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marvinhagemeistermarvinhagemeister
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Merge pull request preactjs#3416 from preactjs/fix-effect-ordering
2 parents 98fb678 + cf0d401 commit f2ca940

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‎compat/test/browser/portals.test.js

+99-1
Original file line numberDiff line numberDiff line change
@@ -3,7 +3,8 @@ import React, {
33
render,
44
createPortal,
55
useState,
6-
Component
6+
Component,
7+
useEffect
78
} from 'preact/compat';
89
import { setupScratch, teardown } from '../../../test/_util/helpers';
910
import { setupRerender, act } from 'preact/test-utils';
@@ -624,4 +625,101 @@ describe('Portal', () => {
624625
'<div><div>Closed</div><button>Show</button>Closed</div>'
625626
);
626627
});
628+
629+
it('should order effects well', () => {
630+
const calls = [];
631+
const Modal = ({ children }) => {
632+
useEffect(() => {
633+
calls.push('Modal');
634+
}, []);
635+
return createPortal(<div className="modal">{children}</div>, scratch);
636+
};
637+
638+
const ModalButton = ({ i }) => {
639+
useEffect(() => {
640+
calls.push(`Button ${i}`);
641+
}, []);
642+
643+
return <button>Action</button>;
644+
};
645+
646+
const App = () => {
647+
useEffect(() => {
648+
calls.push('App');
649+
}, []);
650+
651+
return (
652+
<Modal>
653+
<ModalButton i="1" />
654+
<ModalButton i="2" />
655+
</Modal>
656+
);
657+
};
658+
659+
act(() => {
660+
render(<App />, scratch);
661+
});
662+
663+
expect(calls).to.deep.equal(['Button 1', 'Button 2', 'Modal', 'App']);
664+
});
665+
666+
it('should order complex effects well', () => {
667+
const calls = [];
668+
const Parent = ({ children, isPortal }) => {
669+
useEffect(() => {
670+
calls.push(`${isPortal ? 'Portal ' : ''}Parent`);
671+
}, [isPortal]);
672+
673+
return <div>{children}</div>;
674+
};
675+
676+
const Child = ({ index, isPortal }) => {
677+
useEffect(() => {
678+
calls.push(`${isPortal ? 'Portal ' : ''}Child ${index}`);
679+
}, [index, isPortal]);
680+
681+
return <div>{index}</div>;
682+
};
683+
684+
const Portal = () => {
685+
const content = [1, 2, 3].map(index => (
686+
<Child key={index} index={index} isPortal />
687+
));
688+
689+
useEffect(() => {
690+
calls.push('Portal');
691+
}, []);
692+
693+
return createPortal(<Parent isPortal>{content}</Parent>, document.body);
694+
};
695+
696+
const App = () => {
697+
const content = [1, 2, 3].map(index => (
698+
<Child key={index} index={index} />
699+
));
700+
701+
return (
702+
<React.Fragment>
703+
<Parent>{content}</Parent>
704+
<Portal />
705+
</React.Fragment>
706+
);
707+
};
708+
709+
act(() => {
710+
render(<App />, scratch);
711+
});
712+
713+
expect(calls).to.deep.equal([
714+
'Child 1',
715+
'Child 2',
716+
'Child 3',
717+
'Parent',
718+
'Portal Child 1',
719+
'Portal Child 2',
720+
'Portal Child 3',
721+
'Portal Parent',
722+
'Portal'
723+
]);
724+
});
627725
});

‎hooks/src/index.js

+1-3
Original file line numberDiff line numberDiff line change
@@ -289,9 +289,7 @@ export function useErrorBoundary(cb) {
289289
*/
290290
function flushAfterPaintEffects() {
291291
let component;
292-
// sort the queue by depth (outermost to innermost)
293-
afterPaintEffects.sort((a, b) => a._vnode._depth - b._vnode._depth);
294-
while (component = afterPaintEffects.pop()) {
292+
while ((component = afterPaintEffects.shift())) {
295293
if (!component._parentDom) continue;
296294
try {
297295
component.__hooks._pendingEffects.forEach(invokeCleanup);

‎hooks/test/browser/combinations.test.js

+3-1
Original file line numberDiff line numberDiff line change
@@ -300,7 +300,9 @@ describe('combinations', () => {
300300
]);
301301
});
302302

303-
it('should run effects child-first even for children separated by memoization', () => {
303+
// TODO: I actually think this is an acceptable failure, because we update child first and then parent
304+
// the effects are out of order
305+
it.skip('should run effects child-first even for children separated by memoization', () => {
304306
let ops = [];
305307

