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Temporarily disable "long nested update" warning
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DevTools' timeline profiler warns if an update inside a layout effect
results in an expensive re-render. However, it misattributes renders
that are spawned from a sync render at lower priority. This affects the
new implementation of useDeferredValue but it would also apply to things
like Offscreen.

It's not obvious to me how to fix this given how DevTools models the
idea of a "nested update" so I'm disabling the warning for now to
unblock the bugfix for useDeferredValue.
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acdlite committed Apr 11, 2022
1 parent 422d102 commit e4fd270
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Showing 2 changed files with 13 additions and 4 deletions.
Original file line number Diff line number Diff line change
Expand Up @@ -1463,7 +1463,9 @@ describe('Timeline profiler', () => {
expect(event.warning).toBe(null);
});

it('should warn about long nested (state) updates during layout effects', async () => {
// This is temporarily disabled because the warning doesn't work
// with useDeferredValue
it.skip('should warn about long nested (state) updates during layout effects', async () => {
function Component() {
const [didMount, setDidMount] = React.useState(false);
Scheduler.unstable_yieldValue(
Expand Down Expand Up @@ -1523,7 +1525,9 @@ describe('Timeline profiler', () => {
);
});

it('should warn about long nested (forced) updates during layout effects', async () => {
// This is temporarily disabled because the warning doesn't work
// with useDeferredValue
it.skip('should warn about long nested (forced) updates during layout effects', async () => {
class Component extends React.Component {
_didMount: boolean = false;
componentDidMount() {
Expand Down Expand Up @@ -1654,7 +1658,9 @@ describe('Timeline profiler', () => {
});
});

it('should not warn about deferred value updates scheduled during commit phase', async () => {
// This is temporarily disabled because the warning doesn't work
// with useDeferredValue
it.skip('should not warn about deferred value updates scheduled during commit phase', async () => {
function Component() {
const [value, setValue] = React.useState(0);
const deferredValue = React.useDeferredValue(value);
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Original file line number Diff line number Diff line change
Expand Up @@ -1124,7 +1124,10 @@ export default async function preprocessData(
lane => profilerData.laneToLabelMap.get(lane) === 'Transition',
)
) {
schedulingEvent.warning = WARNING_STRINGS.NESTED_UPDATE;
// FIXME: This warning doesn't account for "nested updates" that are
// spawned by useDeferredValue. Disabling temporarily until we figure
// out the right way to handle this.
// schedulingEvent.warning = WARNING_STRINGS.NESTED_UPDATE;
}
}
});
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