packages/effect-view/AGENTS.md

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+# effect-view
+
+`effect-view` lets a React function component be described as an Effect program: yield services, create scoped resources, subscribe to reactive state, and turn Effects into React callbacks inside a component body, then convert that description into a normal React function component at a React boundary.
+
+Requires Effect v4 (RC) and React 19.2+. Peer dependencies: `effect`, `react`, `@types/react`. Not tied to `react-dom` — any React renderer works.
+
+When writing effect-view code, use the actual current source and tests in `src/` as ground truth over anything remembered from training — the API is pre-1.0 and still moving. The files below are a concise reference; read the linked one(s) before writing code that touches that concern.
+
+## Core model
+
+1. `ReactRuntime` builds the Effect services available to the UI and exposes them through React context.
+2. `Component.make` defines a component body as an Effect generator.
+3. `Component.withContext` converts a `Component` into a normal React component at a React boundary (app root, router, third-party library). Apply it only there — never between two effect-view components.
+4. Inside another effect-view component, compose children by yielding their `.use` Effect.
+5. Every rendered component instance owns a root `Scope.Scope`, opened on mount and closed on unmount; regular component setup must complete **synchronously** during render unless the component is wrapped with `Async.async`.
+
+## Find the right doc by what you're trying to do
+
+**Setting up the app** — building the runtime, providing it to the tree → [ReactRuntime.md](./ai-docs/ReactRuntime.md)
+
+**Defining a component, its lifecycle, or running Effects from event handlers** → [Component.md](./ai-docs/Component.md)
+
+**Storing, reading, or subscribing to state** (local, shared via a service, or focused into a nested field) → [State.md](./ai-docs/State.md) — `Lens` (read/write) and `View` (read-only)
+
+**Rendering something that needs to wait on an async Effect, or avoiding unnecessary re-renders/re-fetches** → [Async.md](./ai-docs/Async.md) — `Async` (suspend on an Effect) and `Memoized` (`React.memo` wrapper)
+
+**Fetching/caching server data** (reactive keys, staleness, background refresh, invalidation) → [Query.md](./ai-docs/Query.md) — includes `QueryClient`, the cache service `Query` runs against
+
+**Triggering a write** (save, delete, upload, send) with pending/error state → [Mutation.md](./ai-docs/Mutation.md)
+
+**Building a schema-driven form**:
+- shared concepts (encoded vs decoded value, focusing into fields, input/status hooks) → [Form.md](./ai-docs/Form.md) — read this first
+- a form that submits a valid value via a `Mutation` → [MutationForm.md](./ai-docs/MutationForm.md)
+- a form that keeps a target `Lens` continuously synchronized with a valid draft → [LensForm.md](./ai-docs/LensForm.md)
+
+**Small utilities**:
+- bridging React-tracked values into an Effect `PubSub` → [PubSub.md](./ai-docs/PubSub.md)
+- consuming a raw Effect `Stream` as React state → [Stream.md](./ai-docs/Stream.md)
+
+## Choosing between async integrations
+
+- One-off async read before rendering → `Async.async`.
+- Cached/shared/refreshable server reads → `Query`.
+- User-triggered writes with observable pending/error state → `Mutation`.
+- Async work in an event handler with no need for `Mutation` state → `Component.useRunPromise`/`useCallbackPromise`.
+- Subscriptions or background work tied to component lifecycle → a scoped fiber forked from `Component.useReactEffect`.
+
+## Common pitfalls
+
+- Never yield an asynchronous Effect directly from a regular (non-`Async`) component body.
+- effect-view hooks are still React hooks under the hood: call them unconditionally, at the top level, in a stable order — never in branches, loops, or after a suspend point.
+- Keep `ReactRuntime` instances and `Layer` references stable; building them during render creates new resources and a new React context every time.
+- `Component.withContext` requires a matching `ReactRuntime.Provider` above it in the tree.

packages/effect-view/ai-docs/Async.md

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+# Async and Memoized
+
+Two `Component` traits that control render behavior: `Async` lets a component's body suspend on an asynchronous Effect; `Memoized` skips re-rendering a component when its props haven't changed. They're commonly combined, since an unmemoized `Async` component restarts its async computation on every unrelated parent render.
+
+## Async
+
+Components run synchronously by default (the body must complete without suspending during render). `Async.async` lifts a component so its body may await an asynchronous Effect before returning JSX; React Suspense handles the wait.
+
+```tsx
+import { Effect } from "effect"
+import { Async, Component } from "effect-view"
+
+export const UserCard = Component.make("UserCard")(function* ({ userId }: { readonly userId: string }) {
+  const user = yield* Component.useOnChange(() => loadUser(userId), [userId])
+  return <article>{user.name}</article>
+}).pipe(Async.async)
+```
+
+Render with a fallback (per-use or as a component default):
+
+```tsx
+const User = yield* UserCard.use
+<User userId="123" fallback={<p>Loading user...</p>} />
+```
+
+```tsx
+.pipe(Async.async, Async.withOptions({ defaultFallback: <p>Loading user...</p> }))
+```
+
+Rules:
+
+- **Hook ordering**: place every React hook and effect-view hook helper *before* the first operation that may suspend. After a suspend point, the generator continuation runs outside React's synchronous render phase, so no hooks may follow it.
+- The `promise` prop name is reserved on async components (used internally) — do not declare a prop with that name.
+
+When to reach for `Async` vs alternatives:
+
+- One-off asynchronous read before rendering → `Async.async`.
+- Cached/shared/refreshable server reads → `Query` (see `Query.md`).
+- User-triggered writes with pending/error state → `Mutation` (see `Mutation.md`).
+- Async work in an event handler with no need for `Mutation` state → `useRunPromise`/`useCallbackPromise` (see `Component.md`).
+- Subscriptions or background work tied to lifecycle → a scoped fiber forked from `useReactEffect`.
+
+## Memoized
+
+Wraps a component's rendered function with `React.memo`, so an unrelated parent re-render doesn't re-run the component (or restart an `Async` child's in-flight computation) when props are unchanged.
+
+```tsx
+import { Async, Component, Memoized } from "effect-view"
+
+export const UserCard = Component.make("UserCard")(function* ({ userId }: { readonly userId: string }) {
+  const user = yield* Component.useOnChange(() => loadUser(userId), [userId])
+  return <article>{user.name}</article>
+}).pipe(Async.async, Memoized.memoized)
+```
+
+- Default comparison is `Object.is` per prop (React.memo default), except on `Async` components where `fallback` is excluded from the comparison by default.
+- Override with `Memoized.withOptions({ propsEquivalence })`, e.g. `Equal.asEquivalence()` for full structural equality on immutable data. Supplying `propsEquivalence` replaces the default entirely (so `fallback` is included again for `Async` components unless you exclude it yourself).
+- `Memoized` is not exclusive to `Async` — it applies to any `Component` — but it matters most there, since an unmemoized async child otherwise closes/reopens its dependency scope and re-runs its async setup on every parent render.

