-
Notifications
You must be signed in to change notification settings - Fork 46.4k
/
ReactFiberBeginWork.js
826 lines (749 loc) · 27.7 KB
/
ReactFiberBeginWork.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
/**
* Copyright (c) 2013-present, Facebook, Inc.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @flow
*/
import type {HostConfig} from 'react-reconciler';
import type {Fiber} from 'react-reconciler/src/ReactFiber';
import type {HostContext} from './ReactFiberHostContext';
import type {HydrationContext} from './ReactFiberHydrationContext';
import type {FiberRoot} from './ReactFiberRoot';
import type {ExpirationTime} from './ReactFiberExpirationTime';
import {
IndeterminateComponent,
FunctionalComponent,
ClassComponent,
HostRoot,
HostComponent,
HostText,
HostPortal,
CallComponent,
CallHandlerPhase,
ReturnComponent,
Fragment,
} from 'shared/ReactTypeOfWork';
import {
PerformedWork,
Placement,
ContentReset,
Err,
Ref,
} from 'shared/ReactTypeOfSideEffect';
import {ReactCurrentOwner} from 'shared/ReactGlobalSharedState';
import {debugRenderPhaseSideEffects} from 'shared/ReactFeatureFlags';
import invariant from 'fbjs/lib/invariant';
import getComponentName from 'shared/getComponentName';
import warning from 'fbjs/lib/warning';
import ReactDebugCurrentFiber from './ReactDebugCurrentFiber';
import {cancelWorkTimer} from './ReactDebugFiberPerf';
import ReactFiberClassComponent from './ReactFiberClassComponent';
import {
mountChildFibers,
reconcileChildFibers,
cloneChildFibers,
} from './ReactChildFiber';
import {processUpdateQueue} from './ReactFiberUpdateQueue';
import {
getMaskedContext,
getUnmaskedContext,
hasContextChanged,
pushContextProvider,
pushTopLevelContextObject,
invalidateContextProvider,
} from './ReactFiberContext';
import {NoWork, Never} from './ReactFiberExpirationTime';
import {AsyncUpdates} from './ReactTypeOfInternalContext';
let warnedAboutStatelessRefs;
let didWarnAboutBadClass;
if (__DEV__) {
warnedAboutStatelessRefs = {};
didWarnAboutBadClass = {};
}
export default function<T, P, I, TI, HI, PI, C, CC, CX, PL>(
config: HostConfig<T, P, I, TI, HI, PI, C, CC, CX, PL>,
hostContext: HostContext<C, CX>,
hydrationContext: HydrationContext<C, CX>,
scheduleWork: (fiber: Fiber, expirationTime: ExpirationTime) => void,
computeExpirationForFiber: (fiber: Fiber) => ExpirationTime,
) {
const {shouldSetTextContent, shouldDeprioritizeSubtree} = config;
const {pushHostContext, pushHostContainer} = hostContext;
const {
enterHydrationState,
resetHydrationState,
tryToClaimNextHydratableInstance,
} = hydrationContext;
const {
adoptClassInstance,
constructClassInstance,
mountClassInstance,
// resumeMountClassInstance,
updateClassInstance,
} = ReactFiberClassComponent(
scheduleWork,
computeExpirationForFiber,
memoizeProps,
memoizeState,
);
// TODO: Remove this and use reconcileChildrenAtExpirationTime directly.
function reconcileChildren(current, workInProgress, nextChildren) {
reconcileChildrenAtExpirationTime(
current,
workInProgress,
nextChildren,
workInProgress.expirationTime,
);
}
function reconcileChildrenAtExpirationTime(
current,
workInProgress,
nextChildren,
renderExpirationTime,
) {
if (current === null) {
// If this is a fresh new component that hasn't been rendered yet, we
// won't update its child set by applying minimal side-effects. Instead,
// we will add them all to the child before it gets rendered. That means
// we can optimize this reconciliation pass by not tracking side-effects.
workInProgress.child = mountChildFibers(
workInProgress,
null,
nextChildren,
renderExpirationTime,
);
} else {
// If the current child is the same as the work in progress, it means that
// we haven't yet started any work on these children. Therefore, we use
// the clone algorithm to create a copy of all the current children.
