Hooks

packages/effect-components/package.json

@@ -16,6 +16,10 @@
       "types": "./dist/index.d.ts",
       "default": "./dist/index.js"
     },
+    "./types": {
+      "types": "./dist/types/index.d.ts",
+      "default": "./dist/types/index.js"
+    },
     "./*": {
       "types": "./dist/*.d.ts",
       "default": "./dist/*.js"

packages/effect-components/src/ReactComponent.ts

@@ -1,89 +1,72 @@
-import { Context, Effect, ExecutionStrategy, Exit, Ref, Runtime, Scope, Tracer } from "effect"
+import { Context, Effect, Function, Runtime, Scope, Tracer } from "effect"
+import type { Mutable } from "effect/Types"
 import * as React from "react"
 import * as ReactHook from "./ReactHook.js"
 
 
-export interface ReactComponent<P, E, R> {
+export interface ReactComponent<E, R, P> {
     (props: P): Effect.Effect<React.ReactNode, E, R>
+    readonly displayName?: string
 }
 
+export const nonReactiveTags = [Tracer.ParentSpan] as const
+
+export const withDisplayName: {
+    <C extends ReactComponent<any, any, any>>(displayName: string): (self: C) => C
+    <C extends ReactComponent<any, any, any>>(self: C, displayName: string): C
+} = Function.dual(2, <C extends ReactComponent<any, any, any>>(
+    self: C,
+    displayName: string,
+): C => {
+    (self as Mutable<C>).displayName = displayName
+    return self
+})
 
 export const useFC: {
-    <P, E, R>(
-        self: ReactComponent<P, E, R>,
+    <E, R, P extends {} = {}>(
+        self: ReactComponent<E, R, P>,
         options?: ReactHook.ScopeOptions,
     ): Effect.Effect<React.FC<P>, never, Exclude<R, Scope.Scope>>
-} = Effect.fn(function* useFC<P, E, R>(
-    self: ReactComponent<P, E, R>,
+} = Effect.fnUntraced(function* <E, R, P extends {}>(
+    self: ReactComponent<E, R, P>,
     options?: ReactHook.ScopeOptions,
 ) {
     const runtime = yield* Effect.runtime<Exclude<R, Scope.Scope>>()
 
-    return React.useCallback((props: P) => Runtime.runSync(runtime)(
-        self(props) as Effect.Effect<React.ReactNode, E, Exclude<R, Scope.Scope>>
-    ), [])
+    return React.useMemo(() => function ScopeProvider(props: P) {
+        const scope = Runtime.runSync(runtime)(ReactHook.useScope(options))
+
+        const FC = React.useMemo(() => {
+            const f = (props: P) => Runtime.runSync(runtime)(
+                Effect.provideService(self(props), Scope.Scope, scope)
+            )
+            if (self.displayName) f.displayName = self.displayName
+            return f
+        }, [scope])
+
+        return React.createElement(FC, props)
+    }, Array.from(
+        Context.omit(...nonReactiveTags)(runtime.context).unsafeMap.values()
+    ))
 })
 
 export const use: {
-    <P, E, R>(
-        self: ReactComponent<P, E, R>,
+    <E, R, P extends {} = {}>(
+        self: ReactComponent<E, R, P>,
         fn: (Component: React.FC<P>) => React.ReactNode,
         options?: ReactHook.ScopeOptions,
     ): Effect.Effect<React.ReactNode, never, Exclude<R, Scope.Scope>>
-} = Effect.fn(function* use<P, E, R>(
-    self: ReactComponent<P, E, R>,
-    fn: (Component: React.FC<P>) => React.ReactNode,
-    options?: ReactHook.ScopeOptions,
-) {
+} = Effect.fnUntraced(function*(self, fn, options) {
     return fn(yield* useFC(self, options))
 })
 