packages/effect-view/ai-docs/Component.md

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+# Component
+
+Defines a React function component as an Effect program. A `Component` is a description, not yet a React component — cross into React with `Component.withContext` or `.use`.
+
+## Define
+
+```tsx
+import { Effect } from "effect"
+import { Component } from "effect-view"
+
+export const HelloView = Component.make("HelloView")(function* (props: { readonly name: string }) {
+  const message = yield* Effect.succeed(`Hello, ${props.name}`)
+  return <h1>{message}</h1>
+})
+```
+
+- `Component.make(spanName?)(generatorBody, ...pipeArgs)` — same overloads as `Effect.fn`/`Effect.gen`: a generator body, or a body plus `(_, props) => next` pipeline steps. Passing a `spanName` wraps the body in a tracing span and sets `displayName`.
+- `Component.makeUntraced` is identical but skips the automatic span (still sets `displayName` from the name argument).
+- The component's props type, return type, error channel, and required services (`R`) are all inferred from the generator body.
+
+## Cross into React
+
+```tsx
+export const Hello = HelloView.pipe(Component.withContext(runtime.context))
+// <Hello name="Effect" />
+```
+
+`Component.withContext(context)` reads the Effect context supplied by the matching `ReactRuntime.Provider` and turns the component into a plain `React.FC`. Apply it only at boundaries where plain React (a router, a third-party lib, an app root) needs a function component — never between two effect-view components.
+
+## Compose inside effect-view
+
+```tsx
+const Hello = yield* HelloView.use
+return <Hello name="Effect" />
+```
+
+`component.use` is an `Effect<F, never, Exclude<R, Scope.Scope>>` that binds the child to the current Effect context/scope and returns a stable function-component reference. Yield it from a parent component body; do not call `withContext` here.
+
+## Lifecycle hooks
+
+Hooks are plain React hooks under the hood: call them unconditionally, at the top level, in the same order every render — never in branches, loops, callbacks, or after a suspend point.
+
+Every rendered component instance gets a root `Scope.Scope`, created on mount and closed on unmount, provided to the whole body. `Effect.addFinalizer`, `Effect.acquireRelease`, `Effect.forkScoped` used directly in the body run against this scope.
+
+| Hook | Purpose | Scope | Closes |
+|---|---|---|---|
+| body | produce rendered output | component root scope | unmount |
+| `useOnMount(() => effect)` | compute + cache once | component root scope | unmount |
+| `useOnChange(() => effect, deps)` | recompute on deps change | new scope per dep set | deps change / unmount |
+| `useReactEffect(() => effect, deps?)` | post-commit side effect (`Effect.useEffect` analog) | new scope | deps change / unmount |
+| `useReactLayoutEffect(() => effect, deps?)` | pre-paint side effect | new scope | deps change / unmount |
+| `useLayer(layer, options?)` | build + provide a `Layer`, returns its `Context` | new scope tied to layer identity | layer ref changes / unmount |
+
+```tsx
+const state = yield* Component.useOnMount(() =>
+  Effect.gen(function* () {
+    yield* Effect.addFinalizer(() => Effect.log("disposed"))
+    return Lens.fromSubscriptionRef(yield* SubscriptionRef.make(0))
+  }),
+)
+```
+
+- Setup passed to `useOnMount`/`useOnChange`/`useLayer` must complete **synchronously** in a regular component (it runs during render). Wrap the component with `Async.async` to allow suspending setup.
+- `useReactEffect`/`useReactLayoutEffect` setup must also start synchronously but may `Effect.forkScoped` async work into the hook's own scope.
+- `useRunSync`/`useRunPromise`/`useCallbackSync`/`useCallbackPromise` do not create a new scope; they capture the component root scope (and any extra services you request) by default.
+
+## Run Effects from event handlers
+
+```tsx
+const runPromise = yield* Component.useRunPromise() // or useRunPromise<Scope.Scope | SomeService>()
+<button onClick={() => void runPromise(saveUser(user))}>Save</button>
+```
+
+- `useRunSync<R>()` — only for Effects guaranteed to complete synchronously.
+- `useRunPromise<R>()` — for Effects that may suspend/sleep/fetch.
+- `useCallbackSync(f, deps)` / `useCallbackPromise(f, deps)` — memoized variants (same deps semantics as `React.useCallback`) for passing stable callbacks to children.
+- Both runners provide `Scope.Scope` automatically; add extra services with an explicit type argument (`useRunPromise<Scope.Scope | UserRepository>()`).
+
+## Provide services
+
+Static layer, one instance per mounted component, disposed on unmount:
+
+```tsx
+const GreetingViewLive = GreetingView.pipe(Component.provide(GreetingService.layer))
+```
+
+Layer built from render-time state (props/context), provided to children explicitly:
+
+```tsx
+const layer = React.useMemo(() => Layer.succeed(GreetingService, {...}), [props.greeting])
+const context = yield* Component.useLayer(layer)
+const Greeting = yield* Effect.provide(GreetingView.use, context)
+return <Greeting name="Effect" />
+```
+
+Keep layer references stable (module scope or `React.useMemo`) — a new layer object triggers rebuild and finalizer cleanup. Async layer construction requires `Async.async` on the owning component.
+
+## Common pitfalls
+
+- Never yield an asynchronous Effect from a regular component body — use `Async.async`, `Query`, a `Mutation` callback, or a scoped fiber forked from a post-commit hook instead.
+- `Component.withContext` needs a matching `ReactRuntime.Provider` above it in the tree.
+- Prefer `useRunPromise` over `useRunSync` for event handlers that may be async.
+- Regular React hooks, refs, context, and state work normally inside a component body alongside `yield*`.

