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

@@ -1,4 +1,5 @@
-import { Effectable, Schema, type Pipeable } from "effect"
+import { Effectable, Option, Schema, Subscribable, SubscriptionRef, type ParseResult, type Pipeable } from "effect"
+import type * as PropertyPath from "./PropertyPath.js"
 
 
 export const TypeId: unique symbol = Symbol.for("effect-fc/types/Form")
@@ -7,9 +8,20 @@ export type TypeId = typeof TypeId
 export interface Form<in out A, in out I = A, out R = never>
 extends Pipeable.Pipeable {
     readonly schema: Schema.Schema<A, I, R>
+    readonly valueRef: SubscriptionRef.SubscriptionRef<A>
+    readonly errorSubscribable: Subscribable.Subscribable<Option.Option<ParseResult.ParseError>>
+
+    useRef<P extends PropertyPath.Paths<A>>(path: P): SubscriptionRef.SubscriptionRef<PropertyPath.ValueFromPath<A, P>>
+    useIssues(path: PropertyPath.Paths<A>): readonly ParseResult.ParseIssue[]
 }
 
 class FormImpl<in out A, in out I, out R>
-extends Effectable.Class<> implements Form<> {
+extends Effectable.Class<> implements Form<A, I, R> {
     readonly [TypeId]: TypeId = TypeId
 }
+
+
+const TestSchema = Schema.Struct({
+    name: Schema.String
+})
+declare const form: Form<typeof TestSchema["Type"], typeof TestSchema["Encoded"], typeof TestSchema["Context"]>

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

@@ -3,9 +3,9 @@ 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> = [] | (
+export type Paths<T, D extends number = 5, Seen = never> = readonly [] | (
-    D extends never ? [] :
+    D extends never ? readonly [] :
-    T extends Seen ? [] :
+    T extends Seen ? readonly [] :
     T extends readonly any[] ? ArrayPaths<T, D, Seen | T> :
     T extends object ? ObjectPaths<T, D, Seen | T> :
     never
@@ -13,8 +13,8 @@ export type Paths<T, D extends number = 5, Seen = never> = [] | (
 
 export type ArrayPaths<T extends readonly any[], D extends number, Seen> = {
     [K in keyof T as K extends number ? K : never]:
-        | [K]
+        | readonly [K]
-        | [K, ...Paths<T[K], Prev[D], Seen>]
+        | readonly [K, ...Paths<T[K], Prev[D], Seen>]
 } extends infer O
     ? O[keyof O]
     : never
@@ -22,13 +22,13 @@ export type ArrayPaths<T extends readonly any[], D extends number, Seen> = {
 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>]
+            ? readonly [K] | readonly [K, ...Paths<V, Prev[D], Seen>]
             : never
 } extends infer O
     ? O[keyof O]
     : never
 
-export type ValueFromPath<T, P extends any[]> = P extends [infer Head, ...infer Tail]
+export type ValueFromPath<T, P extends readonly any[]> = P extends [infer Head, ...infer Tail]
     ? Head extends keyof T
         ? ValueFromPath<T[Head], Tail>
         : T extends readonly any[]