From 0de3256692a6fa6b8be06f2e6a683239ac4a4311 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Julien=20Valverd=C3=A9?= <julien.valverde@mailo.com>
Date: Mon, 30 Mar 2026 17:00:38 +0200
Subject: [PATCH] Apply dual API

---
 packages/effect-fc/src/Form.ts | 26 +++++++++++++++++++++-----
 1 file changed, 21 insertions(+), 5 deletions(-)

diff --git a/packages/effect-fc/src/Form.ts b/packages/effect-fc/src/Form.ts
index 1a2196e..5c37310 100644
--- a/packages/effect-fc/src/Form.ts
+++ b/packages/effect-fc/src/Form.ts
@@ -1,4 +1,4 @@
-import { Array, Cause, Chunk, type Context, type Duration, Effect, Equal, Exit, Fiber, identity, Option, ParseResult, Pipeable, Predicate, Schema, type Scope, Stream } from "effect"
+import { Array, Cause, Chunk, type Context, type Duration, Effect, Equal, Exit, Fiber, Function, identity, Option, ParseResult, Pipeable, Predicate, Schema, type Scope, Stream } from "effect"
 import type * as React from "react"
 import * as Component from "./Component.js"
 import * as Lens from "./Lens.js"
@@ -246,7 +246,15 @@ const filterIssuesByPath = (
     issue.path.length >= path.length && Array.every(path, (p, i) => p === issue.path[i])
 )
 
-export const focusObjectField = <P extends readonly PropertyKey[], A extends object, I extends object, ER, EW, K extends keyof A & keyof I>(
+export const focusObjectField: {
+    <P extends readonly PropertyKey[], A extends object, I extends object, ER, EW, K extends keyof A & keyof I>(
+        self: Form<P, A, I, ER, EW>,
+        key: K,
+    ): Form<readonly [...P, K], A[K], I[K], ER, EW>
+    <P extends readonly PropertyKey[], A extends object, I extends object, ER, EW, K extends keyof A & keyof I>(
+        key: K,
+    ): (self: Form<P, A, I, ER, EW>) => Form<readonly [...P, K], A[K], I[K], ER, EW>
+} = Function.dual(2, <P extends readonly PropertyKey[], A extends object, I extends object, ER, EW, K extends keyof A & keyof I>(
     self: Form<P, A, I, ER, EW>,
     key: K,
 ): Form<readonly [...P, K], A[K], I[K], ER, EW> => {
@@ -262,9 +270,17 @@ export const focusObjectField = <P extends readonly PropertyKey[], A extends obj
         form.canSubmit,
         form.isSubmitting,
     )
-}
+})
 
-export const focusArrayAt = <P extends readonly PropertyKey[], A extends readonly any[], I extends readonly any[], ER, EW>(
+export const focusArrayAt: {
+    <P extends readonly PropertyKey[], A extends readonly any[], I extends readonly any[], ER, EW>(
+        self: Form<P, A, I, ER, EW>,
+        index: number,
+    ): Form<readonly [...P, number], A[number], I[number], ER | Cause.NoSuchElementException, EW | Cause.NoSuchElementException>
+    <P extends readonly PropertyKey[], A extends readonly any[], I extends readonly any[], ER, EW>(
+        index: number,
+    ): (self: Form<P, A, I, ER, EW>) => Form<readonly [...P, number], A[number], I[number], ER | Cause.NoSuchElementException, EW | Cause.NoSuchElementException>
+} = Function.dual(2, <P extends readonly PropertyKey[], A extends readonly any[], I extends readonly any[], ER, EW>(
     self: Form<P, A, I, ER, EW>,
     index: number,
 ): Form<readonly [...P, number], A[number], I[number], ER | Cause.NoSuchElementException, EW | Cause.NoSuchElementException> => {
@@ -280,7 +296,7 @@ export const focusArrayAt = <P extends readonly PropertyKey[], A extends readonl
         form.canSubmit,
         form.isSubmitting,
     )
-}
+})
 
 
 export namespace useInput {