19.8",
+    "react": "^19.2.0"
   }
 }

packages/example/src/domain/Todo.ts

@@ -1,5 +1,5 @@
-import { ThSchema } from "@thilawyn/thilaschema"
 import { Schema } from "effect"
+import { assertEncodedJsonifiable } from "@/lib/schema"
 
 
 export class Todo extends Schema.Class<Todo>("Todo")({
@@ -14,7 +14,7 @@ export const TodoFromJsonStruct = Schema.Struct({
     ...Todo.fields,
     completedAt: Schema.Option(Schema.DateTimeUtc),
 }).pipe(
-    ThSchema.assertEncodedJsonifiable
+    assertEncodedJsonifiable
 )
 
 export const TodoFromJson = Schema.compose(TodoFromJsonStruct, Todo)

packages/example/src/lib/form/TextFieldFormInput.tsx

@@ -0,0 +1,75 @@
+import { Callout, Flex, Spinner, Switch, TextField } from "@radix-ui/themes"
+import { Array, Option, Struct } from "effect"
+import { Component, Form, Subscribable } from "effect-fc"
+
+
+interface Props
+extends TextField.RootProps, Form.useInput.Options {
+    readonly optional?: false
+    readonly field: Form.FormField<any, string>
+}
+
+interface OptionalProps
+extends Omit<TextField.RootProps, "optional" | "defaultValue">, Form.useOptionalInput.Options<string> {
+    readonly optional: true
+    readonly field: Form.FormField<any, Option.Option<string>>
+}
+
+export type TextFieldFormInputProps = Props | OptionalProps
+
+
+export class TextFieldFormInput extends Component.makeUntraced("TextFieldFormInput")(function*(props: TextFieldFormInputProps) {
+    const input: (
+        | { readonly optional: true } & Form.useOptionalInput.Success<string>
+        | { readonly optional: false } & Form.useInput.Success<string>
+    ) = props.optional
+        // biome-ignore lint/correctness/useHookAtTopLevel: "optional" reactivity not supported
+        ? { optional: true, ...yield* Form.useOptionalInput(props.field, props) }
+        // biome-ignore lint/correctness/useHookAtTopLevel: "optional" reactivity not supported
+        : { optional: false, ...yield* Form.useInput(props.field, props) }
+
+    const [issues, isValidating, isSubmitting] = yield* Subscribable.useSubscribables([
+        props.field.issues,
+        props.field.isValidating,
+        props.field.isSubmitting,
+    ])
+
+    return (
+        <Flex direction="column" gap="1">
+            <TextField.Root
+                value={input.value}
+                onChange={e => input.setValue(e.target.value)}
+                disabled={(input.optional && !input.enabled) || isSubmitting}
+                {...Struct.omit(props, "optional", "defaultValue")}
+            >
+                {input.optional &&
+                    <TextField.Slot side="left">
+                        <Switch
+                            size="1"
+                            checked={input.enabled}
+                            onCheckedChange={input.setEnabled}
+                        />
+                    </TextField.Slot>
+                }
+
+                {isValidating &&
+                    <TextField.Slot side="right">
+                        <Spinner />
+                    </TextField.Slot>
+                }
+
+                {props.children}
+            </TextField.Root>
+
+            {Option.match(Array.head(issues), {
+                onSome: issue => (
+                    <Callout.Root>
+                        <Callout.Text>{issue.message}</Callout.Text>
+                    </Callout.Root>
+                ),
+
+                onNone: () => <></>,
+            })}
+        </Flex>
+    )
+}) {}

packages/example/src/lib/schema/datetime.ts

@@ -0,0 +1,38 @@
+import { DateTime, Effect, Option, ParseResult, Schema } from "effect"
+
+
+export class DateTimeUtcFromZoned extends Schema.transformOrFail(
+    Schema.DateTimeZonedFromSelf,
+    Schema.DateTimeUtcFromSelf,
+    {
+        strict: true,
+        encode: DateTime.setZoneCurrent,
+        decode: i => ParseResult.succeed(DateTime.toUtc(i)),
+    },
+) {}
+
+export class DateTimeZonedFromUtc extends Schema.transformOrFail(
+    Schema.DateTimeUtcFromSelf,
+    Schema.DateTimeZonedFromSelf,
+    {
+        strict: true,
+        encode: a => ParseResult.succeed(DateTime.toUtc(a)),
+        decode: DateTime.setZoneCurrent,
+    },
+) {}
+
+export class DateTimeUtcFromZonedInput extends Schema.transformOrFail(
+    Schema.String,
+    DateTimeUtcFromZoned,
+    {
+        strict: true,
+        encode: a => ParseResult.succeed(DateTime.formatIsoZoned(a).slice(0, 16)),
+        decode: (i, _, ast) => Effect.flatMap(
+            DateTime.CurrentTimeZone,
+            timeZone => Option.match(DateTime.makeZoned(i, { timeZone, adjustForTimeZone: true }), {
+                onSome: ParseResult.succeed,
+                onNone: () => ParseResult.fail(new ParseResult.Type(ast, i, `Unable to decode ${JSON.stringify(i)} into a DateTime.Zoned`)),
+            }),
+        ),
+    },
+) {}

packages/example/src/lib/schema/index.ts

@@ -0,0 +1,2 @@
+export * from "./datetime"
+export * from "./json"

packages/example/src/lib/schema/json.ts

@@ -0,0 +1,6 @@
+import type { Schema } from "effect"
+import type { JsonValue } from "type-fest"
+
+
+export const assertEncodedJsonifiable = <S extends Schema.Schema<A, I, R>, A, I extends JsonValue, R>(schema: S & Schema.Schema<A, I, R>): S => schema
+export const assertTypeJsonifiable = <S extends Schema.Schema<A, I, R>, A extends JsonValue, I, R>(schema: S & Schema.Schema<A, I, R>): S => schema

packages/example/src/main.tsx

@@ -1,5 +1,5 @@
 import { createRouter, RouterProvider } from "@tanstack/react-router"
-import { ReactManagedRuntime } from "effect-fc"
+import { ReactRuntime } from "effect-fc"
 import { StrictMode } from "react"
 import { createRoot } from "react-dom/client"
 import { routeTree } from "./routeTree.gen"
@@ -14,10 +14,11 @@ declare module "@tanstack/react-router" {
     }
 }
 
