Turn Flow strict mode on for KeyBoard (#22114)

Summary:
Related to #22100

Turn Flow strict mode on for KeyBoard

- [x] npm run prettier
- [ ] npm run flow-check-ios
- [ ] npm run flow-check-android

This error was happend #22101 #22048

[GENERAL] [ENHANCEMENT] [Components/Keyboard/Keyboard.js] - Flow strict mode
Pull Request resolved: #22114

Differential Revision: D12920947

Pulled By: TheSavior

fbshipit-source-id: 8d72019efd4d30032ce4784764e5deb9c60e7b01

Libraries/Components/Keyboard/Keyboard.js

@@ -5,7 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  *
  * @format
- * @flow
+ * @flow strict-local
  */
 
 'use strict';
@@ -121,7 +121,10 @@ let Keyboard = {
  * @param {string} eventName The `nativeEvent` is the string that identifies the event you're listening for.
  * @param {function} callback function to be called when the event fires.
  */
- removeListener(eventName: KeyboardEventName, callback: Function) {
+ removeListener(
+ eventName: KeyboardEventName,
+ callback: KeyboardEventListener,
+ ) {
  invariant(false, 'Dummy method used for documentation');
  },
 
@@ -155,12 +158,12 @@ Keyboard = KeyboardEventEmitter;
 Keyboard.dismiss = dismissKeyboard;
 Keyboard.scheduleLayoutAnimation = function(event: KeyboardEvent) {
  const {duration, easing} = event;
- if (duration) {
+ if (duration != null && duration !== 0) {
  LayoutAnimation.configureNext({
  duration: duration,
  update: {
  duration: duration,
- type: (easing && LayoutAnimation.Types[easing]) || 'keyboard',
+ type: (easing != null && LayoutAnimation.Types[easing]) || 'keyboard',
  },
  });
  }