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Nick Gerleman
817fedb0e7
Summary: Pull Request resolved: https://github.com/facebook/react-native/pull/41270 `scheduleCellsToRenderUpdate()` is called in response to new measurements, or component changes. It has logic to decide whether to immediately calculate new state, or to defer it until a later batched period. It will not immediately update state if we don't yet have measurements for cells, but this condition is after another which calculates priority, relying on these measurements. These are garbage if we don't yet have measurements, and trigger an invariant violation in horizontal RTL. This switches around the conditions, to avoid offset resolution if we don't yet have valid measurements. I suspect some "hiPri" renders where cells shift are bugged right now when we update state in response to content size change, before we have new corresponding cell layouts. Changelog: [General][Fixed] - Bail on hiPri render on missing layout data before checking priority Reviewed By: yungsters Differential Revision: D50791506 fbshipit-source-id: 8dbffc37edd2a42f7842c0090d344dcd6f3e3c6d
@react-native/virtualized-lists
Installation
yarn add @react-native/virtualized-lists
Note: We're using yarn to install deps. Feel free to change commands to use npm 3+ and npx if you like
Testing
To run the tests in this package, run the following commands from the React Native root folder:
yarnto install the dependencies. You just need to run this onceyarn jest packages/virtualized-lists.