+// biome-ignore lint/style/noNonNullAssertion: React entrypoint
 createRoot(document.getElementById("root")!).render(
     <StrictMode>
-        <ReactManagedRuntime.Provider runtime={runtime}>
+        <ReactRuntime.Provider runtime={runtime}>
             <RouterProvider router={router} />
-        </ReactManagedRuntime.Provider>
+        </ReactRuntime.Provider>
     </StrictMode>
 )

packages/example/src/routeTree.gen.ts

@@ -9,9 +9,30 @@
 // Additionally, you should also exclude this file from your linter and/or formatter to prevent it from being checked or modified.
 
 import { Route as rootRouteImport } from './routes/__root'
+import { Route as ResultRouteImport } from './routes/result'
+import { Route as QueryRouteImport } from './routes/query'
+import { Route as FormRouteImport } from './routes/form'
 import { Route as BlankRouteImport } from './routes/blank'
 import { Route as IndexRouteImport } from './routes/index'
+import { Route as DevMemoRouteImport } from './routes/dev/memo'
+import { Route as DevContextRouteImport } from './routes/dev/context'
+import { Route as DevAsyncRenderingRouteImport } from './routes/dev/async-rendering'
 
+const ResultRoute = ResultRouteImport.update({
+  id: '/result',
+  path: '/result',
+  getParentRoute: () => rootRouteImport,
+} as any)
+const QueryRoute = QueryRouteImport.update({
+  id: '/query',
+  path: '/query',
+  getParentRoute: () => rootRouteImport,
+} as any)
+const FormRoute = FormRouteImport.update({
+  id: '/form',
+  path: '/form',
+  getParentRoute: () => rootRouteImport,
+} as any)
 const BlankRoute = BlankRouteImport.update({
   id: '/blank',
   path: '/blank',
@@ -22,35 +43,120 @@ const IndexRoute = IndexRouteImport.update({
   path: '/',
   getParentRoute: () => rootRouteImport,
 } as any)
+const DevMemoRoute = DevMemoRouteImport.update({
+  id: '/dev/memo',
+  path: '/dev/memo',
+  getParentRoute: () => rootRouteImport,
+} as any)
+const DevContextRoute = DevContextRouteImport.update({
+  id: '/dev/context',
+  path: '/dev/context',
+  getParentRoute: () => rootRouteImport,
+} as any)
+const DevAsyncRenderingRoute = DevAsyncRenderingRouteImport.update({
+  id: '/dev/async-rendering',
+  path: '/dev/async-rendering',
+  getParentRoute: () => rootRouteImport,
+} as any)
 
 export interface FileRoutesByFullPath {
   '/': typeof IndexRoute
   '/blank': typeof BlankRoute
+  '/form': typeof FormRoute
+  '/query': typeof QueryRoute
+  '/result': typeof ResultRoute
+  '/dev/async-rendering': typeof DevAsyncRenderingRoute
+  '/dev/context': typeof DevContextRoute
+  '/dev/memo': typeof DevMemoRoute
 }
 export interface FileRoutesByTo {
   '/': typeof IndexRoute
   '/blank': typeof BlankRoute
+  '/form': typeof FormRoute
+  '/query': typeof QueryRoute
+  '/result': typeof ResultRoute
+  '/dev/async-rendering': typeof DevAsyncRenderingRoute
+  '/dev/context': typeof DevContextRoute
+  '/dev/memo': typeof DevMemoRoute
 }
 export interface FileRoutesById {
   __root__: typeof rootRouteImport
   '/': typeof IndexRoute
   '/blank': typeof BlankRoute
+  '/form': typeof FormRoute
+  '/query': typeof QueryRoute
+  '/result': typeof ResultRoute
+  '/dev/async-rendering': typeof DevAsyncRenderingRoute
+  '/dev/context': typeof DevContextRoute
+  '/dev/memo': typeof DevMemoRoute
 }
 export interface FileRouteTypes {
   fileRoutesByFullPath: FileRoutesByFullPath
-  fullPaths: '/' | '/blank'
+  fullPaths:
+    | '/'
+    | '/blank'
+    | '/form'
+    | '/query'
+    | '/result'
+    | '/dev/async-rendering'
+    | '/dev/context'
+    | '/dev/memo'
   fileRoutesByTo: FileRoutesByTo
-  to: '/' | '/blank'
-  id: '__root__' | '/' | '/blank'
+  to:
+    | '/'
+    | '/blank'
+    | '/form'
+    | '/query'
+    | '/result'
+    | '/dev/async-rendering'
+    | '/dev/context'
+    | '/dev/memo'
+  id:
+    | '__root__'
+    | '/'
+    | '/blank'
+    | '/form'
+    | '/query'
+    | '/result'
+    | '/dev/async-rendering'
+    | '/dev/context'
+    | '/dev/memo'
   fileRoutesById: FileRoutesById
 }
 export interface RootRouteChildren {
   IndexRoute: typeof IndexRoute
   BlankRoute: typeof BlankRoute
+  FormRoute: typeof FormRoute
+  QueryRoute: typeof QueryRoute
+  ResultRoute: typeof ResultRoute
+  DevAsyncRenderingRoute: typeof DevAsyncRenderingRoute
+  DevContextRoute: typeof DevContextRoute
+  DevMemoRoute: typeof DevMemoRoute
 }
 
 declare module '@tanstack/react-router' {
   interface FileRoutesByPath {
+    '/result': {
+      id: '/result'
+      path: '/result'
+      fullPath: '/result'
+      preLoaderRoute: typeof ResultRouteImport
+      parentRoute: typeof rootRouteImport
+    }
+    '/query': {
+      id: '/query'
+      path: '/query'
+      fullPath: '/query'
+      preLoaderRoute: typeof QueryRouteImport
+      parentRoute: typeof rootRouteImport
+    }
+    '/form': {
+      id: '/form'
+      path: '/form'
+      fullPath: '/form'
+      preLoaderRoute: typeof FormRouteImport
+      parentRoute: typeof rootRouteImport
+    }
     '/blank': {
       id: '/blank'
       path: '/blank'
@@ -65,12 +171,39 @@ declare module '@tanstack/react-router' {
       preLoaderRoute: typeof IndexRouteImport
       parentRoute: typeof rootRouteImport
     }
+    '/dev/memo': {
+      id: '/dev/memo'
+      path: '/dev/memo'
+      fullPath: '/dev/memo'
+      preLoaderRoute: typeof DevMemoRouteImport
+      parentRoute: typeof rootRouteImport
+    }
+    '/dev/context': {
+      id: '/dev/context'
+      path: '/dev/context'
+      fullPath: '/dev/context'
+      preLoaderRoute: typeof DevContextRouteImport
+      parentRoute: typeof rootRouteImport
+    }
+    '/dev/async-rendering': {
+      id: '/dev/async-rendering'
+      path: '/dev/async-rendering'
+      fullPath: '/dev/async-rendering'
+      preLoaderRoute: typeof DevAsyncRenderingRouteImport
+      parentRoute: typeof rootRouteImport
+    }
   }
 }
 
