Type Animated.event() as an event handler instead of any

packages/react-native/Libraries/Animated/AnimatedEvent.js

@@ -197,7 +197,7 @@ export class AnimatedEvent {
     this._attachedEvent && this._attachedEvent.detach();
   }
 
-  __getHandler(): any | ((...args: any) => void) {
+  __getHandler(): (...args: any) => void {
     if (this.__isNative) {
       if (__DEV__) {
         let validatedMapping = false;

packages/react-native/Libraries/Animated/AnimatedImplementation.js

@@ -576,10 +576,14 @@ function unforkEventImpl(
   }
 }
 
-const eventImpl = function <T>(
+// NOTE: With `useNativeDriver: true` this returns an `AnimatedEvent` instance
+// rather than a callable handler. That object is only ever meant to be handed
+// straight back to an animated component's event prop, so the declared type
+// describes the handler shape both branches are consumed as.
+const eventImpl: <T>(
   argMapping: ReadonlyArray<?Mapping>,
   config: EventConfig<T>,
-): any {
+) => (...args: Array<any>) => void = function (argMapping, config): any {
   const animatedEvent = new AnimatedEvent(argMapping, config);
   if (animatedEvent.__isNative) {
     return animatedEvent;

packages/react-native/ReactNativeApi.d.ts

@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<44990574a74bcc122718d4f6142db8cd>>
+ * @generated SignedSource<<5335b26453a7d4d5bb9b7d54ded6218f>>
  *
  * This file was generated by scripts/js-api/build-types/index.js.
  */
@@ -232,7 +232,7 @@ declare const event: typeof $$AnimatedImplementation.event
 declare const eventImpl: <T>(
   argMapping: ReadonlyArray<Mapping | null | undefined>,
   config: EventConfig<T>,
-) => any
+) => (...args: Array<any>) => void
 declare const findNodeHandle: typeof $$ReactFabric.findNodeHandle
 declare const flatten: typeof $$flattenStyle
 declare const forkEvent: typeof $$AnimatedImplementation.forkEvent

packages/react-native/src/private/animated/__tests__/AnimatedNative-test.js

@@ -369,7 +369,7 @@ describe('Native Animated', () => {
       const value = new Animated.Value(0);
       value.__makeNative();
       const listener = jest.fn();
-      const event = Animated.event([{nativeEvent: {foo: value}}], {
+      const event = new Animated.Event([{nativeEvent: {foo: value}}], {
         useNativeDriver: true,
         listener,
       });