Remove var in Libraries/Component (#22020)

Summary:
I removed `var` in Libraries/Component.

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

[GENERAL] [ENHANCEMENT] [Libraries/Component] - remove `var`
Pull Request resolved: #22020

Differential Revision: D12843058

Pulled By: TheSavior

fbshipit-source-id: 90723f3905191cbd29cb18474c700ac65f2503cd

Libraries/Components/RefreshControl/RefreshControl.js

@@ -20,15 +20,16 @@ const nullthrows = require('nullthrows');
 import type {ColorValue} from 'StyleSheetTypes';
 import type {ViewProps} from 'ViewPropTypes';
 
+let RefreshLayoutConsts;
 if (Platform.OS === 'android') {
  const AndroidSwipeRefreshLayout = require('UIManager').getViewManagerConfig(
  'AndroidSwipeRefreshLayout',
  );
- var RefreshLayoutConsts = AndroidSwipeRefreshLayout
+ RefreshLayoutConsts = AndroidSwipeRefreshLayout
  ? AndroidSwipeRefreshLayout.Constants
  : {SIZE: {}};
 } else {
- var RefreshLayoutConsts = {SIZE: {}};
+ RefreshLayoutConsts = {SIZE: {}};
 }
 type NativeRefreshControlType = Class<NativeComponent<RefreshControlProps>>;
 

Libraries/Components/TabBarIOS/TabBarItemIOS.ios.js

@@ -132,20 +132,21 @@ class TabBarItemIOS extends React.Component<Props, State> {
  showedDeprecationWarning = true;
  }
  }
- 
+
  render() {
  const {style, children, ...props} = this.props;
 
  // if the tab has already been shown once, always continue to show it so we
  // preserve state between tab transitions
+ let tabContents;
  if (this.state.hasBeenSelected) {
- var tabContents = (
+ tabContents = (
  <StaticContainer shouldUpdate={this.props.selected}>
  {children}
  </StaticContainer>
  );
  } else {
- var tabContents = <View />;
+ tabContents = <View />;
  }
 
  return (