packages/effect-view/ai-docs/Form.md

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+# Form
+
+The shared model implemented by both root form types (`MutationForm.md`, `LensForm.md`) and every subform focused from them. A schema is the single source of truth for shape, validation, and the decoded value the application receives; `Form` supplies reactive state and lifecycle on top of it — it does not render anything.
+
+A schema distinguishes the **encoded value** the UI edits from the **decoded value** the application uses:
+
+```tsx
+import { Schema } from "effect"
+
+const ProfileSchema = Schema.Struct({
+  displayName: Schema.String.check(Schema.isMinLength(1, { message: "Enter a display name" })),
+  age: Schema.NumberFromString, // input edits a string, app gets a number
+  contact: Schema.Struct({
+    email: Schema.String.check(Schema.isPattern(/^[^\s@]+@[^\s@]+\.[^\s@]+$/, { message: "Enter a valid email" })),
+  }),
+})
+```
+
+## The Form interface
+
+| Member | Meaning |
+|---|---|
+| `encodedValue` | writable input-shaped state (a `Lens`) |
+| `value` | decoded value as `Option<A>`; `None` until decoding succeeds |
+| `issues` | Standard Schema issues scoped to this form's path |
+| `isValidating` | whether schema decoding is currently running |
+| `canCommit` | whether the root has a valid value and is ready to commit |
+| `isCommitting` | whether a mutation or target write is in progress |
+
+There is no separate "field" type — a field is just a `Form` focused on part of its parent.
+
+## Focus into subforms
+
+```tsx
+const displayNameField = Form.focusObjectOn(form, "displayName")
+const contactForm = Form.focusObjectOn(form, "contact")
+const emailField = form.pipe(Form.focusObjectOn("contact"), Form.focusObjectOn("email"))
+```
+
+- `Form.focusObjectOn` (struct key), `Form.focusArrayAt` (array index), `Form.focusTupleAt` (tuple index), `Form.focusChunkAt` (Chunk index). All are dual API: data-first, or curried for chaining through nested paths with `pipe`.
+- A focused form exposes `encodedValue`/`value`/`issues` scoped to that path; `isValidating`/`canCommit`/`isCommitting` stay connected to the root form.
+- Focus once (e.g. at component setup), not on every render.
+
+## Bind a subform to an input
+
+```tsx
+const input = yield* Form.useInput(emailField, { debounce: "250 millis" })
+<input value={input.value} onChange={e => input.setValue(e.currentTarget.value)} />
+```
+
+- `Form.useInput(form, { debounce? })` returns `{ value, setValue }` from the subform's encoded value. `setValue` writes the form and re-runs the schema pipeline. `debounce` delays propagation to the form (the displayed value updates immediately) — useful for text inputs to avoid validating every keystroke.
+- `Form.useOptionalInput(form, { defaultValue, debounce? })` is for a field whose encoded value is `Option<I>`: returns `{ value, setValue, enabled, setEnabled }` for a togglable optional input. `value`/`setValue` operate on the unwrapped `I`; `defaultValue` is used as `value` while `enabled` is `false` (i.e. while the encoded field is `None`), and `defaultValue` is required.
+- `Form.useStatus(form, { debounce? })` returns `{ isValidating, isCommitting, canCommit }`, debounced (default 250ms) to avoid flicker in pending indicators.
+
+These hooks are building blocks for your own reusable input components — wrap them once to handle labels, issues, disabled state, and styling consistently; both hooks accept any `Form.Form`, so the same input component works with subforms from `MutationForm` or `LensForm`.
+
+## Schema-owned conversions
+
+Because the schema defines both directions, it can own an entire domain conversion — e.g. a local `datetime-local` input string decoding to a UTC `DateTime.Utc` and back — with no manual parsing in components. See `MutationForm.md` for a complete example (`DateTimeUtcFromZonedInput`).

packages/effect-view/ai-docs/LensForm.md

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+# LensForm
+
+A root form (implements `Form.Form`, see `Form.md`) that keeps an encoded draft synchronized in both directions with a target `Lens` of decoded application data. Use for settings panels, inspectors, and edit screens where a valid change should update existing state without a final submit.
+
+```tsx
+import { Effect, SubscriptionRef } from "effect"
+import { Component, Lens, LensForm, View } from "effect-view"
+
+const [form, profile] = yield* Component.useOnMount(() =>
+  Effect.gen(function* () {
+    const profile = Lens.fromSubscriptionRef(
+      yield* SubscriptionRef.make({ displayName: "Ada", age: 37, contact: { email: "ada@example.com" } }),
+    )
+    const form = yield* LensForm.make({ schema: ProfileSchema, target: profile }).pipe(LensForm.thenRun)
+    return [form, profile] as const
+  }),
+)
+
+const [savedProfile, isCommitting] = yield* View.useAll([profile, form.isCommitting])
+```
+
+- `LensForm.make({ schema, target, initialEncodedValue? })` — `target` holds decoded data. `LensForm.thenRun` starts synchronization.
+- A valid edit is decoded and written to `target` automatically; an invalid edit stays in the form (so the user can correct it) and never reaches `target`. If something else updates `target`, `LensForm` encodes that value back into the draft.
+- Pass `initialEncodedValue` only when the first draft should differ from the encoded target; otherwise `LensForm.make` derives the initial draft by encoding the current target through the schema.
+- No `submit` method — commits happen continuously as valid edits arrive. Focus into subforms/fields with `Form.focusObjectOn`/etc. and bind with `Form.useInput` exactly as with `MutationForm` (see `Form.md`).

packages/effect-view/ai-docs/Mutation.md

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+# Mutation
+
+effect-view's counterpart to TanStack Query mutations: user-triggered asynchronous work (save, delete, upload, send) as an Effect. No cache, no reactive key, no automatic execution — it runs only when called.
+
+| TanStack Mutation | effect-view |
+|---|---|
+| mutation variables | the input key `K` |
+| `mutationFn` | `f: (key: K) => Effect<A, E, R>` |
+| mutation result | `mutation.state`, a `View<{ key: Option<K>; result: AsyncResult<A, E> }>` |
+| `isPending` | `state.result.waiting` |
+| `mutateAsync` | `mutation.mutate(key)` |
+| start without awaiting | `mutation.mutateView(key)` |
+
+## Create
+
+```tsx
+import { Mutation } from "effect-view"
+
+const mutation = yield* Component.useOnMount(() =>
+  Mutation.make({ f: (input: InviteInput) => sendInvite(input) }),
+)
+```
+
+`Mutation.make({ f })` is an Effect constructor, not a hook — create each instance once (`Component.useOnMount` for component-owned, an Effect service for shared) and keep it stable. `f` keeps its full `Effect<A, E, R>` type; required services are captured from the creation context, so callbacks don't reconstruct dependencies. Fibers belong to the creation scope and are interrupted if that scope closes while running.
+
+## AsyncResult state
+
+`mutation.state` is a `View` of `{ key: Option<K>, result: AsyncResult<A, E> }`. `result` starts `Initial` (`waiting: false`); calling `mutate`/`mutateView` sets `waiting: true`, then publishes `Success` or `Failure`. Match on `state.result`, not `state` itself:
+
+```tsx
+import { AsyncResult } from "effect/unstable/reactivity"
+
+const [state] = yield* View.useAll([mutation.state])
+
+AsyncResult.match(state.result, {
+  onInitial: ({ waiting }) => (...),
+  onFailure: ({ cause, previousSuccess, waiting }) => (...), // cause: Cause<E>
+  onSuccess: ({ value, waiting }) => (...),
+})
+```
+
+`waiting` is independent of the result tag: after one success, starting another call keeps the value visible while `waiting: true`; if that call fails, the failure can retain `previousSuccess`. Failures carry a full `Cause<E>`.
+
+## mutate vs mutateView
+
+| Method | Returns | Use for |
+|---|---|---|
+| `mutate(key)` | the final `FinalMutationState` (`{ key: Option.Some<K>, result: Success \| Failure }`) | an Effect workflow that needs the outcome |
+| `mutateView(key)` | a live per-call `View<{ key: Option.Some<K>, result: AsyncResult<A, E> }>` | a UI callback that just starts the work |
+
+```tsx
+const runPromise = yield* Component.useRunPromise()
+void runPromise(Effect.gen(function* () {
+  const final = yield* mutation.mutate(input)
+  if (AsyncResult.isSuccess(final.result)) yield* Effect.log(`Saved ${final.result.value.id}`)
+}))
+```
+
+```tsx
+const runSync = yield* Component.useRunSync()
+const state = runSync(mutation.mutateView(input)) // a View for this specific call
+```
+
+The mutation Effect never fails with `E` itself — it captures the operation's `Exit` and always resolves to a final state wrapping an `AsyncResult.Success`/`Failure`.
+
+## Reactive metadata
+
+| Member | Meaning |
+|---|---|
+| `state` | latest mutation state, shared `View` |
+| `latestKey` | most recent input, `Option<K>` |
+| `latestFinalState` | latest completed final state, `Option<FinalMutationState<K, A, E>>` |
+| `fiber` | most recently started mutation fiber, `Option` |
+
+## Concurrency
+
+Starting a mutation does not interrupt an earlier one — calls can overlap, each with its own `mutateView` state; `mutation.state` reflects whichever update arrived last. For a single submit button, disabling while `result.waiting` is usually enough. Use per-call `mutateView` Views (e.g. per uploaded file) when concurrent operations each need their own progress indicator.
+
+## Updating queries after a mutation
+
+Mutations never auto-invalidate `Query` caches — compose it explicitly:
+
+```tsx
+const final = yield* updatePost.mutate(input)
+if (AsyncResult.isSuccess(final.result)) {
+  yield* posts.invalidateCacheEntry(["post", final.result.value.id] as const)
+  yield* posts.refreshView // invalidation alone does not refetch
+}
+```