// If we had any progressed work already, that is invalid at this point so
// let's throw it out.
workInProgress.child = reconcileChildFibers(
workInProgress,
current.child,
nextChildren,
renderExpirationTime,
);
}
}
function updateFragment(current, workInProgress) {
const nextChildren = workInProgress.pendingProps;
if (hasContextChanged()) {
// Normally we can bail out on props equality but if context has changed
// we don't do the bailout and we have to reuse existing props instead.
} else if (
nextChildren === null ||
workInProgress.memoizedProps === nextChildren
) {
return bailoutOnAlreadyFinishedWork(current, workInProgress);
}
reconcileChildren(current, workInProgress, nextChildren);
memoizeProps(workInProgress, nextChildren);
return workInProgress.child;
}
function markRef(current: Fiber | null, workInProgress: Fiber) {
const ref = workInProgress.ref;
if (ref !== null && (!current || current.ref !== ref)) {
// Schedule a Ref effect
workInProgress.effectTag |= Ref;
}
}
function updateFunctionalComponent(current, workInProgress) {
const fn = workInProgress.type;
const nextProps = workInProgress.pendingProps;
if (hasContextChanged()) {
// Normally we can bail out on props equality but if context has changed
// we don't do the bailout and we have to reuse existing props instead.
} else {
if (workInProgress.memoizedProps === nextProps) {
return bailoutOnAlreadyFinishedWork(current, workInProgress);
}
// TODO: consider bringing fn.shouldComponentUpdate() back.
// It used to be here.
}
const unmaskedContext = getUnmaskedContext(workInProgress);
const context = getMaskedContext(workInProgress, unmaskedContext);
let nextChildren;
if (__DEV__) {
ReactCurrentOwner.current = workInProgress;
ReactDebugCurrentFiber.setCurrentPhase('render');
nextChildren = fn(nextProps, context);
ReactDebugCurrentFiber.setCurrentPhase(null);
} else {
nextChildren = fn(nextProps, context);
}
// React DevTools reads this flag.
workInProgress.effectTag |= PerformedWork;
reconcileChildren(current, workInProgress, nextChildren);
memoizeProps(workInProgress, nextProps);
return workInProgress.child;
}
function updateClassComponent(
current: Fiber | null,
workInProgress: Fiber,
renderExpirationTime: ExpirationTime,
) {
// Push context providers early to prevent context stack mismatches.
// During mounting we don't know the child context yet as the instance doesn't exist.
// We will invalidate the child context in finishClassComponent() right after rendering.
const hasContext = pushContextProvider(workInProgress);
let shouldUpdate;
if (current === null) {
if (!workInProgress.stateNode) {
// In the initial pass we might need to construct the instance.
constructClassInstance(workInProgress, workInProgress.pendingProps);
mountClassInstance(workInProgress, renderExpirationTime);
// Simulate an async bailout/interruption by invoking lifecycle twice.
// We do this here rather than inside of ReactFiberClassComponent,
// To more realistically simulate the interruption behavior of async,
// Which would never call componentWillMount() twice on the same instance.
if (debugRenderPhaseSideEffects) {
constructClassInstance(workInProgress, workInProgress.pendingProps);
mountClassInstance(workInProgress, renderExpirationTime);
}
shouldUpdate = true;
} else {
invariant(false, 'Resuming work not yet implemented.');
// In a resume, we'll already have an instance we can reuse.
