Fix

packages/effect-fc/src/Component.ts

@@ -505,7 +505,7 @@ export declare namespace withSignature {
 
     export type Result<
         T extends Component<any, any, any, any>,
-        F extends React.FC,
+        F extends Signature,
     > = Omit<T, "use" | "asFunctionComponent"> & {
         readonly use: Effect.Effect<F, never, Exclude<Component.Context<T>, Scope.Scope>>
         asFunctionComponent(
@@ -521,7 +521,9 @@ export const withSignature: {
     <F extends withSignature.Signature, T extends Component<any, any, any, any>>(
         self: T
     ): withSignature.Result<T, F>
-} = Function.dual(1, identity)
+} = (self?: Component<any, any, any, any>): any => self === undefined
+    ? identity
+    : self
 
 /**
  * Creates a new component with modified configuration options while preserving all original behavior.