packages/effect-view/ai-docs/MutationForm.md

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+# MutationForm
+
+A root form (implements `Form.Form`, see `Form.md`) that owns a local encoded draft and passes the valid decoded value to a `Mutation` when `submit` runs. Use for registration, checkout, search — any workflow with an explicit submit action.
+
+```tsx
+import { Effect } from "effect"
+import { Component, MutationForm, View } from "effect-view"
+
+const form = yield* Component.useOnMount(() =>
+  MutationForm.make({
+    schema: ProfileSchema,
+    initialEncodedValue: { displayName: "", age: "", contact: { email: "" } },
+    f: ([profile, form]) => Effect.log(`Creating ${profile.displayName}, age ${profile.age}`),
+  }).pipe(MutationForm.thenRun),
+)
+
+const [canCommit, isCommitting] = yield* View.useAll([form.canCommit, form.isCommitting])
+const runPromise = yield* Component.useRunPromise()
+
+<button disabled={!canCommit || isCommitting} onClick={() => void runPromise(form.submit)}>
+  {isCommitting ? "Creating..." : "Create profile"}
+</button>
+```
+
+- `MutationForm.make({ schema, initialEncodedValue, f })` constructs the form; the underlying `Mutation`'s input key is the tuple `[decodedValue, form]`, not just the decoded value. Most `f` implementations only destructure the first element (`profile.age` is a number even though the input edited a string); `form` is included so `f` can, if needed, read other form state (e.g. `form.issues`, `form.encodedValue`) while handling the submission. `MutationForm.thenRun` starts initial validation in the current scope.
+- Create once and keep stable — the usual home is `Component.useOnMount`.
+- `form.submit` runs the mutation only when the form can currently commit; schema issues block submission before the mutation ever runs.
+- Focus into subforms/fields with `Form.focusObjectOn`/`focusArrayAt`/etc. (see `Form.md`) and bind them to inputs with `Form.useInput`.
+- If `f` fails with a `Schema.SchemaError`, `form.submit` formats that error into `form.issues` automatically — the same formatting path used for client-side decoding errors — instead of only surfacing it as a mutation failure. Any other failure from `f` is left as the mutation's `Failure` and does not touch `form.issues`.
+
+## Example: schema-owned date conversion
+
+```tsx
+class DateTimeUtcFromZoned extends Schema.transformOrFail(Schema.DateTimeZonedFromSelf, Schema.DateTimeUtcFromSelf, {
+  strict: true,
+  decode: input => ParseResult.succeed(DateTime.toUtc(input)),
+  encode: DateTime.setZoneCurrent,
+}) {}
+
+export class DateTimeUtcFromZonedInput extends Schema.transformOrFail(Schema.String, DateTimeUtcFromZoned, {
+  strict: true,
+  decode: (input, _options, ast) => Effect.flatMap(DateTime.CurrentTimeZone, timeZone =>
+    Option.match(DateTime.makeZoned(input, { timeZone, adjustForTimeZone: true }), {
+      onSome: ParseResult.succeed,
+      onNone: () => ParseResult.fail(new ParseResult.Type(ast, input, "Enter a valid date and time")),
+    })),
+  encode: value => ParseResult.succeed(DateTime.formatIsoZoned(value).slice(0, 16)),
+}) {}
+```
+
+An `<input type="datetime-local">` edits `"2026-07-22T14:30"`; the schema decodes it to a UTC `DateTime.Utc` (`decode(...).pipe requires DateTime.CurrentTimeZone` — provide `DateTime.layerCurrentZoneLocal` in the runtime) and the mutation receives the UTC instant directly. No manual date parsing in the component.

packages/effect-view/ai-docs/PubSub.md

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+# PubSub
+
+Re-exports Effect's `PubSub` module in full (`export * from "effect/PubSub"`) and adds one component hook.
+
+```tsx
+const pubsub = yield* Component.useOnMount(() => Effect.acquireRelease(PubSub.unbounded<A>(), PubSub.shutdown))
+```
+
+`PubSub.useFromReactiveValues(values: DependencyList)` creates a scoped, unbounded `PubSub` on mount and publishes `values` to it every time the dependency array changes (skipping publish once the PubSub has been shut down). Useful for bridging a set of React-tracked reactive values into an Effect `Stream`-based consumer inside the component's scope.