// shouldUpdate = resumeMountClassInstance(workInProgress, renderExpirationTime);
}
} else {
shouldUpdate = updateClassInstance(
current,
workInProgress,
renderExpirationTime,
);
}
return finishClassComponent(
current,
workInProgress,
shouldUpdate,
hasContext,
);
}
function finishClassComponent(
current: Fiber | null,
workInProgress: Fiber,
shouldUpdate: boolean,
hasContext: boolean,
) {
// Refs should update even if shouldComponentUpdate returns false
markRef(current, workInProgress);
if (!shouldUpdate) {
// Context providers should defer to sCU for rendering
if (hasContext) {
invalidateContextProvider(workInProgress, false);
}
return bailoutOnAlreadyFinishedWork(current, workInProgress);
}
const instance = workInProgress.stateNode;
// Rerender
ReactCurrentOwner.current = workInProgress;
let nextChildren;
if (__DEV__) {
ReactDebugCurrentFiber.setCurrentPhase('render');
nextChildren = instance.render();
if (debugRenderPhaseSideEffects) {
instance.render();
}
ReactDebugCurrentFiber.setCurrentPhase(null);
} else {
if (debugRenderPhaseSideEffects) {
instance.render();
}
nextChildren = instance.render();
}
// React DevTools reads this flag.
workInProgress.effectTag |= PerformedWork;
reconcileChildren(current, workInProgress, nextChildren);
// Memoize props and state using the values we just used to render.
// TODO: Restructure so we never read values from the instance.
memoizeState(workInProgress, instance.state);
memoizeProps(workInProgress, instance.props);
// The context might have changed so we need to recalculate it.
if (hasContext) {
invalidateContextProvider(workInProgress, true);
}
return workInProgress.child;
}
function pushHostRootContext(workInProgress) {
const root = (workInProgress.stateNode: FiberRoot);
if (root.pendingContext) {
pushTopLevelContextObject(
workInProgress,
root.pendingContext,
root.pendingContext !== root.context,
);
} else if (root.context) {
// Should always be set
pushTopLevelContextObject(workInProgress, root.context, false);
}
pushHostContainer(workInProgress, root.containerInfo);
}
function updateHostRoot(current, workInProgress, renderExpirationTime) {
pushHostRootContext(workInProgress);
const updateQueue = workInProgress.updateQueue;
if (updateQueue !== null) {
const prevState = workInProgress.memoizedState;
const state = processUpdateQueue(
current,
workInProgress,
updateQueue,
null,
null,
renderExpirationTime,
);
if (prevState === state) {
// If the state is the same as before, that's a bailout because we had
// no work that expires at this time.
resetHydrationState();
return bailoutOnAlreadyFinishedWork(current, workInProgress);
}
const element = state.element;
const root: FiberRoot = workInProgress.stateNode;
if (
(current === null || current.child === null) &&
root.hydrate &&
enterHydrationState(workInProgress)
) {
// If we don't have any current children this might be the first pass.
// We always try to hydrate. If this isn't a hydration pass there won't
// be any children to hydrate which is effectively the same thing as
// not hydrating.
// This is a bit of a hack. We track the host root as a placement to
// know that we're currently in a mounting state. That way isMounted
// works as expected. We must reset this before committing.
// TODO: Delete this when we delete isMounted and findDOMNode.
workInProgress.effectTag |= Placement;
// Ensure that children mount into this root without tracking
// side-effects. This ensures that we don't store Placement effects on
// nodes that will be hydrated.
workInProgress.child = mountChildFibers(
workInProgress,
null,
element,
renderExpirationTime,
);
} else {
// Otherwise reset hydration state in case we aborted and resumed another
// root.
resetHydrationState();
reconcileChildren(current, workInProgress, element);
}
memoizeState(workInProgress, state);
return workInProgress.child;
}
resetHydrationState();
// If there is no update queue, that's a bailout because the root has no props.
return bailoutOnAlreadyFinishedWork(current, workInProgress);
}
function updateHostComponent(current, workInProgress, renderExpirationTime) {
pushHostContext(workInProgress);
if (current === null) {
tryToClaimNextHydratableInstance(workInProgress);
}
const type = workInProgress.type;
const memoizedProps = workInProgress.memoizedProps;
const nextProps = workInProgress.pendingProps;
const prevProps = current !== null ? current.memoizedProps : null;
if (hasContextChanged()) {
// Normally we can bail out on props equality but if context has changed
// we don't do the bailout and we have to reuse existing props instead.