 const rootRouteChildren: RootRouteChildren = {
   IndexRoute: IndexRoute,
   BlankRoute: BlankRoute,
+  FormRoute: FormRoute,
+  QueryRoute: QueryRoute,
+  ResultRoute: ResultRoute,
+  DevAsyncRenderingRoute: DevAsyncRenderingRoute,
+  DevContextRoute: DevContextRoute,
+  DevMemoRoute: DevMemoRoute,
 }
 export const routeTree = rootRouteImport
   ._addFileChildren(rootRouteChildren)

packages/example/src/routes/dev/async-rendering.tsx

@@ -0,0 +1,78 @@
+import { Flex, Text, TextField } from "@radix-ui/themes"
+import { createFileRoute } from "@tanstack/react-router"
+import { GetRandomValues, makeUuid4 } from "@typed/id"
+import { Effect } from "effect"
+import { Async, Component, Memoized } from "effect-fc"
+import * as React from "react"
+import { runtime } from "@/runtime"
+
+
+// Generator version
+const RouteComponent = Component.makeUntraced(function* AsyncRendering() {
+    const MemoizedAsyncComponentFC = yield* MemoizedAsyncComponent
+    const AsyncComponentFC = yield* AsyncComponent
+    const [input, setInput] = React.useState("")
+
+    return (
+        <Flex direction="column" align="stretch" gap="2">
+            <TextField.Root
+                value={input}
+                onChange={e => setInput(e.target.value)}
+            />
+
+            <MemoizedAsyncComponentFC fallback={React.useMemo(() => <p>Loading memoized...</p>, [])} />
+            <AsyncComponentFC />
+        </Flex>
+    )
+}).pipe(
+    Component.withRuntime(runtime.context)
+)
+
+// Pipeline version
+// const RouteComponent = Component.make("RouteComponent")(() => Effect.Do,
+//     Effect.bind("VMemoizedAsyncComponent", () => Component.useFC(MemoizedAsyncComponent)),
+//     Effect.bind("VAsyncComponent", () => Component.useFC(AsyncComponent)),
+//     Effect.let("input", () => React.useState("")),
+
+//     Effect.map(({ input: [input, setInput], VAsyncComponent, VMemoizedAsyncComponent }) =>
+//         <Flex direction="column" align="stretch" gap="2">
+//             <TextField.Root
+//                 value={input}
+//                 onChange={e => setInput(e.target.value)}
+//             />
+
+//             <VMemoizedAsyncComponent />
+//             <VAsyncComponent />
+//         </Flex>
+//     ),
+// ).pipe(
+//     Component.withRuntime(runtime.context)
+// )
+
+
+class AsyncComponent extends Component.makeUntraced("AsyncComponent")(function*() {
+    const SubComponentFC = yield* SubComponent
+
+    yield* Effect.sleep("500 millis") // Async operation
+    // Cannot use React hooks after the async operation
+
+    return (
+        <Flex direction="column" align="stretch">
+            <Text>Rendered!</Text>
+            <SubComponentFC />
+        </Flex>
+    )
+}).pipe(
+    Async.async,
+    Async.withOptions({ defaultFallback: <p>Loading...</p> }),
+) {}
+class MemoizedAsyncComponent extends Memoized.memoized(AsyncComponent) {}
+
+class SubComponent extends Component.makeUntraced("SubComponent")(function*() {
+    const [state] = React.useState(yield* Component.useOnMount(() => Effect.provide(makeUuid4, GetRandomValues.CryptoRandom)))
+    return <Text>{state}</Text>
+}) {}
+
+export const Route = createFileRoute("/dev/async-rendering")({
+    component: RouteComponent
+})

packages/example/src/routes/dev/context.tsx

@@ -0,0 +1,42 @@
+import { Container, Flex, Text, TextField } from "@radix-ui/themes"
+import { createFileRoute } from "@tanstack/react-router"
+import { Console, Effect } from "effect"
+import { Component } from "effect-fc"
+import * as React from "react"
+import { runtime } from "@/runtime"
+
+
+class SubService extends Effect.Service<SubService>()("SubService", {
+    effect: (value: string) => Effect.succeed({ value })
+}) {}
+
+const SubComponent = Component.makeUntraced("SubComponent")(function*() {
+    const service = yield* SubService
+    yield* Component.useOnMount(() => Effect.gen(function*() {
+        yield* Effect.addFinalizer(() => Console.log("SubComponent unmounted"))
+        yield* Console.log("SubComponent mounted")
+    }))
+
+    return <Text>{service.value}</Text>
+})
+
+const ContextView = Component.makeUntraced("ContextView")(function*() {
+    const [serviceValue, setServiceValue] = React.useState("test")
+    const SubServiceLayer = React.useMemo(() => SubService.Default(serviceValue), [serviceValue])
+    const SubComponentFC = yield* Effect.provide(SubComponent, yield* Component.useContext(SubServiceLayer))
+
+    return (
+        <Container>
+            <Flex direction="column" align="center">
+                <TextField.Root value={serviceValue} onChange={e => setServiceValue(e.target.value)} />
+                <SubComponentFC />
+            </Flex>
+        </Container>
+    )
+}).pipe(
+    Component.withRuntime(runtime.context)
+)
+
+export const Route = createFileRoute("/dev/context")({
+    component: ContextView
+})