packages/effect-view/ai-docs/Query.md

@@ -0,0 +1,118 @@
+# Query
+
+effect-view's take on TanStack Query: reactive query keys, cached results, stale times, background refresh, window-focus refetching, cache invalidation — but the query function is an `Effect` and the observable state is a `View` (see `State.md`).
+
+| TanStack Query | effect-view |
+|---|---|
+| `QueryClient` | the `QueryClient` Effect service (below) |
+| `queryKey` | a reactive key supplied as a `View<K>` |
+| `queryFn` | `f: (key: K) => Effect<A, E, R>` |
+| `useQuery` result | `query.state`, a `View<QueryState<K, A, E>>` |
+| `isFetching` | `result.waiting` |
+| `refetch` | `query.refresh` / `query.refreshView` |
+| `invalidateQueries` | `query.invalidateCache` / `invalidateCacheEntry` |
+
+## QueryClient: the shared cache
+
+Every `Query` reads and writes through a `QueryClient`, the Effect service that owns the cache and its garbage collection. Add it once to the application runtime:
+
+```tsx
+import { Layer } from "effect"
+import { QueryClient, ReactRuntime } from "effect-view"
+
+const AppLive = Layer.empty.pipe(
+  Layer.provideMerge(QueryClient.layer({
+    defaultStaleTime: "30 seconds",     // default: "0 minutes"
+    defaultRefreshOnWindowFocus: true,  // default: true
+    cacheGcTime: "5 minutes",           // default: "5 minutes"
+  })),
+)
+export const runtime = ReactRuntime.make(AppLive)
+```
+
+`QueryClient.layer(options?)` builds the service and forks its background garbage-collection loop into the layer's scope. Individual queries may override `staleTime`/`refreshOnWindowFocus`; unset options fall back to these client defaults. `cacheGcTime` controls how long a stale, unaccessed cache entry is kept before eviction. You interact with the client only indirectly through `Query` instances — no need to call `QueryClientService` methods directly.
+
+## Create and run a query
+
+```tsx
+import { Effect, Schema, SubscriptionRef } from "effect"
+import { HttpClient } from "effect/unstable/http"
+import { Component, Lens, Query, View } from "effect-view"
+
+const [postId, query] = yield* Component.useOnMount(() =>
+  Effect.gen(function* () {
+    const key = Lens.fromSubscriptionRef(yield* SubscriptionRef.make(["post", 1 as number] as const))
+
+    const query = yield* Query.make({
+      key,
+      staleTime: "1 minute",
+      f: ([, id]) =>
+        HttpClient.HttpClient.pipe(
+          Effect.andThen(client => client.get(`https://example.com/posts/${id}`)),
+          Effect.andThen(res => res.json),
+          Effect.andThen(Schema.decodeUnknownEffect(Post)),
+        ),
+    }).pipe(Query.thenRun)
+
+    return [Lens.focusTupleAt(key, 1), query] as const
+  }),
+)
+```
+
+- `Query.make({ key, f, staleTime?, refreshOnWindowFocus?, keyEquivalence? })` constructs the query; `Query.thenRun` starts watching `key` in the current scope.
+- Create each query once and keep it stable — the usual home is `Component.useOnMount` (component-owned) or an Effect service (shared across components). Change the key, don't recreate the query, when input changes.
+- Keys use Effect equality by default (`keyEquivalence` overrides it). A tuple key plays the same role as `['post', id]` in TanStack Query.
+- `f` keeps its full `Effect<A, E, R>` type: required services, schema decoding, retries, tracing all compose normally. The context is captured at creation time.
+- Changing the key interrupts the previous in-flight request; a fresh cached success or a new run for the new key follows.
+
+## Render AsyncResult
+
+`query.state: View<QueryState<K, A, E>>` where `QueryState = { key: K; result: AsyncResult<A, E> }`.
+
+```tsx
+import { AsyncResult } from "effect/unstable/reactivity"
+
+const [state] = yield* View.useAll([query.state])
+
+AsyncResult.match(state.result, {
+  onInitial: ({ waiting }) => waiting ? <p>Loading...</p> : <p>Not loaded.</p>,
+  onFailure: ({ cause, previousSuccess, waiting }) => (/* cause: Cause<E>, previousSuccess: Option<Success> */),
+  onSuccess: ({ value, waiting }) => (/* value: A, waiting: refreshing in background */),
+})
+```
+
+`waiting` is independent of the result tag: a background refresh keeps a `Success` successful (with its value) while `waiting: true`; a failed refresh can retain `previousSuccess`. Failures carry a full `Cause<E>` (typed errors, defects, interruption), not just `E`.
+
+## Refresh, fetch, invalidate
+
+| Method | Behavior |
+|---|---|
+| `fetch(key)` | fetch a specific key, wait for its final state |
+| `fetchView(key)` | start fetching a key, return immediately as a live state `View` |
+| `refresh` | resolve the current key again, wait for its final state |
+| `refreshView` | resolve the current key again, return immediately as a live `View` |
+| `invalidateCacheEntry(key)` | remove the cached success for one key |
+| `invalidateCache` | remove every cached success for this query |
+
+The `*View` variants suit synchronous UI callbacks (`runSync(query.refreshView)`); the non-`View` variants suit Effect workflows waiting on the outcome. **Invalidating does not refetch by itself** — follow with `refreshView`, a key change, or a later natural fetch.
+
+```ts
+import { Schedule } from "effect"
+
+const query = yield* Query.make(options).pipe(
+  Query.thenRun,
+  Query.withScheduledRefresh(Schedule.spaced("5 minutes").pipe(Schedule.upTo({ times: 3 }))),
+)
+```
+
+`Query.withScheduledRefresh(schedule)` forks a refresh fiber tied to the surrounding scope; cache/`staleTime` rules still apply.
+
+## Staleness and lifetime
+
+- `staleTime` (per query, falls back to `QueryClient` default): how long a successful result satisfies a fetch without re-running `f`. A stale entry stays available as previous data while it refreshes.
+- `cacheGcTime` (on `QueryClient`): entries unused for `staleTime + cacheGcTime` are evicted.
+- `refreshOnWindowFocus` (per query, falls back to `QueryClient` default): re-resolves the current key on window focus. Requires the optional `@effect/platform-browser` package; without it, the option is silently ignored (rest of the API works normally). Also a no-op outside browser environments.
+
+## The Effect touch
+
+Request fibers belong to the creation scope and are interrupted on unmount, key replacement, or scope closure. Results are `View`s usable outside React too. Mutations do not auto-invalidate queries — compose it explicitly (see `Mutation.md`).

packages/effect-view/ai-docs/ReactRuntime.md

@@ -0,0 +1,39 @@
+# ReactRuntime
+
+Owns a managed Effect runtime and exposes it to a React subtree through context. Every effect-view application has exactly one root runtime per independent Effect context tree.
+
+## Create and provide
+
+```tsx
+import { Layer } from "effect"
+import { ReactRuntime } from "effect-view"
+
+const AppLive = Layer.empty // add application layers here
+
+export const runtime = ReactRuntime.make(AppLive)
+```
+
+```tsx
+import { StrictMode } from "react"
+import { createRoot } from "react-dom/client"
+import { ReactRuntime } from "effect-view"
+import { runtime } from "./runtime"
+import { App } from "./App"
+
+createRoot(document.getElementById("root")!).render(
+  <StrictMode>
+    <ReactRuntime.Provider runtime={runtime} fallback={<p>Starting...</p>}>
+      <App />
+    </ReactRuntime.Provider>
+  </StrictMode>,
+)
+```
+
+- `ReactRuntime.make(layer, memoMap?)` builds a `ManagedRuntime` and a `React.Context` in one value. Define it at module scope — never inside a render.
+- `ReactRuntime.Provider` builds the runtime layer (which can suspend, hence `fallback`), makes the resulting context available via React context, and disposes the managed runtime on unmount.
+- With a router, keep the provider above the router provider. Put a React error boundary above it if runtime construction can fail.
+
+## Rules
+
+- One runtime instance per app (or per independent subtree that needs its own root context).
+- `ReactRuntime.Provider` only supplies context; it never builds automatically at other boundaries — `Component.withContext` reads it explicitly.