-
-const FC = <P, E, R>(
-    self: ReactComponent<P, E, R>,
-    runtime: Runtime.Runtime<R>,
-    props: P,
-    options?: ReactHook.ScopeOptions,
-): React.ReactNode => {
-    const [isInitialRun, initialScope] = React.useMemo(() => Runtime.runSync(runtime)(
-        Effect.all([Ref.make(true), makeScope(options)])
-    ), [])
-    const [scope, setScope] = React.useState(initialScope)
-
-    React.useEffect(() => Runtime.runSync(runtime)(
-        Effect.if(isInitialRun, {
-            onTrue: () => Effect.as(
-                Ref.set(isInitialRun, false),
-                () => closeScope(scope, runtime, options),
-            ),
-
-            onFalse: () => makeScope(options).pipe(
-                Effect.tap(scope => Effect.sync(() => setScope(scope))),
-                Effect.map(scope => () => closeScope(scope, runtime, options)),
-            ),
-        })
-    ), [])
-
-    return React.useMemo(() => Runtime.runSync(runtime)(
-        Effect.provideService(self(props), Scope.Scope, scope)
-    ), [
-        props,
-        ...Array.from(Context.omit(Tracer.ParentSpan)(runtime.context).unsafeMap.values()),
-    ])
-}
-
-const makeScope = (options?: ReactHook.ScopeOptions) => Scope.make(options?.finalizerExecutionStrategy ?? ExecutionStrategy.sequential)
-const closeScope = (
-    scope: Scope.CloseableScope,
-    runtime: Runtime.Runtime<never>,
-    options?: ReactHook.ScopeOptions,
-) => {
-    switch (options?.finalizerExecutionMode ?? "sync") {
-        case "sync":
-            Runtime.runSync(runtime)(Scope.close(scope, Exit.void))
-            break
-        case "fork":
-            Runtime.runFork(runtime)(Scope.close(scope, Exit.void))
-            break
-    }
-}
+export const withRuntime: {
+    <E, R, P extends {} = {}>(context: React.Context<Runtime.Runtime<R>>): (self: ReactComponent<E, R, P>) => React.FC<P>
+    <E, R, P extends {} = {}>(self: ReactComponent<E, R, P>, context: React.Context<Runtime.Runtime<R>>): React.FC<P>
+} = Function.dual(2, <E, R, P extends {}>(
+    self: ReactComponent<E, R, 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)
+})

packages/effect-components/src/ReactHook.ts

@@ -1,5 +1,6 @@
-import { Effect, ExecutionStrategy, Runtime, Scope } from "effect"
+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 {
@@ -8,39 +9,121 @@ export interface ScopeOptions {
 }
 
 
+export const useScope: {
+    (options?: ScopeOptions): Effect.Effect<Scope.Scope>
+} = Effect.fnUntraced(function* (options?: ScopeOptions) {
+    const runtime = yield* Effect.runtime()
+
+    const [isInitialRun, initialScope] = React.useMemo(() => Runtime.runSync(runtime)(
+        Effect.all([Ref.make(true), makeScope(options)])
+    ), [])
+    const [scope, setScope] = React.useState(initialScope)
+
+    React.useEffect(() => Runtime.runSync(runtime)(
+        Effect.if(isInitialRun, {
+            onTrue: () => Effect.as(
+                Ref.set(isInitialRun, false),
+                () => closeScope(scope, runtime, options),
+            ),
+
+            onFalse: () => makeScope(options).pipe(
+                Effect.tap(scope => Effect.sync(() => setScope(scope))),
+                Effect.map(scope => () => closeScope(scope, runtime, options)),
+            ),
+        })
+    ), [])
+
+    return scope
+})
+
+const makeScope = (options?: ScopeOptions) => Scope.make(options?.finalizerExecutionStrategy ?? ExecutionStrategy.sequential)
+const closeScope = (
+    scope: Scope.CloseableScope,
+    runtime: Runtime.Runtime<never>,
+    options?: ScopeOptions,
+) => {
+    switch (options?.finalizerExecutionMode ?? "sync") {
+        case "sync":
+            Runtime.runSync(runtime)(Scope.close(scope, Exit.void))
+            break
+        case "fork":
+            Runtime.runFork(runtime)(Scope.close(scope, Exit.void))
+            break
+    }
+}
+
+
 export const useMemo: {
     <A, E, R>(
         factory: () => Effect.Effect<A, E, R>,
         deps: React.DependencyList,
-    ): Effect.Effect<A, never, R>
-} = Effect.fnUntraced(function* useMemo<A, E, R>(
+    ): Effect.Effect<A, E, R>
+} = Effect.fnUntraced(function* <A, E, R>(
     factory: () => Effect.Effect<A, E, R>,
     deps: React.DependencyList,
 ) {
-    const runtime = yield* Effect.runtime<R>()
-    return React.useMemo(() => Runtime.runSync(runtime)(factory()), deps)
+    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, never, R>
-} = Effect.fnUntraced(function* useOnce<A, E, R>(
+    <A, E, R>(factory: () => Effect.Effect<A, E, R>): Effect.Effect<A, E, R>
+} = Effect.fnUntraced(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.fnUntraced(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.fnUntraced(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.fnUntraced(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 | Scope.Scope>,
+        effect: () => Effect.Effect<void, E, R>,
         deps?: React.DependencyList,
         options?: ScopeOptions,
-    ): Effect.Effect<void, never, R>
-} = Effect.fnUntraced(function* useEffect<E, R>(
-    effect: () => Effect.Effect<void, E, R | Scope.Scope>,
+    ): Effect.Effect<void, never, Exclude<R, Scope.Scope>>
+} = Effect.fnUntraced(function* <E, R>(
+    effect: () => Effect.Effect<void, E, R>,
     deps?: React.DependencyList,
     options?: ScopeOptions,
 ) {
-    const runtime = yield* Effect.runtime<R>()
+    const runtime = yield* Effect.runtime<Exclude<R, Scope.Scope>>()
 