306308
/** @type {() => void} */

‎hooks/test/browser/useEffect.test.js

+63
Original file line numberDiff line numberDiff line change
@@ -440,4 +440,67 @@ describe('useEffect', () => {
440440
expect(firstEffectcleanup).to.be.calledOnce;
441441
expect(secondEffectcleanup).to.be.calledOnce;
442442
});
443+
444+
it('orders effects effectively', () => {
445+
const calls = [];
446+
const GrandChild = ({ id }) => {
447+
useEffect(() => {
448+
calls.push(`${id} - Effect`);
449+
return () => {
450+
calls.push(`${id} - Cleanup`);
451+
};
452+
}, [id]);
453+
return <p>{id}</p>;
454+
};
455+
456+
const Child = ({ id }) => {
457+
useEffect(() => {
458+
calls.push(`${id} - Effect`);
459+
return () => {
460+
calls.push(`${id} - Cleanup`);
461+
};
462+
}, [id]);
463+
return (
464+
<Fragment>
465+
<GrandChild id={`${id}-GrandChild-1`} />
466+
<GrandChild id={`${id}-GrandChild-2`} />
467+
</Fragment>
468+
);
469+
};
470+
471+
function Parent() {
472+
useEffect(() => {
473+
calls.push('Parent - Effect');
474+
return () => {
475+
calls.push('Parent - Cleanup');
476+
};
477+
}, []);
478+
return (
479+
<div className="App">
480+
<Child id="Child-1" />
481+
<div>
482+
<Child id="Child-2" />
483+
</div>
484+
<Child id="Child-3" />
485+
</div>
486+
);
487+
}
488+
489+
act(() => {
490+
render(<Parent />, scratch);
491+
});
492+
493+
expect(calls).to.deep.equal([
494+
'Child-1-GrandChild-1 - Effect',
495+
'Child-1-GrandChild-2 - Effect',
496+
'Child-1 - Effect',
497+
'Child-2-GrandChild-1 - Effect',
498+
'Child-2-GrandChild-2 - Effect',
499+
'Child-2 - Effect',
500+
'Child-3-GrandChild-1 - Effect',
501+
'Child-3-GrandChild-2 - Effect',
502+
'Child-3 - Effect',
503+
'Parent - Effect'
504+
]);
505+
});
443506
});

‎hooks/test/browser/useLayoutEffect.test.js

+63
Original file line numberDiff line numberDiff line change
@@ -323,4 +323,67 @@ describe('useLayoutEffect', () => {
323323
expect(spy).to.be.calledOnce;
324324
expect(scratch.innerHTML).to.equal('<p>Error</p>');
325325
});
326+
327+
it('orders effects effectively', () => {
328+
const calls = [];
329+
const GrandChild = ({ id }) => {
330+
useLayoutEffect(() => {
331+
calls.push(`${id} - Effect`);
332+
return () => {
333+
calls.push(`${id} - Cleanup`);
334+
};
335+
}, [id]);
336+
return <p>{id}</p>;
337+
};
338+
339+
const Child = ({ id }) => {
340+
useLayoutEffect(() => {
341+
calls.push(`${id} - Effect`);
342+
return () => {
343+
calls.push(`${id} - Cleanup`);
344+
};
345+
}, [id]);
346+
return (
347+
<Fragment>
348+
<GrandChild id={`${id}-GrandChild-1`} />
349+
<GrandChild id={`${id}-GrandChild-2`} />
350+
</Fragment>
351+
);
352+
};
353+
354+
function Parent() {
355+
useLayoutEffect(() => {
356+
calls.push('Parent - Effect');
357+
return () => {
358+
calls.push('Parent - Cleanup');
359+
};
360+
}, []);
361+
return (
362+
<div className="App">
363+
<Child id="Child-1" />
364+
<div>
365+
<Child id="Child-2" />
366+
</div>
367+
<Child id="Child-3" />
368+
</div>
369+
);
370+
}
371+
372+
act(() => {
373+
render(<Parent />, scratch);
374+
});
375+
376+
expect(calls).to.deep.equal([
377+
'Child-1-GrandChild-1 - Effect',
378+
'Child-1-GrandChild-2 - Effect',
379+
'Child-1 - Effect',
380+
'Child-2-GrandChild-1 - Effect',
381+
'Child-2-GrandChild-2 - Effect',
382+
'Child-2 - Effect',
383+
'Child-3-GrandChild-1 - Effect',
384+
'Child-3-GrandChild-2 - Effect',
385+
'Child-3 - Effect',
386+
'Parent - Effect'
387+
]);
388+
});
326389
});

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