packages/effect-view/ai-docs/State.md

@@ -0,0 +1,87 @@
+# State: Lens and View
+
+`Lens` and `View` are effect-view's state primitives, re-exported in full from [`effect-lens`](https://www.npmjs.com/package/effect-lens/v/beta) with two React hooks added on top (`Lens.useState`, `View.useAll`). The core data model, constructors, and focus/derive API belong to `effect-lens` — consult its docs for anything not covered here.
+
+- **`View<A>`** is the read-only half: a current value plus a stream of changes. Use it for anything a component should only observe (derived/computed state, `Query`/`Mutation` state, a read-only field exposed by a service).
+- **`Lens<A>`** is a `View<A>` that can also be written to. Every `Lens` is a `View`, so anywhere a `View` is expected, a `Lens` works too.
+
+## Create state
+
+```tsx
+import { SubscriptionRef } from "effect"
+import { Lens } from "effect-view"
+
+const count = Lens.fromSubscriptionRef(yield* SubscriptionRef.make(0))
+```
+
+The usual pattern: build state with an Effect primitive (`SubscriptionRef`), then wrap it as a `Lens` with a matching constructor.
+
+## Where to store it
+
+| Owner | When |
+|---|---|
+| Effect service (`Context.Service` + `Layer`) | shared by multiple components / application-level state |
+| `Component.useOnMount` | owned by one component instance (or a shallow subtree receiving it via props) |
+| plain `React.useState` | simple local UI state with no need for Effect integration, subscriptions, or sharing |
+
+```tsx
+class CounterState extends Context.Service<CounterState, {
+  readonly count: Lens.Lens<number>
+  readonly doubled: View.View<number>
+}>()("CounterState") {
+  static readonly layer = Layer.effect(CounterState, Effect.gen(function* () {
+    const count = Lens.fromSubscriptionRef(yield* SubscriptionRef.make(0))
+    const doubled = View.map(count, n => n * 2) // derived, read-only
+    return { count, doubled } as const
+  }))
+}
+```
+
+## Read: View.useAll
+
+```tsx
+const [count, doubled] = yield* View.useAll([state.count, state.doubled])
+```
+
+- Reads current values during render, then subscribes via a scoped stream and updates React state on change.
+- This is the default way to read a `Lens` too, since `Lens` is a `View`.
+- `View.useAll(views, { equivalence? })` — `equivalence` controls when a combined change across the supplied views counts as meaningful (defaults to comparing element-wise with `Equal.strictEqual()`).
+
+## Write
+
+```tsx
+yield* Lens.update(state.count, n => n + 1)
+yield* Lens.set(state.count, 0)
+```
+
+## Lens.useState — read/write tuple for controlled inputs
+
+Use when a JSX API wants React's `[value, setValue]` shape (controlled `<input>`, checkbox, select, third-party `value`/`onChange` props). If a component only needs to *display* the value, prefer `View.useAll` — reach for `Lens.useState` only where reading and writing need to be wired together in React's local-state shape.
+
+```tsx
+const [name, setName] = yield* Lens.useState(state.name)
+<input value={name} onChange={e => setName(e.currentTarget.value)} />
+```
+
+Calling the setter writes through the `Lens`, so every other subscriber (another `Lens.useState`, or a `View.useAll` elsewhere) sees the update. `Lens.useState(lens, { equivalence? })` controls when a change triggers a re-render. The setter accepts a plain value or a `prev => next` updater, same as `React.useState`'s.
+
+## Focused Lenses
+
+A focused Lens is still a `Lens` — read it with `View.useAll` or `Lens.useState` like any other.
+
+```tsx
+const nameLens = Lens.focusObjectOn(state.profile, "name")
+const cityLens = state.profile.pipe(
+  Lens.focusObjectOn("contact"),
+  Lens.focusObjectOn("address"),
+  Lens.focusObjectOn("city"),
+)
+```
+
+- Focus helpers (`focusObjectOn`, `focusArrayAt`, `focusTupleAt`, `focusChunkAt`, ...) are dual API: data-first (`Lens.focusObjectOn(lens, key)`) or curried for `pipe` chaining through nested paths.
+- Create focused lenses once (e.g. in `Component.useOnMount`), not on every render. Writes through a focused lens propagate to the parent lens.
+- Full focus/derive/custom-write API: see the `effect-lens` docs.
+
+## Bridging plain React state into a Lens
+
+`Lens.useFromReactState([value, setValue])` wraps an existing React state tuple as a `Lens`, keeping both directions in sync — useful when integrating a third-party hook that already owns `[value, setValue]` state.

packages/effect-view/ai-docs/Stream.md

@@ -0,0 +1,12 @@
+# Stream
+
+Re-exports Effect's `Stream` module in full (`export * from "effect/Stream"`) and adds one component hook for consuming a stream as React state.
+
+```tsx
+const latest = yield* Stream.use(someStream)               // Effect<Option<A>, never, R>
+const latest = yield* Stream.use(someStream, initialValue) // Effect<Some<A>, never, R>
+```
+
+`Stream.use(stream, initialValue?)` subscribes to `stream` for the component's lifetime (via a scoped fiber forked in a post-commit effect) and returns the latest emitted value as React state, deduped with strict equality. Without `initialValue` the result starts as `Option.none()` until the first emission; with one, it starts as `Option.some(initialValue)`.
+
+Prefer `View.useAll` (see `State.md`) when the source is already a `View`/`Lens` — reach for `Stream.use` when you have a raw Effect `Stream` to observe directly.

packages/effect-view/package.json

@@ -1,14 +1,16 @@
 {
   "name": "effect-view",
   "description": "Write React function components with Effect",
-  "version": "0.1.4",
+  "version": "0.1.5",
   "type": "module",
   "files": [
     "./README.md",
+    "./AGENTS.md",
     "./src/**/*.ts",
     "./dist/**/*.js",
     "./dist/**/*.js.map",
-    "./dist/**/*.d.ts"
+    "./dist/**/*.d.ts",
+    "./ai-docs/**/*.md"
   ],
   "license": "MIT",
   "repository": {

packages/effect-view/src/Mutation.test.ts

@@ -77,6 +77,29 @@ describe("Mutation", () => {
             expect(result.result.previousSuccess.value.value).toBe("saved")
     })
 
+    it("runs a second mutation with its own key, not the previous one", async () => {
+        const result = await runMutationTest(Effect.gen(function*() {
+            const calls: Array<string> = []
+            const mutation = yield* Mutation.make({
+                f: (key: string) => Effect.sync(() => {
+                    calls.push(key)
+                    return key
+                }),
+            })
+
+            const first = yield* mutation.mutate("a")
+            const second = yield* mutation.mutate("b")
+
+            return { calls, first, second }
+        }))
+
+        expect(result.calls).toEqual(["a", "b"])
+        expect(result.first.key.value).toBe("a")
+        expect(expectSuccessValue(result.first)).toBe("a")
+        expect(result.second.key.value).toBe("b")
+        expect(expectSuccessValue(result.second)).toBe("b")
+    })
+
     it("mutateView returns a waiting state without waiting for completion", async () => {
         const result = await runMutationTest(Effect.gen(function*() {
             const deferred = yield* Deferred.make<string>()

packages/effect-view/src/Mutation.ts

@@ -78,8 +78,10 @@ extends Pipeable.Class implements Mutation<K, A, E, R> {
         Scope.Scope | R
     > {
         return Effect.gen({ self: this }, function*() {
+            const currentKey = Option.some(key) as Option.Some<K>
+
             const previous: MutationState<K, A, E> = Option.getOrElse(yield* Lens.get(this.latestFinalState), () => ({
-                key: Option.some(key) as Option.Some<K>,
+                key: currentKey,
                 result: AsyncResult.initial(),
             }))
             const state = yield* makeMutationStateLens(previous)
@@ -89,17 +91,17 @@ extends Pipeable.Class implements Mutation<K, A, E, R> {
                     state,
                     previous => AsyncResult.match(previous.result, {
                         onInitial: () => ({
-                            key: previous.key,
+                            key: currentKey,
                             result: AsyncResult.initial(true),
                         }),
                         onSuccess: result => ({
-                            key: previous.key,
+                            key: currentKey,
                             result: AsyncResult.success(result.value, {
                                 waiting: true,
                             }),
                         }),
                         onFailure: result => ({
-                            key: previous.key,
+                            key: currentKey,
                             result: AsyncResult.failure(result.cause, {
                                 waiting: true,
                                 previousSuccess: result.previousSuccess,
@@ -108,7 +110,7 @@ extends Pipeable.Class implements Mutation<K, A, E, R> {
                     }
                 )),
 
