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explicitly show how to add the optional listener

Summary:
The previous example only showed where to add the optional "listener" but didn't show how to make use of it.

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Closes #15576

Differential Revision: D5911716

Pulled By: shergin

fbshipit-source-id: 60023470d23c2cbbde47ab9aa82c7ecef73be467
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geirman authored and facebook-github-bot committed Sep 26, 2017
1 parent 6f6329d commit e3a6be5d37c816fc3abd19d3c9529f09aafb345a
Showing with 2 additions and 1 deletion.
  1. +2 −1 Libraries/Animated/src/AnimatedImplementation.js
@@ -839,12 +839,13 @@ module.exports = {
*```javascript
* onScroll={Animated.event(
* [{nativeEvent: {contentOffset: {x: this._scrollX}}}],
* {listener}, // Optional async listener
* {listener: (event) => console.log(event)}, // Optional async listener
* )}
* ...
* onPanResponderMove: Animated.event([
* null, // raw event arg ignored
* {dx: this._panX}, // gestureState arg
{listener: (event, gestureState) => console.log(event, gestureState)}, // Optional async listener
* ]),
*```
*

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