packages/example/src/routes/dev/memo.tsx

@@ -0,0 +1,37 @@
+import { Flex, Text, TextField } from "@radix-ui/themes"
+import { createFileRoute } from "@tanstack/react-router"
+import { GetRandomValues, makeUuid4 } from "@typed/id"
+import { Effect } from "effect"
+import { Component, Memoized } from "effect-fc"
+import * as React from "react"
+import { runtime } from "@/runtime"
+
+
+const RouteComponent = Component.makeUntraced("RouteComponent")(function*() {
+    const [value, setValue] = React.useState("")
+
+    return (
+        <Flex direction="column" gap="2">
+            <TextField.Root
+                value={value}
+                onChange={e => setValue(e.target.value)}
+            />
+
+            {yield* Effect.map(SubComponent, FC => <FC />)}
+            {yield* Effect.map(MemoizedSubComponent, FC => <FC />)}
+        </Flex>
+    )
+}).pipe(
+    Component.withRuntime(runtime.context)
+)
+
+class SubComponent extends Component.makeUntraced("SubComponent")(function*() {
+    const id = yield* makeUuid4.pipe(Effect.provide(GetRandomValues.CryptoRandom))
+    return <Text>{id}</Text>
+}) {}
+
+class MemoizedSubComponent extends Memoized.memoized(SubComponent) {}
+
+export const Route = createFileRoute("/dev/memo")({
+    component: RouteComponent,
+})

packages/example/src/routes/form.tsx

@@ -0,0 +1,132 @@
+import { Button, Container, Flex, Text } from "@radix-ui/themes"
+import { createFileRoute } from "@tanstack/react-router"
+import { Console, Effect, Match, Option, ParseResult, Schema } from "effect"
+import { Component, Form, Subscribable } from "effect-fc"
+import { TextFieldFormInput } from "@/lib/form/TextFieldFormInput"
+import { DateTimeUtcFromZonedInput } from "@/lib/schema"
+import { runtime } from "@/runtime"
+
+
+const email = Schema.pattern<typeof Schema.String>(
+    /^(?!\.)(?!.*\.\.)([A-Z0-9_+-.]*)[A-Z0-9_+-]@([A-Z0-9][A-Z0-9-]*\.)+[A-Z]{2,}$/i,
+
+    {
+        identifier: "email",
+        title: "email",
+        message: () => "Not an email address",
+    },
+)
+
+const RegisterFormSchema = Schema.Struct({
+    email: Schema.String.pipe(email),
+    password: Schema.String.pipe(Schema.minLength(3)),
+    birth: Schema.OptionFromSelf(DateTimeUtcFromZonedInput),
+})
+
+const RegisterFormSubmitSchema = Schema.Struct({
+    email: Schema.transformOrFail(
+        Schema.String,
+        Schema.String,
+        {
+            decode: (input, _options, ast) => input !== "admin@admin.com"
+                ? ParseResult.succeed(input)
+                : ParseResult.fail(new ParseResult.Type(ast, input, "This email is already in use.")),
+            encode: ParseResult.succeed,
+        },
+    ),
+    password: Schema.String,
+    birth: Schema.OptionFromSelf(Schema.DateTimeUtcFromSelf),
+})
+
+class RegisterForm extends Effect.Service<RegisterForm>()("RegisterForm", {
+    scoped: Form.service({
+        schema: RegisterFormSchema.pipe(
+            Schema.compose(
+                Schema.transformOrFail(
+                    Schema.typeSchema(RegisterFormSchema),
+                    Schema.typeSchema(RegisterFormSchema),
+                    {
+                        decode: v => Effect.andThen(Effect.sleep("500 millis"), ParseResult.succeed(v)),
+                        encode: ParseResult.succeed,
+                    },
+                ),
+            ),
+        ),
+
+        initialEncodedValue: { email: "", password: "", birth: Option.none() },
+        f: Effect.fnUntraced(function*([value]) {
+            yield* Effect.sleep("500 millis")
+            return yield* Schema.decode(RegisterFormSubmitSchema)(value)
+        }),
+        debounce: "500 millis",
+    })
+}) {}
+
+class RegisterFormView extends Component.makeUntraced("RegisterFormView")(function*() {
+    const form = yield* RegisterForm
+    const [canSubmit, submitResult] = yield* Subscribable.useSubscribables([
+        form.canSubmit,
+        form.mutation.result,
+    ])
+
+    const runPromise = yield* Component.useRunPromise()
+    const TextFieldFormInputFC = yield* TextFieldFormInput
+
+    yield* Component.useOnMount(() => Effect.gen(function*() {
+        yield* Effect.addFinalizer(() => Console.log("RegisterFormView unmounted"))
+        yield* Console.log("RegisterFormView mounted")
+    }))
+
+
+    return (
+        <Container width="300">
+            <form onSubmit={e => {
+                e.preventDefault()
+                void runPromise(form.submit)
+            }}>
+                <Flex direction="column" gap="2">
+                    <TextFieldFormInputFC
+                        field={yield* form.field(["email"])}
+                    />
+
+                    <TextFieldFormInputFC
+                        field={yield* form.field(["password"])}
+                    />
+
+                    <TextFieldFormInputFC
+                        optional
+                        type="datetime-local"
+                        field={yield* form.field(["birth"])}
+                        defaultValue=""
+                    />
+
+                    <Button disabled={!canSubmit}>Submit</Button>
+                </Flex>
+            </form>
+
+            {Match.value(submitResult).pipe(
+                Match.tag("Initial", () => <></>),
+                Match.tag("Running", () => <Text>Submitting...</Text>),
+                Match.tag("Success", () => <Text>Submitted successfully!</Text>),
+                Match.tag("Failure", e => <Text>Error: {e.cause.toString()}</Text>),
+                Match.exhaustive,
+            )}
+        </Container>
+    )
+}) {}
+
+const RegisterPage = Component.makeUntraced("RegisterPage")(function*() {
+    const RegisterFormViewFC = yield* Effect.provide(
+        RegisterFormView,
+        yield* Component.useContext(RegisterForm.Default),
+    )
+
+    return <RegisterFormViewFC />
+}).pipe(
+    Component.withRuntime(runtime.context)
+)
+
+
+export const Route = createFileRoute("/form")({
+    component: RegisterPage
+})

packages/example/src/routes/index.tsx

@@ -1,22 +1,24 @@
+import { createFileRoute } from "@tanstack/react-router"
+import { Effect } from "effect"
+import { Component } from "effect-fc"
 import { runtime } from "@/runtime"
 import { Todos } from "@/todo/Todos"
 import { TodosState } from "@/todo/TodosState.service"
-import { createFileRoute } from "@tanstack/react-router"
-import { Effect } from "effect"
-import { Component, Hook } from "effect-fc"
 
 
 const TodosStateLive = TodosState.Default("todos")
 