-                Effect.onExit(this.f(previous.key.value), exit => Effect.gen({ self: this }, function*() {
+                Effect.onExit(this.f(key), exit => Effect.gen({ self: this }, function*() {
                     const fiberId = yield* Effect.fiberId
                     const fiber = yield* Lens.get(this.fiber)
 
@@ -119,24 +121,24 @@ extends Pipeable.Class implements Mutation<K, A, E, R> {
                         state,
                         previous => Exit.match(exit, {
                             onSuccess: v => ({
-                                key: previous.key,
+                                key: currentKey,
                                 result: AsyncResult.success(v),
                             }),
                             onFailure: c => Cause.hasInterruptsOnly(c)
                                 ? previous
                                 : AsyncResult.match(previous.result, {
                                     onInitial: () => ({
-                                        key: previous.key,
+                                        key: currentKey,
                                         result: AsyncResult.failure(c),
                                     }),
                                     onSuccess: v => ({
-                                        key: previous.key,
+                                        key: currentKey,
                                         result: AsyncResult.failure(c, {
                                             previousSuccess: Option.some(v),
                                         }),
                                     }),
                                     onFailure: v => ({
-                                        key: previous.key,
+                                        key: currentKey,
                                         result: AsyncResult.failure(c, {
                                             previousSuccess: v.previousSuccess,
                                         }),

packages/vite-plugin/package.json

@@ -1,7 +1,7 @@
 {
   "name": "@effect-view/vite-plugin",
   "description": "Vite Fast Refresh support for Effect View components",
-  "version": "0.0.1",
+  "version": "0.0.2",
   "type": "module",
   "files": [
     "./README.md",

packages/vite-plugin/src/index.ts

@@ -33,11 +33,10 @@ interface ComponentImports {
 
 interface Definition {
     readonly expression: ts.Expression
-    readonly factoryCall: ts.CallExpression
+    readonly wrapTarget: ts.Expression
     readonly body: ts.FunctionLikeDeclaration | undefined
     readonly id: string
-    readonly pipeline: ts.CallExpression | undefined
-    readonly entrypointIndex: number
+    readonly site: EntrypointSite.Pipe | undefined
 }
 
 const defaultInclude = /\.[cm]?[jt]sx?$/
@@ -140,6 +139,13 @@ const findFactoryCall = (
         if (result)
             return
 
+        // Never look inside a nested function body: a factory call there
+        // belongs to a different, unrelated component (e.g. one composed
+        // dynamically inside this component's own render), not to the
+        // composition shape of the definition being analyzed.
+        if (node !== root && ts.isFunctionLike(node))
+            return
+
         if (ts.isCallExpression(node)) {
             if (isFactoryCallee(node.expression, imports)) {
                 result = {
@@ -165,18 +171,83 @@ const findFactoryCall = (
     return result
 }
 
-const isPipeline = (expression: ts.Expression): expression is ts.CallExpression =>
-    ts.isCallExpression(expression)
-    && ts.isPropertyAccessExpression(expression.expression)
-    && expression.expression.name.text === "pipe"
+const isPipeline = (node: ts.Node): node is ts.CallExpression =>
+    ts.isCallExpression(node)
+    && ts.isPropertyAccessExpression(node.expression)
+    && node.expression.name.text === "pipe"
 
-const isEntrypoint = (expression: ts.Expression): boolean => {
-    if (!ts.isCallExpression(expression))
-        return false
+const entrypointName = (callee: ts.Expression): boolean =>
+    ts.isPropertyAccessExpression(callee)
+    && (callee.name.text === "withRuntime" || callee.name.text === "withContext")
 
-    const callee = expression.expression
-    return ts.isPropertyAccessExpression(callee)
-        && (callee.name.text === "withRuntime" || callee.name.text === "withContext")
+/**
+ * A curried entrypoint call (`withContext(context)`) used as one step of a
+ * `.pipe(...)` chain: the descriptor produced by the preceding steps must be
+ * registered *before* this step runs, since it is what converts the
+ * descriptor into a plain React function component.
+ */
+const isEntrypoint = (expression: ts.Expression): boolean =>
+    ts.isCallExpression(expression) && entrypointName(expression.expression)
+
+/**
+ * The data-first form of an entrypoint call (`withContext(descriptor,
+ * context)`), which can appear anywhere - not only inside a `.pipe(...)`
+ * chain - and always takes the descriptor to convert as its first argument.
+ */
+const isEntrypointDataFirst = (node: ts.Node): node is ts.CallExpression =>
+    ts.isCallExpression(node)
+    && entrypointName(node.expression)
+    && node.arguments.length >= 2
+
+declare namespace EntrypointSite {
+    export interface Pipe {
+        readonly kind: "pipe"
+        readonly pipeCall: ts.CallExpression
+        readonly argIndex: number
+    }
+
+    export interface DataFirst {
+        readonly kind: "dataFirst"
+        readonly call: ts.CallExpression
+    }
+}
+
+type EntrypointSite = EntrypointSite.Pipe | EntrypointSite.DataFirst
+
+/**
+ * Finds where, anywhere within a definition's composition expression, a
+ * descriptor is converted into a plain React function component - whether
+ * through a `.pipe(..., withContext(context))` chain or a direct
+ * `withContext(descriptor, context)` call. Does not look inside nested
+ * function bodies, for the same reason as `findFactoryCall`.
+ */
+const findEntrypointSite = (root: ts.Node): EntrypointSite | undefined => {
+    let result: EntrypointSite | undefined
+
+    const visit = (node: ts.Node): void => {
+        if (result)
+            return
+
+        if (node !== root && ts.isFunctionLike(node))
+            return
+
+        if (isPipeline(node)) {
+            const argIndex = node.arguments.findIndex(isEntrypoint)
+            if (argIndex >= 0) {
+                result = { kind: "pipe", pipeCall: node, argIndex }
+                return
+            }
+        }
+        else if (isEntrypointDataFirst(node)) {
+            result = { kind: "dataFirst", call: node }
+            return
+        }
+
+        ts.forEachChild(node, visit)
+    }
+
+    visit(root)
+    return result
 }
 
 const makeDefinition = (
@@ -185,25 +256,33 @@ const makeDefinition = (
     imports: ComponentImports,
 ): Definition | undefined => {
     const factory = findFactoryCall(expression, imports)
+    const site = findEntrypointSite(expression)
+
+    // A `.pipe(..., withContext(context))` chain always needs the splice
+    // treatment, whether or not a factory call could be found in this same
+    // statement (its base may be a component defined elsewhere).
+    if (site?.kind === "pipe")
+        return { expression, wrapTarget: expression, body: factory?.body, id, site }
+
+    // `withContext(descriptor, context)` always needs its descriptor
+    // argument wrapped directly, since by the time the call returns the
+    // result is a plain function component, not a Component descriptor.
+    if (site?.kind === "dataFirst") {
+        const target = site.call.arguments[0]
+        if (!target)
+            return undefined
+        return { expression, wrapTarget: target, body: factory?.body, id, site: undefined }
+    }
+
+    // No entrypoint conversion happens within this statement: the
+    // descriptor remains a Component.Any throughout, however it got here
+    // (a bare factory call, a `.pipe()` of traits with no withContext, or a
+    // user-defined composition helper wrapping either) - safe to register
+    // the whole expression.
     if (!factory)
         return undefined
 
