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

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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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94 changes: 40 additions & 54 deletions packages/react-devtools-shared/src/backend/renderer.js
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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: 0b1000000000000,
};

// **********************************************************
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 +2709,33 @@ 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 assertIsMounted(fiber) {
if (getNearestMountedFiber(fiber) !== fiber) {
throw new Error('Unable to find node on an unmounted component.');
}
}

// 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;
}

// 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;
}
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;
}
}
nextNode = node.return;
} while (nextNode);
} else {
while (node.return) {
node = node.return;
Expand All @@ -2760,11 +2744,11 @@ 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;
}

// This function is copied from React and should be kept in sync:
Expand All @@ -2781,11 +2765,13 @@ export function attach(
const alternate = fiber.alternate;
if (!alternate) {
// If there is no alternate, then we only need to check if it is mounted.
const state = isFiberMountedImpl(fiber);
if (state === UNMOUNTED) {
throw Error('Unable to find node on an unmounted component.');
const nearestMounted = getNearestMountedFiber(fiber);

if (nearestMounted === null) {
throw new Error('Unable to find node on an unmounted component.');
}
if (state === MOUNTING) {

if (nearestMounted !== fiber) {
return null;
}
return fiber;
Expand Down Expand Up @@ -2824,23 +2810,20 @@ export function attach(
while (child) {
if (child === a) {
// We've determined that A is the current branch.
if (isFiberMountedImpl(parentA) !== MOUNTED) {
throw Error('Unable to find node on an unmounted component.');
}
assertIsMounted(parentA);
return fiber;
}
if (child === b) {
// We've determined that B is the current branch.
if (isFiberMountedImpl(parentA) !== MOUNTED) {
throw Error('Unable to find node on an unmounted component.');
}
assertIsMounted(parentA);
return alternate;
}
child = child.sibling;
}

// We should never have an alternate for any mounting node. So the only
// way this could possibly happen is if this was unmounted, if at all.
throw Error('Unable to find node on an unmounted component.');
throw new Error('Unable to find node on an unmounted component.');
}

if (a.return !== b.return) {
Expand Down Expand Up @@ -2891,8 +2874,9 @@ export function attach(
}
child = child.sibling;
}

if (!didFindChild) {
throw Error(
throw new Error(
'Child was not found in either parent set. This indicates a bug ' +
'in React related to the return pointer. Please file an issue.',
);
Expand All @@ -2901,17 +2885,19 @@ export function attach(
}

if (a.alternate !== b) {
throw Error(
throw new Error(
"Return fibers should always be each others' alternates. " +
'This error is likely caused by a bug in React. Please file an issue.',
);
}
}

// If the root is not a host container, we're in a disconnected tree. I.e.
// unmounted.
if (a.tag !== HostRoot) {
throw Error('Unable to find node on an unmounted component.');
throw new Error('Unable to find node on an unmounted component.');
}

if (a.stateNode.current === a) {
// We've determined that A is the current branch.
return fiber;
Expand Down