+const Index = Component.makeUntraced("Index")(function*() {
+    const TodosFC = yield* Effect.provide(
+        Todos,
+        yield* Component.useContext(TodosStateLive),
+    )
+
+    return <TodosFC />
+}).pipe(
+    Component.withRuntime(runtime.context)
+)
+
 export const Route = createFileRoute("/")({
-    component: Component.make(function* Index() {
-        return yield* Effect.provide(
-            Component.use(Todos, Todos => <Todos />),
-            yield* Hook.useMemoLayer(TodosStateLive),
-        )
-    }, {
-        finalizerExecutionMode: "fork"
-    }).pipe(
-        Component.withRuntime(runtime.context),
-    )
+    component: Index
 })

packages/example/src/routes/query.tsx

@@ -0,0 +1,116 @@
+import { HttpClient, type HttpClientError } from "@effect/platform"
+import { Button, Container, Flex, Heading, Slider, Text } from "@radix-ui/themes"
+import { createFileRoute } from "@tanstack/react-router"
+import { Array, Cause, Chunk, Console, Effect, flow, Match, Option, Schema, Stream } from "effect"
+import { Component, ErrorObserver, Mutation, Query, Result, Subscribable, SubscriptionRef } from "effect-fc"
+import { runtime } from "@/runtime"
+
+
+const Post = Schema.Struct({
+    userId: Schema.Int,
+    id: Schema.Int,
+    title: Schema.String,
+    body: Schema.String,
+})
+
+const ResultView = Component.makeUntraced("Result")(function*() {
+    const runPromise = yield* Component.useRunPromise()
+
+    const [idRef, query, mutation] = yield* Component.useOnMount(() => Effect.gen(function*() {
+        const idRef = yield* SubscriptionRef.make(1)
+
+        const query = yield* Query.service({
+            key: Stream.zipLatest(Stream.make("posts" as const), idRef.changes),
+            f: ([, id]) => HttpClient.HttpClient.pipe(
+                Effect.tap(Effect.sleep("500 millis")),
+                Effect.andThen(client => client.get(`https://jsonplaceholder.typicode.com/posts/${ id }`)),
+                Effect.andThen(response => response.json),
+                Effect.andThen(Schema.decodeUnknown(Post)),
+            ),
+            staleTime: "10 seconds",
+        })
+
+        const mutation = yield* Mutation.make({
+            f: ([id]: readonly [id: number]) => HttpClient.HttpClient.pipe(
+                Effect.tap(Effect.sleep("500 millis")),
+                Effect.andThen(client => client.get(`https://jsonplaceholder.typicode.com/posts/${ id }`)),
+                Effect.andThen(response => response.json),
+                Effect.andThen(Schema.decodeUnknown(Post)),
+            ),
+        })
+
+        return [idRef, query, mutation] as const
+    }))
+
+    const [id, setId] = yield* SubscriptionRef.useSubscriptionRefState(idRef)
+    const [queryResult, mutationResult] = yield* Subscribable.useSubscribables([query.result, mutation.result])
+
+    yield* Component.useOnMount(() => ErrorObserver.ErrorObserver<HttpClientError.HttpClientError>().pipe(
+        Effect.andThen(observer => observer.subscribe),
+        Effect.andThen(Stream.fromQueue),
+        Stream.unwrapScoped,
+        Stream.runForEach(flow(
+            Cause.failures,
+            Chunk.findFirst(e => e._tag === "RequestError" || e._tag === "ResponseError"),
+            Option.match({
+                onSome: e => Console.log("ResultView HttpClient error", e),
+                onNone: () => Effect.void,
+            }),
+        )),
+        Effect.forkScoped,
+    ))
+
+    return (
+        <Container>
+            <Flex direction="column" align="center" gap="2">
+                <Slider
+                    value={[id]}
+                    onValueChange={flow(Array.head, Option.getOrThrow, setId)}
+                />
+
+                <div>
+                    {Match.value(queryResult).pipe(
+                        Match.tag("Running", () => <Text>Loading...</Text>),
+                        Match.tag("Success", result => <>
+                            <Heading>{result.value.title}</Heading>
+                            <Text>{result.value.body}</Text>
+                            {Result.hasRefreshingFlag(result) && <Text>Refreshing...</Text>}
+                        </>),
+                        Match.tag("Failure", result =>
+                            <Text>An error has occured: {result.cause.toString()}</Text>
+                        ),
+                        Match.orElse(() => <></>),
+                    )}
+                </div>
+
+                <Flex direction="row" justify="center" align="center" gap="1">
+                    <Button onClick={() => runPromise(query.refresh)}>Refresh</Button>
+                    <Button onClick={() => runPromise(query.invalidateCache)}>Invalidate cache</Button>
+                </Flex>
+
+                <div>
+                    {Match.value(mutationResult).pipe(
+                        Match.tag("Running", () => <Text>Loading...</Text>),
+                        Match.tag("Success", result => <>
+                            <Heading>{result.value.title}</Heading>
+                            <Text>{result.value.body}</Text>
+                            {Result.hasRefreshingFlag(result) && <Text>Refreshing...</Text>}
+                        </>),
+                        Match.tag("Failure", result =>
+                            <Text>An error has occured: {result.cause.toString()}</Text>
+                        ),
+                        Match.orElse(() => <></>),
+                    )}
+                </div>
+
+                <Flex direction="row" justify="center" align="center" gap="1">
+                    <Button onClick={() => runPromise(Effect.andThen(idRef, id => mutation.mutate([id])))}>Mutate</Button>
+                </Flex>
+            </Flex>
+        </Container>
+    )
+})
+
+export const Route = createFileRoute("/query")({
+    component: Component.withRuntime(ResultView, runtime.context)
+})

