Reset instance vars before calling commit phase lifecycles #10481
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sebmarkbage
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Aug 17, 2017
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@sebmarkbage Updated, now with more programming |
sebmarkbage
reviewed
Aug 17, 2017
| @@ -495,6 +499,8 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>( | |||
| if (__DEV__) { | |||
| startPhaseTimer(finishedWork, 'componentDidMount'); | |||
| } | |||
| instance.props = finishedWork.memoizedProps; | |||
| instance.state = finishedWork.memoizedState; | |||
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Is there any observable way these wouldn't already be the same?
Other than the user setting them themselves? (I suppose if they do, then this is a breaking change now.)
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Not that I can think of, more concerned about the case I can't think of, like how I didn't consider error boundaries. Is this a perf concern?
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I can think of some in async mode, just not sync mode.
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What about async mode? I can't even think of them there.
sebmarkbage
reviewed
Aug 17, 2017
| @@ -505,6 +511,8 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>( | |||
| if (__DEV__) { | |||
| startPhaseTimer(finishedWork, 'componentDidUpdate'); | |||
| } | |||
| instance.props = finishedWork.memoizedProps; | |||
| instance.state = finishedWork.memoizedState; | |||
sebmarkbage
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Aug 17, 2017
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Fixes an issue where if a component throws, its instance variables are not reset before
componentWillUnmountis called. See https://jsfiddle.net/m3pL3yaj/ for an illustration.To protect against issues like this, we should always set
this.propsandthis.stateright before calling a lifecycle method, as if they were explicit arguments.