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[DevTools] Update Fiber logic in backend renderer to match implementation in React #22527

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Merged
jstejada merged 2 commits into from
Oct 8, 2021
Merged

[DevTools] Update Fiber logic in backend renderer to match implementation in React #22527

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c2abf11
[DevTools] Update isMountedImpl to match implementation in React
Oct 8, 2021
75e3f24
Also sync findCurrentFiberUsingSlowPathById
Oct 8, 2021
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61 changes: 20 additions & 41 deletions packages/react-devtools-shared/src/backend/renderer.js
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Original file line number Diff line number Diff line change
Expand Up @@ -128,6 +128,7 @@ type ReactTypeOfSideEffectType = {|
PerformedWork: number,
Placement: number,
Incomplete: number,
Hydrating: number,
|};

function getFiberFlags(fiber: Fiber): number {
Expand Down Expand Up @@ -156,6 +157,7 @@ export function getInternalReactConstants(
PerformedWork: 0b01,
Placement: 0b10,
Incomplete: 0b10000000000000,
Hydrating: 0b0000000000001000000000000,
};

// **********************************************************
Expand Down Expand Up @@ -526,7 +528,7 @@ export function attach(
} = getInternalReactConstants(version);
const {
DidCapture,
Incomplete,
Hydrating,
NoFlags,
PerformedWork,
Placement,
Expand Down Expand Up @@ -2707,51 +2709,28 @@ export function attach(
return null;
}

const MOUNTING = 1;
const MOUNTED = 2;
const UNMOUNTED = 3;

// This function is copied from React and should be kept in sync:
// https://github.com/facebook/react/blob/main/packages/react-reconciler/src/ReactFiberTreeReflection.js
function isFiberMountedImpl(fiber: Fiber): number {
function getNearestMountedFiber(fiber: Fiber): null | Fiber {
let node = fiber;
let prevNode = null;
let nearestMounted = fiber;
if (!fiber.alternate) {
// If there is no alternate, this might be a new tree that isn't inserted
// yet. If it is, then it will have a pending insertion effect on it.
if ((getFiberFlags(node) & Placement) !== NoFlags) {
return MOUNTING;
}
// This indicates an error during render.
if ((getFiberFlags(node) & Incomplete) !== NoFlags) {
return UNMOUNTED;
}
while (node.return) {
prevNode = node;
node = node.return;

if ((getFiberFlags(node) & Placement) !== NoFlags) {
return MOUNTING;
}
// This indicates an error during render.
if ((getFiberFlags(node) & Incomplete) !== NoFlags) {
return UNMOUNTED;
let nextNode = node;
do {
node = nextNode;
if ((node.flags & (Placement | Hydrating)) !== NoFlags) {
// This is an insertion or in-progress hydration. The nearest possible
// mounted fiber is the parent but we need to continue to figure out
// if that one is still mounted.
nearestMounted = node.return;
}

// If this node is inside of a timed out suspense subtree, we should also ignore errors/warnings.
const isTimedOutSuspense =
node.tag === SuspenseComponent && node.memoizedState !== null;
if (isTimedOutSuspense) {
// Note that this does not include errors/warnings in the Fallback tree though!
const primaryChildFragment = node.child;
const fallbackChildFragment = primaryChildFragment
? primaryChildFragment.sibling
: null;
if (prevNode !== fallbackChildFragment) {
return UNMOUNTED;
}
}
}
nextNode = node.return;
} while (nextNode);
} else {
while (node.return) {
node = node.return;
Expand All @@ -2760,11 +2739,14 @@ export function attach(
if (node.tag === HostRoot) {
// TODO: Check if this was a nested HostRoot when used with
// renderContainerIntoSubtree.
return MOUNTED;
return nearestMounted;
}
// If we didn't hit the root, that means that we're in an disconnected tree
// that has been unmounted.
return UNMOUNTED;
return null;
}
function isFiberMountedImpl(fiber: Fiber): number {
return getNearestMountedFiber(fiber) === fiber ? MOUNTED : UNMOUNTED;
}

// This function is copied from React and should be kept in sync:
Expand All @@ -2785,9 +2767,6 @@ export function attach(
if (state === UNMOUNTED) {
throw Error('Unable to find node on an unmounted component.');
}
if (state === MOUNTING) {
return null;
}
return fiber;
}
// If we have two possible branches, we'll walk backwards up to the root
Expand Down