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FlatList - Add dev validation of the object returned by getItemLayout

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Summary:
Returning an object that doesn't have all the required properties from `getItemLayout` doesn't cause a flow error (maybe because we are using `createAnimatedComponent`) and caused ALL items to be rendered which caused perf issues that were hard to debug (typo lenght -> length -_-). This adds a simple warning in DEV mode using checkPropTypes.

**Test plan**
Tested in RNTester by passing a bad `getItemLayout` function.
![image](https://cloud.githubusercontent.com/assets/2677334/26329030/5b32ba90-3f13-11e7-9190-08f05a5c0682.png)
Closes https://github.com/facebook/react-native/pull/14111

Differential Revision: D5283942

Pulled By: sahrens

fbshipit-source-id: 8909532dfddd8628b7fb3380c198f0dfa88f240a
This commit is contained in:
Janic Duplessis 2017-06-20 10:30:40 -07:00 committed by Facebook Github Bot
parent 407ec0023f
commit a2b0ee0fc3
1 changed files with 13 additions and 0 deletions
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13
Libraries/Lists/VirtualizedList.js
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@ -1097,6 +1097,19 @@ class VirtualizedList extends React.PureComponent<OptionalProps, Props, State> {
if (!frame || frame.index !== index) {
if (getItemLayout) {
frame = getItemLayout(data, index);
if (__DEV__) {
const frameType = PropTypes.shape({
length: PropTypes.number.isRequired,
offset: PropTypes.number.isRequired,
index: PropTypes.number.isRequired,
}).isRequired;
PropTypes.checkPropTypes(
{frame: frameType},
{frame},
'frame',
'VirtualizedList.getItemLayout'
);
}
}
}
return frame;