} else if (memoizedProps === nextProps) {
return bailoutOnAlreadyFinishedWork(current, workInProgress);
}
let nextChildren = nextProps.children;
const isDirectTextChild = shouldSetTextContent(type, nextProps);
if (isDirectTextChild) {
// We special case a direct text child of a host node. This is a common
// case. We won't handle it as a reified child. We will instead handle
// this in the host environment that also have access to this prop. That
// avoids allocating another HostText fiber and traversing it.
nextChildren = null;
} else if (prevProps && shouldSetTextContent(type, prevProps)) {
// If we're switching from a direct text child to a normal child, or to
// empty, we need to schedule the text content to be reset.
workInProgress.effectTag |= ContentReset;
}
markRef(current, workInProgress);
// Check the host config to see if the children are offscreen/hidden.
if (
renderExpirationTime !== Never &&
workInProgress.internalContextTag & AsyncUpdates &&
shouldDeprioritizeSubtree(type, nextProps)
) {
// Down-prioritize the children.
workInProgress.expirationTime = Never;
// Bailout and come back to this fiber later.
return null;
}
reconcileChildren(current, workInProgress, nextChildren);
memoizeProps(workInProgress, nextProps);
return workInProgress.child;
}
function updateHostText(current, workInProgress) {
if (current === null) {
tryToClaimNextHydratableInstance(workInProgress);
}
const nextProps = workInProgress.pendingProps;
memoizeProps(workInProgress, nextProps);
// Nothing to do here. This is terminal. We'll do the completion step
// immediately after.
return null;
}
function mountIndeterminateComponent(
current,
workInProgress,
renderExpirationTime,
) {
invariant(
current === null,
'An indeterminate component should never have mounted. This error is ' +
'likely caused by a bug in React. Please file an issue.',
);
const fn = workInProgress.type;
const props = workInProgress.pendingProps;
const unmaskedContext = getUnmaskedContext(workInProgress);
const context = getMaskedContext(workInProgress, unmaskedContext);
let value;
if (__DEV__) {
if (fn.prototype && typeof fn.prototype.render === 'function') {
const componentName = getComponentName(workInProgress) || 'Unknown';
if (!didWarnAboutBadClass[componentName]) {
warning(
false,
"The <%s /> component appears to have a render method, but doesn't extend React.Component. " +
'This is likely to cause errors. Change %s to extend React.Component instead.',
componentName,
componentName,
);
didWarnAboutBadClass[componentName] = true;
}
}
ReactCurrentOwner.current = workInProgress;
value = fn(props, context);
} else {
value = fn(props, context);
}
// React DevTools reads this flag.
workInProgress.effectTag |= PerformedWork;
if (
typeof value === 'object' &&
value !== null &&
typeof value.render === 'function'
) {
// Proceed under the assumption that this is a class instance
workInProgress.tag = ClassComponent;
// Push context providers early to prevent context stack mismatches.
// During mounting we don't know the child context yet as the instance doesn't exist.
// We will invalidate the child context in finishClassComponent() right after rendering.
const hasContext = pushContextProvider(workInProgress);
adoptClassInstance(workInProgress, value);
mountClassInstance(workInProgress, renderExpirationTime);
return finishClassComponent(current, workInProgress, true, hasContext);
} else {
// Proceed under the assumption that this is a functional component
workInProgress.tag = FunctionalComponent;
if (__DEV__) {
const Component = workInProgress.type;
if (Component) {
warning(
!Component.childContextTypes,
'%s(...): childContextTypes cannot be defined on a functional component.',
Component.displayName || Component.name || 'Component',
);
}
if (workInProgress.ref !== null) {
let info = '';
const ownerName = ReactDebugCurrentFiber.getCurrentFiberOwnerName();
if (ownerName) {
info += '\n\nCheck the render method of `' + ownerName + '`.';
}
let warningKey = ownerName || workInProgress._debugID || '';
const debugSource = workInProgress._debugSource;
if (debugSource) {
warningKey = debugSource.fileName + ':' + debugSource.lineNumber;
}
if (!warnedAboutStatelessRefs[warningKey]) {
warnedAboutStatelessRefs[warningKey] = true;
warning(
false,
'Stateless function components cannot be given refs. ' +
'Attempts to access this ref will fail.%s%s',
info,
ReactDebugCurrentFiber.getCurrentFiberStackAddendum(),
);
}
}
}
reconcileChildren(current, workInProgress, value);
memoizeProps(workInProgress, props);
return workInProgress.child;
}
}
function updateCallComponent(current, workInProgress, renderExpirationTime) {
let nextProps = workInProgress.pendingProps;
if (hasContextChanged()) {
// Normally we can bail out on props equality but if context has changed
// we don't do the bailout and we have to reuse existing props instead.