     React.useEffect(() => {
         const { scope, exit } = Effect.Do.pipe(
@@ -64,16 +147,16 @@ export const useEffect: {
 
 export const useLayoutEffect: {
     <E, R>(
-        effect: () => Effect.Effect<void, E, R | Scope.Scope>,
+        effect: () => Effect.Effect<void, E, R>,
         deps?: React.DependencyList,
         options?: ScopeOptions,
-    ): Effect.Effect<void, never, R>
-} = Effect.fnUntraced(function* useLayoutEffect<E, R>(
-    effect: () => Effect.Effect<void, E, R | Scope.Scope>,
+    ): Effect.Effect<void, never, Exclude<R, Scope.Scope>>
+} = Effect.fnUntraced(function* <E, R>(
+    effect: () => Effect.Effect<void, E, R>,
     deps?: React.DependencyList,
     options?: ScopeOptions,
 ) {
-    const runtime = yield* Effect.runtime<R>()
+    const runtime = yield* Effect.runtime<Exclude<R, Scope.Scope>>()
 
     React.useLayoutEffect(() => {
         const { scope, exit } = Effect.Do.pipe(
@@ -94,3 +177,141 @@ export const useLayoutEffect: {
         }
     }, 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.fnUntraced(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.fnUntraced(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.fnUntraced(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.fnUntraced(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.fnUntraced(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.fnUntraced(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-components/src/ReactManagedRuntime.ts

@@ -0,0 +1,47 @@
+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 AsyncProviderProps<R, ER> extends React.SuspenseProps {
+    readonly runtime: ReactManagedRuntime<R, ER>
+    readonly children?: React.ReactNode
+}
+
+export function AsyncProvider<R, ER>(
+    { runtime, children, ...suspenseProps }: AsyncProviderProps<R, ER>
+): React.ReactNode {
+    const promise = React.useMemo(() => Effect.runPromise(runtime.runtime.runtimeEffect), [runtime])
+
+    return React.createElement(
+        React.Suspense,
+        suspenseProps,
+        React.createElement(AsyncProviderInner<R, ER>, { runtime, promise, children }),
+    )
+}
+
+interface AsyncProviderInnerProps<R, ER> {
+    readonly runtime: ReactManagedRuntime<R, ER>
+    readonly promise: Promise<Runtime.Runtime<R>>
+    readonly children?: React.ReactNode
+}
+
+function AsyncProviderInner<R, ER>(
+    { runtime, promise, children }: AsyncProviderInnerProps<R, ER>
+): React.ReactNode {
+    const value = React.use(promise)
+    return React.createElement(runtime.context, { value }, children)
+}

