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[react-core] Clear more properties in detachFiber #16807

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merged 1 commit into from Sep 17, 2019
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[react-core] Clear more properties in detachFiber #16807

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14 changes: 8 additions & 6 deletions packages/react-reconciler/src/ReactFiberCommitWork.js
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Expand Up @@ -893,6 +893,7 @@ function commitNestedUnmounts(
}

function detachFiber(current: Fiber) {
const alternate = current.alternate;
// Cut off the return pointers to disconnect it from the tree. Ideally, we
// should clear the child pointer of the parent alternate to let this
// get GC:ed but we don't know which for sure which parent is the current
Expand All @@ -903,13 +904,14 @@ function detachFiber(current: Fiber) {
current.memoizedState = null;
current.updateQueue = null;
current.dependencies = null;
const alternate = current.alternate;
current.sibling = null;
current.alternate = null;
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I believe this shouldn’t matter to set which I guess is why the code was structured that way.

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It's not needed but it reduces the amount of code quite a bit by re-using the function (which should be hot). I can go back to the previous way if you feel it's better.

current.firstEffect = null;
current.lastEffect = null;
current.pendingProps = null;
current.memoizedProps = null;
if (alternate !== null) {
alternate.return = null;
alternate.child = null;
alternate.memoizedState = null;
alternate.updateQueue = null;
alternate.dependencies = null;
detachFiber(alternate);
}
}

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