Fix

packages/effect-fc/src/Form.ts

@@ -21,7 +21,7 @@ extends Pipeable.Pipeable {
     ): Subscribable.Subscribable<readonly ParseResult.ArrayFormatterIssue[]>
 
     useInput<P extends PropertyPath.Paths<I>>(
-        path: P
+        options: Form.useInput.Options<I, P>
     ): Effect.Effect<
         Form.useInput.Result<PropertyPath.ValueFromPath<I, P>>,
         ParseResult.ParseError | NoSuchElementException,
@@ -31,9 +31,14 @@ extends Pipeable.Pipeable {
 
 export namespace Form {
     export namespace useInput {
-        export interface Result<I> {
-            readonly value: I
-            readonly setValue: React.Dispatch<React.SetStateAction<I>>
+        export interface Options<I, P extends PropertyPath.Paths<I>> {
+            readonly path: P
+            readonly defaultValue?: PropertyPath.ValueFromPath<NoInfer<I>, NoInfer<P>>
+        }
+
+        export interface Result<T> {
+            readonly value: T
+            readonly setValue: React.Dispatch<React.SetStateAction<T>>
             readonly issues: readonly ParseResult.ArrayFormatterIssue[]
         }
     }
@@ -86,15 +91,24 @@ extends Pipeable.Class() implements Form<A, I, R> {
         }, [this.latestValueRef, ...path])
     }
 
-    useInput<P extends PropertyPath.Paths<I>>(path: P) {
+    useInput<P extends PropertyPath.Paths<I>>(
+        options: Form.useInput.Options<I, P>
+    ) {
         const self = this
         return Effect.gen(function*() {
             const internalValueRef = yield* Hooks.useMemo(() => self.latestValueRef.pipe(
-                Effect.andThen(Schema.encode(self.schema)),
-                Effect.andThen(PropertyPath.get(path)),
+                Effect.andThen(flow(
+                    Schema.encode(self.schema),
+                    Effect.andThen(PropertyPath.get(options.path)),
+                    Effect.catchTag("ParseError", e => options.defaultValue !== undefined && options.defaultValue !== null
+                        ? Effect.succeed(options.defaultValue)
+                        : Effect.fail(e)
+                    ),
+                )),
                 Effect.andThen(SubscriptionRef.make<PropertyPath.ValueFromPath<I, P>>),
-            ), [self.latestValueRef, ...path])
-            const issuesSubscribable = self.useFieldIssuesSubscribable(path)
+            ), [self.latestValueRef, ...options.path])
+
+            const issuesSubscribable = self.useFieldIssuesSubscribable(options.path)
 
             const [value, setValue] = yield* Hooks.useRefState(internalValueRef)
             const [issues] = yield* Hooks.useSubscribe(issuesSubscribable)
@@ -107,7 +121,7 @@ extends Pipeable.Class() implements Form<A, I, R> {
                 ),
                 internalValue => self.latestValueRef.pipe(
                     Effect.andThen(Schema.encode(self.schema)),
-                    Effect.andThen(PropertyPath.immutableSet(path, internalValue)),
+                    Effect.andThen(PropertyPath.immutableSet(options.path, internalValue)),
                     Effect.andThen(flow(
                         Schema.decode(self.schema),
                         Effect.andThen(v => SubscriptionRef.set(self.latestValueRef, v)),
@@ -115,7 +129,7 @@ extends Pipeable.Class() implements Form<A, I, R> {
                         Effect.catchTag("ParseError", e => SubscriptionRef.set(self.errorRef, Option.some(e)))
                     )),
                 ),
-            ), [internalValueRef, self.latestValueRef, self.schema, self.errorRef, ...path])
+            ), [internalValueRef, self.latestValueRef, self.schema, self.errorRef, ...options.path])
 
             return { value, setValue, issues }
         })

packages/example/src/routes/form.tsx

@@ -6,22 +6,22 @@ import { Component, Form } from "effect-fc"
 import { useContext, useFork } from "effect-fc/hooks"
 
 
-const LoginFormSchema = Schema.Struct({
+const RegisterFormSchema = Schema.Struct({
     email: Schema.String,
     password: Schema.String.pipe(Schema.minLength(3)),
 })
 
-class LoginForm extends Effect.Service<LoginForm>()("LoginForm", {
+class RegisterForm extends Effect.Service<RegisterForm>()("RegisterForm", {
     scoped: Form.make({
-        schema: LoginFormSchema,
-        initialValue: { email: "", password: "xxx" },
+        schema: RegisterFormSchema,
+        initialValue: { email: "", password: "" },
     })
 }) {}
 
-class LoginFormComponent extends Component.makeUntraced(function* LoginFormComponent() {
-    const form = yield* LoginForm
-    const emailInput = yield* form.useInput(["email"])
-    const passwordInput = yield* form.useInput(["password"])
+class RegisterPage extends Component.makeUntraced(function* RegisterPage() {
+    const form = yield* RegisterForm
+    const emailInput = yield* form.useInput({ path: ["email"], defaultValue: "" })
+    const passwordInput = yield* form.useInput({ path: ["password"], defaultValue: "" })
 
     yield* useFork(() => Stream.runForEach(form.latestValueSubscribable.changes, Console.log), [])
 
@@ -63,15 +63,15 @@ class LoginFormComponent extends Component.makeUntraced(function* LoginFormCompo
 }) {}
 
 
-const FormRoute = Component.makeUntraced(function* FormRoute() {
-    const context = yield* useContext(LoginForm.Default)
-    const LoginFormComponentFC = yield* Effect.provide(LoginFormComponent, context)
+const RegisterRoute = Component.makeUntraced(function* RegisterRoute() {
+    const context = yield* useContext(RegisterForm.Default)
+    const RegisterRouteFC = yield* Effect.provide(RegisterPage, context)
 
-    return <LoginFormComponentFC />
+    return <RegisterRouteFC />
 }).pipe(
     Component.withRuntime(runtime.context)
 )
 
 export const Route = createFileRoute("/form")({
-    component: FormRoute
+    component: RegisterRoute
 })