packages/example/src/routes/result.tsx

@@ -0,0 +1,60 @@
+import { HttpClient, type HttpClientError } from "@effect/platform"
+import { Container, Heading, Text } from "@radix-ui/themes"
+import { createFileRoute } from "@tanstack/react-router"
+import { Cause, Chunk, Console, Effect, flow, Match, Option, Schema, Stream } from "effect"
+import { Component, ErrorObserver, Result, Subscribable } from "effect-fc"
+import { runtime } from "@/runtime"
+
+
+const Post = Schema.Struct({
+    userId: Schema.Int,
+    id: Schema.Int,
+    title: Schema.String,
+    body: Schema.String,
+})
+
+const ResultView = Component.makeUntraced("Result")(function*() {
+    const [resultSubscribable] = yield* Component.useOnMount(() => HttpClient.HttpClient.pipe(
+        Effect.andThen(client => client.get("https://jsonplaceholder.typicode.com/posts/1")),
+        Effect.andThen(response => response.json),
+        Effect.andThen(Schema.decodeUnknown(Post)),
+        Effect.tap(Effect.sleep("250 millis")),
+        Result.forkEffect,
+    ))
+    const [result] = yield* Subscribable.useSubscribables([resultSubscribable])
+
+    yield* Component.useOnMount(() => ErrorObserver.ErrorObserver<HttpClientError.HttpClientError>().pipe(
+        Effect.andThen(observer => observer.subscribe),
+        Effect.andThen(Stream.fromQueue),
+        Stream.unwrapScoped,
+        Stream.runForEach(flow(
+            Cause.failures,
+            Chunk.findFirst(e => e._tag === "RequestError" || e._tag === "ResponseError"),
+            Option.match({
+                onSome: e => Console.log("ResultView HttpClient error", e),
+                onNone: () => Effect.void,
+            }),
+        )),
+        Effect.forkScoped,
+    ))
+
+    return (
+        <Container>
+            {Match.value(result).pipe(
+                Match.tag("Running", () => <Text>Loading...</Text>),
+                Match.tag("Success", result => <>
+                    <Heading>{result.value.title}</Heading>
+                    <Text>{result.value.body}</Text>
+                </>),
+                Match.tag("Failure", result =>
+                    <Text>An error has occured: {result.cause.toString()}</Text>
+                ),
+                Match.orElse(() => <></>),
+            )}
+        </Container>
+    )
+})
+
+export const Route = createFileRoute("/result")({
+    component: Component.withRuntime(ResultView, runtime.context)
+})

packages/example/src/runtime.ts

@@ -1,14 +1,15 @@
 import { FetchHttpClient } from "@effect/platform"
 import { Clipboard, Geolocation, Permissions } from "@effect/platform-browser"
-import { Layer } from "effect"
-import { ReactManagedRuntime } from "effect-fc"
+import { DateTime, Layer } from "effect"
+import { ReactRuntime } from "effect-fc"
 
 
 export const AppLive = Layer.empty.pipe(
+    Layer.provideMerge(DateTime.layerCurrentZoneLocal),
     Layer.provideMerge(Clipboard.layer),
     Layer.provideMerge(Geolocation.layer),
     Layer.provideMerge(Permissions.layer),
     Layer.provideMerge(FetchHttpClient.layer),
 )
 
-export const runtime = ReactManagedRuntime.make(AppLive)
+export const runtime = ReactRuntime.make(AppLive)

packages/example/src/todo/Todo.tsx

@@ -1,15 +1,20 @@
-import * as Domain from "@/domain"
-import { Box, Button, Flex, IconButton, TextArea } from "@radix-ui/themes"
+import { Box, Button, Flex, IconButton } from "@radix-ui/themes"
 import { GetRandomValues, makeUuid4 } from "@typed/id"
-import { Chunk, Effect, Match, Option, Ref, Runtime, SubscriptionRef } from "effect"
-import { Component, Hook } from "effect-fc"
-import { SubscriptionSubRef } from "effect-fc/types"
-import * as React from "react"
+import { Chunk, type DateTime, Effect, Match, Option, Ref, Schema, Stream } from "effect"
+import { Component, Form, Subscribable } from "effect-fc"
 import { FaArrowDown, FaArrowUp } from "react-icons/fa"
 import { FaDeleteLeft } from "react-icons/fa6"
+import * as Domain from "@/domain"
+import { TextFieldFormInput } from "@/lib/form/TextFieldFormInput"
+import { DateTimeUtcFromZonedInput } from "@/lib/schema"
 import { TodosState } from "./TodosState.service"
 
 
+const TodoFormSchema = Schema.compose(Schema.Struct({
+    ...Domain.Todo.Todo.fields,
+    completedAt: Schema.OptionFromSelf(DateTimeUtcFromZonedInput),
+}), Domain.Todo.Todo)
+
 const makeTodo = makeUuid4.pipe(
     Effect.map(id => Domain.Todo.Todo.make({
         id,
@@ -21,76 +26,110 @@ const makeTodo = makeUuid4.pipe(
 
 
 export type TodoProps = (
-    | {
-        readonly _tag: "new"
-        readonly index?: never
-    }
-    | {
-        readonly _tag: "edit"
-        readonly index: number
-    }
+    | { readonly _tag: "new" }
+    | { readonly _tag: "edit", readonly id: string }
 )
 
-export const Todo = Component.make(function* Todo(props: TodoProps) {
-    const runtime = yield* Effect.runtime()
+export class Todo extends Component.makeUntraced("Todo")(function*(props: TodoProps) {
     const state = yield* TodosState
 