packages/effect-components/src/index.ts

@@ -1,2 +1,3 @@
 export * as ReactComponent from "./ReactComponent.js"
 export * as ReactHook from "./ReactHook.js"
+export * as ReactManagedRuntime from "./ReactManagedRuntime.js"

packages/effect-components/src/types/PropertyPath.ts

@@ -0,0 +1,99 @@
+import { Array, Function, Option, Predicate } from "effect"
+
+
+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> :
+    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]
+    ? Head extends keyof T
+        ? ValueFromPath<T[Head], Tail>
+        : T extends readonly any[]
+            ? Head extends number
+                ? ValueFromPath<T[number], Tail>
+                : never
+            : never
+    : T
+
+export type AnyKey = string | number | symbol
+export type AnyPath = readonly AnyKey[]
+
+
+export const unsafeGet: {
+    <T, const P extends Paths<T>>(path: P): (self: T) => ValueFromPath<T, P>
+    <T, const P extends Paths<T>>(self: T, path: P): ValueFromPath<T, P>
+} = Function.dual(2, <T, const P extends Paths<T>>(self: T, path: P): ValueFromPath<T, P> =>
+    path.reduce((acc: any, key: any) => acc?.[key], self)
+)
+
+export const get: {
+    <T, const P extends Paths<T>>(path: P): (self: T) => Option.Option<ValueFromPath<T, P>>
+    <T, const P extends Paths<T>>(self: T, path: P): Option.Option<ValueFromPath<T, P>>
+} = Function.dual(2, <T, const P extends Paths<T>>(self: T, path: P): Option.Option<ValueFromPath<T, P>> =>
+    path.reduce(
+        (acc: Option.Option<any>, key: any): Option.Option<any> => Option.isSome(acc)
+            ? Predicate.hasProperty(acc.value, key)
+                ? Option.some(acc.value[key])
+                : Option.none()
+            : acc,
+
+        Option.some(self),
+    )
+)
+
+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>>(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)
+    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)
+    if (Option.isNone(child))
+        return child
+
+    if (Array.isArray(self))
+        return typeof key.value === "number"
+            ? Option.some([
+                ...self.slice(0, key.value),
+                child.value,
+                ...self.slice(key.value + 1),
+            ] as T)
+            : Option.none()
+
+    if (typeof self === "object")
+        return Option.some(
+            Object.assign(
+                Object.create(Object.getPrototypeOf(self)),
+                { ...self, [key.value]: child.value },
+            )
+        )
+
+    return Option.none()
+})

packages/effect-components/src/types/SetStateAction.ts

@@ -0,0 +1,12 @@
+import { Function } from "effect"
+import type * as React from "react"
+
+
+export const value: {
+    <S>(prevState: S): (self: React.SetStateAction<S>) => S
+    <S>(self: React.SetStateAction<S>, prevState: S): S
+} = Function.dual(2, <S>(self: React.SetStateAction<S>, prevState: S): S =>
+    typeof self === "function"
+        ? (self as (prevState: S) => S)(prevState)
+        : self
+)

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

@@ -0,0 +1,100 @@
+import { 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(Ref.get(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>,
+    getter: (parentValue: B) => A,
+    setter: (parentValue: B, value: A) => B,
+): SubscriptionSubRef<A, B> => new SubscriptionSubRefImpl(parent, getter, setter)
+
+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)),
+)

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

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

packages/example/src/routes/effect-component-tests.tsx

@@ -1,8 +1,26 @@
-import { Box, Text, TextField } from "@radix-ui/themes"
+import { Box, TextField } from "@radix-ui/themes"
 import { createFileRoute } from "@tanstack/react-router"
-import { Console, Effect, Layer, ManagedRuntime, SubscriptionRef } from "effect"
-import { ReactComponent, ReactHook } from "effect-components"
-import * as React from "react"
+import { Array, Console, Effect, Layer, pipe, Ref, Runtime, SubscriptionRef } from "effect"
+import { ReactComponent, ReactHook, ReactManagedRuntime } from "effect-components"
+
+
+const LogLive = Layer.scopedDiscard(Effect.acquireRelease(
+    Console.log("Runtime built."),
+    () => Console.log("Runtime destroyed."),
+))
+
+class TestService extends Effect.Service<TestService>()("TestService", {
+    effect: Effect.bind(Effect.Do, "ref", () => SubscriptionRef.make("value")),
+}) {}
+
+class SubService extends Effect.Service<SubService>()("SubService", {
+    effect: Effect.bind(Effect.Do, "ref", () => SubscriptionRef.make("subvalue")),
+}) {}
+
+const runtime = ReactManagedRuntime.make(Layer.empty.pipe(
+    Layer.provideMerge(LogLive),
+    Layer.provideMerge(TestService.Default),
+))
 
