Summary: This PR fixes the case where the content a VirtualizedList loads with a contentLength of 0, causing a crash in the `renderDebugOverlay` function. The result of that crash is a red screen when turning on debug on FlatList and other VirtualizedList components as described in #24053. [LIST] [FIX] - Fix VirtualizedList debug mode crash Pull Request resolved: https://github.com/facebook/react-native/pull/24058 Differential Revision: D14538317 Pulled By: cpojer fbshipit-source-id: 7b17bf51c388561c517bab1f775a31200abdc5a9
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@ -1169,7 +1169,8 @@ class VirtualizedList extends React.PureComponent<Props, State> {
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_renderDebugOverlay() {
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const normalize =
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this._scrollMetrics.visibleLength / this._scrollMetrics.contentLength;
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this._scrollMetrics.visibleLength /
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(this._scrollMetrics.contentLength || 1);
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const framesInLayout = [];
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const itemCount = this.props.getItemCount(this.props.data);
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for (let ii = 0; ii < itemCount; ii++) {
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