-    const ref = yield* Hook.useMemo(() => Match.value(props).pipe(
-        Match.tag("new", () => Effect.andThen(makeTodo, SubscriptionRef.make)),
-        Match.tag("edit", ({ index }) => Effect.succeed(SubscriptionSubRef.makeFromChunkRef(state.ref, index))),
+    const [
+        indexRef,
+        form,
+        contentField,
+        completedAtField,
+    ] = yield* Component.useOnChange(() => Effect.gen(function*() {
+        const indexRef = Match.value(props).pipe(
+            Match.tag("new", () => Subscribable.make({ get: Effect.succeed(-1), changes: Stream.make(-1) })),
+            Match.tag("edit", ({ id }) => state.getIndexSubscribable(id)),
             Match.exhaustive,
-    ), [props._tag, props.index])
+        )
+
+        const form = yield* Form.service({
+            schema: TodoFormSchema,
+            initialEncodedValue: yield* Schema.encode(TodoFormSchema)(
+                yield* Match.value(props).pipe(
+                    Match.tag("new", () => makeTodo),
+                    Match.tag("edit", ({ id }) => state.getElementRef(id)),
+                    Match.exhaustive,
+                )
+            ),
+            f: ([todo, form]) => Match.value(props).pipe(
+                Match.tag("new", () => Ref.update(state.ref, Chunk.prepend(todo)).pipe(
+                    Effect.andThen(makeTodo),
+                    Effect.andThen(Schema.encode(TodoFormSchema)),
+                    Effect.andThen(v => Ref.set(form.encodedValue, v)),
+                )),
+                Match.tag("edit", ({ id }) => Ref.set(state.getElementRef(id), todo)),
+                Match.exhaustive,
+            ),
+            autosubmit: props._tag === "edit",
+            debounce: "250 millis",
+        })
+
+        return [
+            indexRef,
+            form,
+            yield* form.field(["content"]),
+            yield* form.field(["completedAt"]),
+        ] as const
+    }), [props._tag, props._tag === "edit" ? props.id : undefined])
+
+    const [index, size, canSubmit] = yield* Subscribable.useSubscribables([
+        indexRef,
+        state.sizeSubscribable,
+        form.canSubmit,
+    ])
+
+    const runSync = yield* Component.useRunSync()
+    const runPromise = yield* Component.useRunPromise<DateTime.CurrentTimeZone>()
+    const TextFieldFormInputFC = yield* TextFieldFormInput
 
-    const contentRef = React.useMemo(() => SubscriptionSubRef.makeFromPath(ref, ["content"]), [ref])
-    const [todo] = yield* Hook.useSubscribeRefs(ref)
 
     return (
-        <Flex direction="column" align="stretch" gap="2">
         <Flex direction="row" align="center" gap="2">
             <Box flexGrow="1">
-                    <TextArea
-                        value={todo.content}
-                        onChange={e => Runtime.runSync(runtime)(Ref.set(contentRef, e.target.value))}
+                <Flex direction="column" align="stretch" gap="2">
+                    <TextFieldFormInputFC field={contentField} />
+
+                    <Flex direction="row" justify="center" align="center" gap="2">
+                        <TextFieldFormInputFC
+                            optional
+                            field={completedAtField}
+                            type="datetime-local"
+                            defaultValue=""
                         />
+
+                        {props._tag === "new" &&
+                            <Button disabled={!canSubmit} onClick={() => void runPromise(form.submit)}>
+                                Add
+                            </Button>
+                        }
+                    </Flex>
+                </Flex>
             </Box>
 
             {props._tag === "edit" &&
                 <Flex direction="column" justify="center" align="center" gap="1">
                     <IconButton
+                        disabled={index <= 0}
+                        onClick={() => runSync(state.moveLeft(props.id))}
                     >
                         <FaArrowUp />
                     </IconButton>
 
                     <IconButton
+                        disabled={index >= size - 1}
+                        onClick={() => runSync(state.moveRight(props.id))}
                     >
                         <FaArrowDown />
                     </IconButton>
 
-                        <IconButton
-                            onClick={() => Runtime.runSync(runtime)(
-                                Ref.update(state.ref, Chunk.remove(props.index))
-                            )}
-                        >
+                    <IconButton onClick={() => runSync(state.remove(props.id))}>
                         <FaDeleteLeft />
                     </IconButton>
                 </Flex>
             }
         </Flex>
-
-            {props._tag === "new" &&
-                <Flex direction="row" justify="center">
-                    <Button
-                        onClick={() => ref.pipe(
-                            Effect.andThen(todo => Ref.update(state.ref, Chunk.prepend(todo))),
-                            Effect.andThen(makeTodo),
-                            Effect.andThen(todo => Ref.set(ref, todo)),
-                            Runtime.runSync(runtime),
-                        )}
-                    >
-                        Add
-                    </Button>
-                </Flex>
-            }
-        </Flex>
     )
-})
+}) {}

packages/example/src/todo/Todos.tsx

@@ -1,27 +1,32 @@
 import { Container, Flex, Heading } from "@radix-ui/themes"
-import { Chunk } from "effect"
-import { Component, Hook } from "effect-fc"
+import { Chunk, Console, Effect } from "effect"
+import { Component, Subscribable } from "effect-fc"
 import { Todo } from "./Todo"
 import { TodosState } from "./TodosState.service"
 
 
-export const Todos = Component.make(function* Todos() {
+export class Todos extends Component.makeUntraced("Todos")(function*() {
     const state = yield* TodosState
-    const [todos] = yield* Hook.useSubscribeRefs(state.ref)
+    const [todos] = yield* Subscribable.useSubscribables([state.ref])
 
-    const VTodo = yield* Component.useFC(Todo)
+    yield* Component.useOnMount(() => Effect.andThen(
+        Console.log("Todos mounted"),
+        Effect.addFinalizer(() => Console.log("Todos unmounted")),
+    ))
+
+    const TodoFC = yield* Todo
 
     return (
         <Container>
             <Heading align="center">Todos</Heading>
 
             <Flex direction="column" align="stretch" gap="2" mt="2">
-                <VTodo _tag="new" />
+                <TodoFC _tag="new" />
 
