Remove fbjs/lib/emptyFunction from react-native

Summary: This removes `emptyFunction` usage from react-native.

Reviewed By: yungsters

Differential Revision: D13138187

fbshipit-source-id: eaa327884aac2cabb99024077e3407cb99c946d2

Libraries/Components/TextInput/TextInput.js

@@ -26,7 +26,6 @@ const TouchableWithoutFeedback = require('TouchableWithoutFeedback');
 const UIManager = require('UIManager');
 
 const createReactClass = require('create-react-class');
-const emptyFunction = require('fbjs/lib/emptyFunction');
 const invariant = require('fbjs/lib/invariant');
 const requireNativeComponent = require('requireNativeComponent');
 const warning = require('fbjs/lib/warning');
@@ -276,6 +275,8 @@ type Props = $ReadOnly<{|
   contextMenuHidden?: ?boolean,
 |}>;
 
+const emptyFunctionThatReturnsTrue = () => true;
+
 /**
  * A foundational component for inputting text into the app via a
  * keyboard. Props provide configurability for several features, such as
@@ -999,7 +1000,7 @@ const TextInput = createReactClass({
           onBlur={this._onBlur}
           onChange={this._onChange}
           onSelectionChange={this._onSelectionChange}
-          onSelectionChangeShouldSetResponder={emptyFunction.thatReturnsTrue}
+          onSelectionChangeShouldSetResponder={emptyFunctionThatReturnsTrue}
           text={this._getText()}
         />
       );
@@ -1036,7 +1037,7 @@ const TextInput = createReactClass({
           onContentSizeChange={this.props.onContentSizeChange}
           onSelectionChange={this._onSelectionChange}
           onTextInput={this._onTextInput}
-          onSelectionChangeShouldSetResponder={emptyFunction.thatReturnsTrue}
+          onSelectionChangeShouldSetResponder={emptyFunctionThatReturnsTrue}
           text={this._getText()}
           dataDetectorTypes={this.props.dataDetectorTypes}
           onScroll={this._onScroll}
@@ -1089,7 +1090,7 @@ const TextInput = createReactClass({
         onContentSizeChange={this.props.onContentSizeChange}
         onSelectionChange={this._onSelectionChange}
         onTextInput={this._onTextInput}
-        onSelectionChangeShouldSetResponder={emptyFunction.thatReturnsTrue}
+        onSelectionChangeShouldSetResponder={emptyFunctionThatReturnsTrue}
         text={this._getText()}
         dataDetectorTypes={this.props.dataDetectorTypes}
         onScroll={this._onScroll}

Libraries/Experimental/SwipeableRow/SwipeableRow.js

@@ -17,8 +17,6 @@ const React = require('React');
 const StyleSheet = require('StyleSheet');
 const View = require('View');
 
-const emptyFunction = require('fbjs/lib/emptyFunction');
-
 import type {LayoutEvent, PressEvent} from 'CoreEventTypes';
 import type {GestureState} from 'PanResponder';
 
@@ -55,6 +53,8 @@ const RIGHT_SWIPE_BOUNCE_BACK_DURATION = 300;
 const RIGHT_SWIPE_THRESHOLD = 30 * SLOW_SPEED_SWIPE_FACTOR;
 const DEFAULT_SWIPE_THRESHOLD = 30;
 
+const emptyFunction = () => {};
+
 type Props = $ReadOnly<{|
   children?: ?React.Node,
   isOpen?: ?boolean,

Libraries/vendor/emitter/EventEmitter.js

@@ -14,9 +14,10 @@
 const EmitterSubscription = require('EmitterSubscription');
 const EventSubscriptionVendor = require('EventSubscriptionVendor');
 
-const emptyFunction = require('fbjs/lib/emptyFunction');
 const invariant = require('fbjs/lib/invariant');
 
+const emptyFunctionThatReturnsTrue = () => true;
+
 /**
  * @class EventEmitter
  * @description
@@ -155,10 +156,8 @@ class EventEmitter {
     ] = (this._subscriber.getSubscriptionsForType(eventType): any);
     return subscriptions
       ? subscriptions
-          .filter(emptyFunction.thatReturnsTrue)
-          .map(function(subscription) {
-            return subscription.listener;
-          })
+          .filter(emptyFunctionThatReturnsTrue)
+          .map(subscription => subscription.listener)
       : [];
   }