} else if (workInProgress.memoizedProps === nextProps) {
nextProps = workInProgress.memoizedProps;
// TODO: When bailing out, we might need to return the stateNode instead
// of the child. To check it for work.
// return bailoutOnAlreadyFinishedWork(current, workInProgress);
}
const nextChildren = nextProps.children;
// The following is a fork of reconcileChildrenAtExpirationTime but using
// stateNode to store the child.
if (current === null) {
workInProgress.stateNode = mountChildFibers(
workInProgress,
workInProgress.stateNode,
nextChildren,
renderExpirationTime,
);
} else {
workInProgress.stateNode = reconcileChildFibers(
workInProgress,
current.stateNode,
nextChildren,
renderExpirationTime,
);
}
memoizeProps(workInProgress, nextProps);
// This doesn't take arbitrary time so we could synchronously just begin
// eagerly do the work of workInProgress.child as an optimization.
return workInProgress.stateNode;
}
function updatePortalComponent(
current,
workInProgress,
renderExpirationTime,
) {
pushHostContainer(workInProgress, workInProgress.stateNode.containerInfo);
const nextChildren = workInProgress.pendingProps;
if (hasContextChanged()) {
// Normally we can bail out on props equality but if context has changed
// we don't do the bailout and we have to reuse existing props instead.
} else if (workInProgress.memoizedProps === nextChildren) {
return bailoutOnAlreadyFinishedWork(current, workInProgress);
}
if (current === null) {
// Portals are special because we don't append the children during mount
// but at commit. Therefore we need to track insertions which the normal
// flow doesn't do during mount. This doesn't happen at the root because
// the root always starts with a "current" with a null child.
// TODO: Consider unifying this with how the root works.
workInProgress.child = reconcileChildFibers(
workInProgress,
null,
nextChildren,
renderExpirationTime,
);
memoizeProps(workInProgress, nextChildren);
} else {
reconcileChildren(current, workInProgress, nextChildren);
memoizeProps(workInProgress, nextChildren);
}
return workInProgress.child;
}
/*
function reuseChildrenEffects(returnFiber : Fiber, firstChild : Fiber) {
let child = firstChild;
do {
// Ensure that the first and last effect of the parent corresponds
// to the children's first and last effect.
if (!returnFiber.firstEffect) {
returnFiber.firstEffect = child.firstEffect;
}
if (child.lastEffect) {
if (returnFiber.lastEffect) {
returnFiber.lastEffect.nextEffect = child.firstEffect;
}
returnFiber.lastEffect = child.lastEffect;
}
} while (child = child.sibling);
}
*/
function bailoutOnAlreadyFinishedWork(
current,
workInProgress: Fiber,
): Fiber | null {
cancelWorkTimer(workInProgress);
// TODO: We should ideally be able to bail out early if the children have no
// more work to do. However, since we don't have a separation of this
// Fiber's priority and its children yet - we don't know without doing lots
// of the same work we do anyway. Once we have that separation we can just
// bail out here if the children has no more work at this priority level.
// if (workInProgress.priorityOfChildren <= priorityLevel) {
// // If there are side-effects in these children that have not yet been
// // committed we need to ensure that they get properly transferred up.
// if (current && current.child !== workInProgress.child) {
// reuseChildrenEffects(workInProgress, child);
// }
// return null;
// }
cloneChildFibers(current, workInProgress);
return workInProgress.child;
}
function bailoutOnLowPriority(current, workInProgress) {
cancelWorkTimer(workInProgress);
// TODO: Handle HostComponent tags here as well and call pushHostContext()?