-                {Chunk.map(todos, (v, k) =>
-                    <VTodo key={v.id} _tag="edit" index={k} />
+                {Chunk.map(todos, todo =>
+                    <TodoFC key={todo.id} _tag="edit" id={todo.id} />
                 )}
             </Flex>
         </Container>
     )
-})
+}) {}

packages/example/src/todo/TodosState.service.ts

@@ -1,11 +1,12 @@
-import { Todo } from "@/domain"
 import { KeyValueStore } from "@effect/platform"
 import { BrowserKeyValueStore } from "@effect/platform-browser"
 import { Chunk, Console, Effect, Option, Schema, Stream, SubscriptionRef } from "effect"
+import { Subscribable, SubscriptionSubRef } from "effect-fc"
+import { Todo } from "@/domain"
 
 
 export class TodosState extends Effect.Service<TodosState>()("TodosState", {
-    effect: Effect.fn("TodosState")(function*(key: string) {
+    scoped: Effect.fnUntraced(function*(key: string) {
         const kv = yield* KeyValueStore.KeyValueStore
 
         const readFromLocalStorage = Console.log("Reading todos from local storage...").pipe(
@@ -17,7 +18,6 @@ export class TodosState extends Effect.Service<TodosState>()("TodosState", {
                 onNone: () => Effect.succeed(Chunk.empty()),
             }))
         )
-
         const saveToLocalStorage = (todos: Chunk.Chunk<Todo.Todo>) => Effect.andThen(
             Console.log("Saving todos to local storage..."),
             Chunk.isNonEmpty(todos)
@@ -31,7 +31,6 @@ export class TodosState extends Effect.Service<TodosState>()("TodosState", {
         )
 
         const ref = yield* SubscriptionRef.make(yield* readFromLocalStorage)
-
         yield* Effect.forkScoped(ref.changes.pipe(
             Stream.debounce("500 millis"),
             Stream.runForEach(saveToLocalStorage),
@@ -41,7 +40,54 @@ export class TodosState extends Effect.Service<TodosState>()("TodosState", {
             Effect.ignore,
         ))
 
-        return { ref } as const
+        const sizeSubscribable = Subscribable.make({
+            get: Effect.andThen(ref, Chunk.size),
+            get changes() { return Stream.map(ref.changes, Chunk.size) },
+        })
+        const getElementRef = (id: string) => SubscriptionSubRef.makeFromChunkFindFirst(ref, v => v.id === id)
+        const getIndexSubscribable = (id: string) => Subscribable.make({
+            get: Effect.flatMap(ref, Chunk.findFirstIndex(v => v.id === id)),
+            get changes() { return Stream.flatMap(ref.changes, Chunk.findFirstIndex(v => v.id === id)) },
+        })
+
+        const moveLeft = (id: string) => SubscriptionRef.updateEffect(ref, todos => Effect.Do.pipe(
+            Effect.bind("index", () => Chunk.findFirstIndex(todos, v => v.id === id)),
+            Effect.bind("todo", ({ index }) => Chunk.get(todos, index)),
+            Effect.bind("previous", ({ index }) => Chunk.get(todos, index - 1)),
+            Effect.andThen(({ todo, index, previous }) => index > 0
+                ? todos.pipe(
+                    Chunk.replace(index, previous),
+                    Chunk.replace(index - 1, todo),
+                )
+                : todos
+            ),
+        ))
+        const moveRight = (id: string) => SubscriptionRef.updateEffect(ref, todos => Effect.Do.pipe(
+            Effect.bind("index", () => Chunk.findFirstIndex(todos, v => v.id === id)),
+            Effect.bind("todo", ({ index }) => Chunk.get(todos, index)),
+            Effect.bind("next", ({ index }) => Chunk.get(todos, index + 1)),
+            Effect.andThen(({ todo, index, next }) => index < Chunk.size(todos) - 1
+                ? todos.pipe(
+                    Chunk.replace(index, next),
+                    Chunk.replace(index + 1, todo),
+                )
+                : todos
+            ),
+        ))
+        const remove = (id: string) => SubscriptionRef.updateEffect(ref, todos => Effect.andThen(
+            Chunk.findFirstIndex(todos, v => v.id === id),
+            index => Chunk.remove(todos, index),
+        ))
+
+        return {
+            ref,
+            sizeSubscribable,
+            getElementRef,
+            getIndexSubscribable,
+            moveLeft,
+            moveRight,
+            remove,
+        } as const
     }),
 
     dependencies: [BrowserKeyValueStore.layerLocalStorage],

packages/example/tsconfig.app.json

@@ -22,15 +22,15 @@
     "noFallthroughCasesInSwitch": true,
     "noUncheckedSideEffectImports": true,
 
+    "baseUrl": ".",
     "paths": {
       "@/*": ["./src/*"]
     },
 
     "plugins": [
-      {
-        "name": "@effect/language-service"
-      }
+      { "name": "@effect/language-service" }
     ]
   },
+
   "include": ["src"]
 }

packages/example/tsconfig.node.json

@@ -20,5 +20,6 @@
     "noFallthroughCasesInSwitch": true,
     "noUncheckedSideEffectImports": true
   },
+
   "include": ["vite.config.ts"]
 }

packages/example/vite.config.ts

@@ -1,4 +1,4 @@
-import { TanStackRouterVite } from "@tanstack/router-plugin/vite"
+import { tanstackRouter } from "@tanstack/router-plugin/vite"
 import react from "@vitejs/plugin-react"
 import path from "node:path"
 import { defineConfig } from "vite"
@@ -7,7 +7,10 @@ import { defineConfig } from "vite"
 // https://vite.dev/config/
 export default defineConfig({
     plugins: [
-        TanStackRouterVite(),
+        tanstackRouter({
+            target: "react",
+            autoCodeSplitting: true,
+        }),
         react(),
     ],
 

renovate.json

@@ -0,0 +1,19 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": ["config:recommended"],
+  "baseBranchPatterns": ["next"],
+  "packageRules": [
+    {
+      "matchManagers": ["bun", "npm"],
+      "matchUpdateTypes": ["minor", "patch"],
+      "groupName": "bun minor+patch updates",
+      "groupSlug": "bun-minor-patch"
+    },
+    {
+      "matchManagers": ["dockerfile", "docker-compose"],
+      "matchUpdateTypes": ["minor", "patch", "digest"],
+      "groupName": "docker minor+patch+digest updates",
+      "groupSlug": "docker-minor-patch-digest"
+    }
+  ]
+}

turbo.json

@@ -1,11 +1,30 @@
 {
   "$schema": "https://turbo.build/schema.json",
+
   "tasks": {
+    "lint:tsc": {
+      "cache": false
+    },
+    "lint:biome": {
+      "cache": false
+    },
     "build": {
       "dependsOn": ["^build"],
       "inputs": ["./src/**"],
       "outputs": ["./dist/**"]
     },
-    "pack": {}
+    "pack": {
+      "dependsOn": ["^pack"],
+      "cache": false
+    },
+    "clean:cache": {
+      "cache": false
+    },
+    "clean:dist": {
+      "cache": false
+    },
+    "clean:modules": {
+      "cache": false
+    }
   }
 }