-    const pipeline = isPipeline(expression) ? expression : undefined
-    if (expression !== factory.factoryCall && !pipeline)
-        return undefined
-
-    const entrypointIndex = pipeline
-        ? pipeline.arguments.findIndex(isEntrypoint)
-        : -1
-
-    return {
-        expression,
-        factoryCall: factory.factoryCall,
-        body: factory.body,
-        id,
-        pipeline,
-        entrypointIndex,
-    }
+    return { expression, wrapTarget: expression, body: factory.body, id, site: undefined }
 }
 
 const collectDefinitions = (
@@ -260,9 +339,19 @@ const collectDefinitions = (
     return definitions
 }
 
+/**
+ * Computes a signature for the *shape* of a component's hook calls: the
+ * ordered sequence of hook names it calls at its top level, ignoring
+ * everything else (argument contents, dependency array entries, unrelated
+ * logic). Two bodies calling the same hooks in the same order hash to the
+ * same signature even if most of their code differs, so edits that don't
+ * touch which hooks run - the overwhelming majority of edits - refresh in
+ * place instead of forcing a remount. This mirrors how React's own Fast
+ * Refresh only forces a remount when the hook call sequence itself changes,
+ * not when a hook's arguments or the surrounding logic change.
+ */
 const hookSignature = (
     body: ts.FunctionLikeDeclaration | undefined,
-    sourceFile: ts.SourceFile,
 ): string => {
     if (!body?.body)
         return "unknown"
@@ -276,14 +365,18 @@ const hookSignature = (
 
         if (ts.isCallExpression(node)) {
             const callee = node.expression
-            const name = ts.isIdentifier(callee)
+            const localName = ts.isIdentifier(callee)
                 ? callee.text
                 : ts.isPropertyAccessExpression(callee)
                     ? callee.name.text
                     : undefined
 
-            if (name && /^use[A-Z0-9]/.test(name))
-                hooks.push(node.getText(sourceFile))
+            if (localName && /^use[A-Z0-9]/.test(localName)) {
+                const qualifier = ts.isPropertyAccessExpression(callee) && ts.isIdentifier(callee.expression)
+                    ? `${callee.expression.text}.`
+                    : ""
+                hooks.push(`${qualifier}${localName}`)
+            }
         }
 
         ts.forEachChild(node, visit)
@@ -384,10 +477,10 @@ export function effectView(
             const edits: Edit[] = []
 
             for (const definition of definitions) {
-                const signature = hookSignature(definition.body, sourceFile)
+                const signature = hookSignature(definition.body)
 
-                if (definition.pipeline && definition.entrypointIndex >= 0) {
-                    const entrypoint = definition.pipeline.arguments[definition.entrypointIndex]
+                if (definition.site?.kind === "pipe") {
+                    const entrypoint = definition.site.pipeCall.arguments[definition.site.argIndex]
                     if (!entrypoint)
                         continue
                     edits.push({
@@ -403,8 +496,8 @@ export function effectView(
                     continue
                 }
 
-                const start = definition.expression.getStart(sourceFile)
-                const end = definition.expression.end
+                const start = definition.wrapTarget.getStart(sourceFile)
+                const end = definition.wrapTarget.end
                 edits.push({
                     start,
                     end,

packages/vite-plugin/src/plugin.test.ts

@@ -135,4 +135,77 @@ export const Legacy = Component.makeUntraced(function*() {
 })
 `)).toBeUndefined()
     })
+
+    it("registers a component wrapped by a user-defined helper function", async () => {
+        const result = await transform(`
+import { Component } from "effect-view"
+
+const withLogging = (view) => view
+
+export const LoggedView = withLogging(Component.make("LoggedView")(function*() {
+    return <div />
+}))
+`)
+
+        expect(result).toContain("__effectViewRefresh(withLogging(Component.make(\"LoggedView\")")
+        expect(result).toContain("\"src/View.tsx:LoggedView\"")
+    })
+
+    it("wraps the descriptor argument of a data-first withContext call", async () => {
+        const result = await transform(`
+import { Component } from "effect-view"
+
+const HomeBase = Component.make("Home")(function*() {
+    return <div />
+})
+
+export const Home = Component.withContext(HomeBase, runtime.context)
+`)
+
+        expect(result).toContain("__effectViewRefresh(Component.make(\"Home\")")
+        expect(result).toContain("Component.withContext(__effectViewRefresh(HomeBase, import.meta.hot, \"src/View.tsx:Home\", \"unknown\", false), runtime.context)")
+    })
+
+    it("keeps the same hook signature when only literal content inside a hook call changes", async () => {
+        const before = await transform(`
+import { Component } from "effect-view"
+export const CounterView = Component.make("CounterView")(function*() {
+    const value = yield* Component.useOnMount(() => loadInitial(1))
+    return <div>{value}</div>
+})
+`)
+        const after = await transform(`
+import { Component } from "effect-view"
+export const CounterView = Component.make("CounterView")(function*() {
+    const value = yield* Component.useOnMount(() => loadInitial(2))
+    return <div>{value}</div>
+})
+`)
+
+        const signatureOf = (code: string | undefined) => code?.match(/"src\/View\.tsx:CounterView", "([a-z0-9]+)"/)?.[1]
+        expect(signatureOf(before)).toBeDefined()
+        expect(signatureOf(before)).toBe(signatureOf(after))
+    })
+
+    it("changes the hook signature when a hook call is added", async () => {
+        const before = await transform(`
+import { Component } from "effect-view"
+export const CounterView = Component.make("CounterView")(function*() {
+    const value = yield* Component.useOnMount(() => loadInitial())
+    return <div>{value}</div>
+})
+`)
+        const after = await transform(`
+import { Component } from "effect-view"
+export const CounterView = Component.make("CounterView")(function*() {
+    const value = yield* Component.useOnMount(() => loadInitial())
+    yield* Component.useReactEffect(() => trackView(), [])
+    return <div>{value}</div>
+})
+`)
+
+        const signatureOf = (code: string | undefined) => code?.match(/"src\/View\.tsx:CounterView", "([a-z0-9]+)"/)?.[1]
+        expect(signatureOf(before)).toBeDefined()
+        expect(signatureOf(before)).not.toBe(signatureOf(after))
+    })
 })