 
 export const Route = createFileRoute("/effect-component-tests")({
@@ -10,39 +28,78 @@ export const Route = createFileRoute("/effect-component-tests")({
 })
 
 function RouteComponent() {
-    const runtime = React.useMemo(() => ManagedRuntime.make(Layer.empty), [])
-
-    return <>
-        {runtime.runSync(ReactComponent.use(MyTestComponent, Component => (
-            <Component />
-        )).pipe(
-            Effect.scoped
-        ))}
-    </>
+    return (
+        <ReactManagedRuntime.AsyncProvider runtime={runtime}>
+            <MyRoute />
+        </ReactManagedRuntime.AsyncProvider>
+    )
 }
 
+const MyRoute = pipe(
+    Effect.fn(function*() {
+        const runtime = yield* Effect.runtime()
 
-class TestService extends Effect.Service<TestService>()("TestService", {
-    effect: Effect.bind(Effect.Do, "ref", () => SubscriptionRef.make("value")),
-}) {}
+        const service = yield* TestService
+        const [value] = yield* ReactHook.useSubscribeRefs(service.ref)
 
-const MyTestComponent = Effect.fn(function* MyTestComponent(props?: { readonly value?: string }) {
-    const [state, setState] = React.useState("value")
-    const effectValue = yield* Effect.succeed(`state: ${ state }`)
-
-    yield* ReactHook.useOnce(() => Effect.andThen(
-        Effect.addFinalizer(() => Console.log("MyTestComponent umounted")),
-        Console.log("MyTestComponent mounted"),
-    ))
+        // const MyTestComponentFC = yield* Effect.provide(
+        //     ReactComponent.useFC(MyTestComponent),
+        //     yield* ReactHook.useMemoLayer(SubService.Default),
+        // )
 
         return <>
-        <Text>{effectValue}</Text>
-
             <Box>
                 <TextField.Root
-                value={state}
-                onChange={e => setState(e.target.value)}
+                    value={value}
+                    onChange={e => Runtime.runSync(runtime)(Ref.set(service.ref, e.target.value))}
+                />
+            </Box>
+
+            {/* {yield* ReactComponent.use(MyTestComponent, C => <C />).pipe(
+                Effect.provide(yield* ReactHook.useMemoLayer(SubService.Default))
+            )} */}
+
+            {/* {Array.range(0, 3).map(k =>
+                <MyTestComponentFC key={k} />
+            )} */}
+
+            {yield* pipe(
+                Array.range(0, 3),
+                Array.map(k => ReactComponent.use(MyTestComponent, FC =>
+                    <FC key={k} />
+                )),
+                Effect.all,
+                Effect.provide(yield* ReactHook.useMemoLayer(SubService.Default)),
+            )}
+        </>
+    }),
+
+    ReactComponent.withDisplayName("MyRoute"),
+    ReactComponent.withRuntime(runtime.context),
+)
+
+
+const MyTestComponent = pipe(
+    Effect.fn(function*() {
+        const runtime = yield* Effect.runtime()
+
+        const service = yield* SubService
+        const [value] = yield* ReactHook.useSubscribeRefs(service.ref)
+
+        // yield* ReactHook.useMemo(() => Effect.andThen(
+        //     Effect.addFinalizer(() => Console.log("MyTestComponent umounted")),
+        //     Console.log("MyTestComponent mounted"),
+        // ), [])
+
+        return <>
+            <Box>
+                <TextField.Root
+                    value={value}
+                    onChange={e => Runtime.runSync(runtime)(Ref.set(service.ref, e.target.value))}
                 />
             </Box>
         </>
-})
+    }),
+
+    ReactComponent.withDisplayName("MyTestComponent"),
+)