// See PR 8590 discussion for context
switch (workInProgress.tag) {
case HostRoot:
pushHostRootContext(workInProgress);
break;
case ClassComponent:
pushContextProvider(workInProgress);
break;
case HostPortal:
pushHostContainer(
workInProgress,
workInProgress.stateNode.containerInfo,
);
break;
}
// TODO: What if this is currently in progress?
// How can that happen? How is this not being cloned?
return null;
}
// TODO: Delete memoizeProps/State and move to reconcile/bailout instead
function memoizeProps(workInProgress: Fiber, nextProps: any) {
workInProgress.memoizedProps = nextProps;
}
function memoizeState(workInProgress: Fiber, nextState: any) {
workInProgress.memoizedState = nextState;
// Don't reset the updateQueue, in case there are pending updates. Resetting
// is handled by processUpdateQueue.
}
function beginWork(
current: Fiber | null,
workInProgress: Fiber,
renderExpirationTime: ExpirationTime,
): Fiber | null {
if (
workInProgress.expirationTime === NoWork ||
workInProgress.expirationTime > renderExpirationTime
) {
return bailoutOnLowPriority(current, workInProgress);
}
switch (workInProgress.tag) {
case IndeterminateComponent:
return mountIndeterminateComponent(
current,
workInProgress,
renderExpirationTime,
);
case FunctionalComponent:
return updateFunctionalComponent(current, workInProgress);
case ClassComponent:
return updateClassComponent(
current,
workInProgress,
renderExpirationTime,
);
case HostRoot:
return updateHostRoot(current, workInProgress, renderExpirationTime);
case HostComponent:
return updateHostComponent(
current,
workInProgress,
renderExpirationTime,
);
case HostText:
return updateHostText(current, workInProgress);
case CallHandlerPhase:
// This is a restart. Reset the tag to the initial phase.
workInProgress.tag = CallComponent;
// Intentionally fall through since this is now the same.
case CallComponent:
return updateCallComponent(
current,
workInProgress,
renderExpirationTime,
);
case ReturnComponent:
// A return component is just a placeholder, we can just run through the
// next one immediately.
return null;
case HostPortal:
return updatePortalComponent(
current,
workInProgress,
renderExpirationTime,
);
case Fragment:
return updateFragment(current, workInProgress);
default:
invariant(
false,
'Unknown unit of work tag. This error is likely caused by a bug in ' +
'React. Please file an issue.',
);
}
}
function beginFailedWork(
current: Fiber | null,
workInProgress: Fiber,
renderExpirationTime: ExpirationTime,
) {
// Push context providers here to avoid a push/pop context mismatch.
switch (workInProgress.tag) {
case ClassComponent:
pushContextProvider(workInProgress);
break;
case HostRoot:
pushHostRootContext(workInProgress);
break;
default:
invariant(
false,
'Invalid type of work. This error is likely caused by a bug in React. ' +
'Please file an issue.',
);
}
// Add an error effect so we can handle the error during the commit phase
workInProgress.effectTag |= Err;
// This is a weird case where we do "resume" work — work that failed on
// our first attempt. Because we no longer have a notion of "progressed
// deletions," reset the child to the current child to make sure we delete
// it again. TODO: Find a better way to handle this, perhaps during a more
// general overhaul of error handling.
if (current === null) {
workInProgress.child = null;
} else if (workInProgress.child !== current.child) {
workInProgress.child = current.child;
}
if (
workInProgress.expirationTime === NoWork ||
workInProgress.expirationTime > renderExpirationTime
) {
return bailoutOnLowPriority(current, workInProgress);
}
// If we don't bail out, we're going be recomputing our children so we need
// to drop our effect list.
workInProgress.firstEffect = null;
workInProgress.lastEffect = null;
// Unmount the current children as if the component rendered null
const nextChildren = null;
reconcileChildrenAtExpirationTime(
current,
workInProgress,
nextChildren,
renderExpirationTime,
);
if (workInProgress.tag === ClassComponent) {
const instance = workInProgress.stateNode;
workInProgress.memoizedProps = instance.props;
workInProgress.memoizedState = instance.state;
}
return workInProgress.child;
}
return {
beginWork,
beginFailedWork,
};
}