Refactor Form

packages/effect-fc/package.json

@@ -46,6 +46,6 @@
     "react": "^19.2.0"
   },
   "dependencies": {
-    "effect-lens": "^0.1.1"
+    "effect-lens": "^0.1.2"
   }
 }

packages/effect-fc/src/Form.ts

@@ -232,7 +232,26 @@ export const service = <A, I = A, R = never, MA = void, ME = never, MR = never,
     form => Effect.forkScoped(form.run),
 )
 
+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> => {
+    const form = self as FormImpl<P, A, I, ER, EW>
+    const path = [...form.path, key] as const
 
+    return new FormImpl(
+        path,
+        Lens.map(
+            form.value,
+            a => Option.map(a, v => v[key]),
+            (a, b) => Option.map(),
+        ),
+        Lens.focusObjectField(form.encodedValue, key),
+        form.error,
+        form.validationFiber,
+        form.canSubmit,
+    )
+}
 
 
 export namespace useInput {