[Scheduler] Re-throw unhandled errors #19595
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Because `postTask` returns a promise, errors inside a `postTask` callback result in the promise being rejected. If we don't catch those errors, then the browser will report an "Unhandled promise rejection" error. This is a confusing message to see in the console, because the fact that `postTask` is a promise-based API is an implementation detail from the perspective of the developer. "Promise rejection" is a red herring. On the other hand, if we do catch those errors, then we need to report the error to the user in some other way. What we really want is the default error reporting behavior that a normal, non-Promise browser event gets. So, we'll re-throw inside `setTimeout`.
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| // I'm not entirely sure the current `postTask` spec makes sense here. If I | ||
| // catch a `postTask` call, it shouldn't trigger a global error. | ||
| // | ||
| function handleAbortError(error) { |
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Doesn't handleAbortError assume that the only way postTask rejects is via an abort?
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Yeah. I'm pretty sure that's a correct assumption. Since the user code is wrapped in its own try/catch.
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Summary: This sync includes the following changes: - **[eaaf4cbce](facebook/react@eaaf4cbce )**: 17.0.1 //<Dan Abramov>// - **[6f62abb58](facebook/react@6f62abb58 )**: Remove usage of Array#fill ([#20071](facebook/react#20071)) //<Dan Abramov>// - **[40cfe1f48](facebook/react@40cfe1f48 )**: Update CHANGELOG.md //<Dan Abramov>// - **[f021a983a](facebook/react@f021a983a )**: Bump versions for 17 ([#20062](facebook/react#20062)) //<Dan Abramov>// - **[d1bb4d851](facebook/react@d1bb4d851 )**: Profiler: Include ref callbacks in onCommit duration ([#20060](facebook/react#20060)) //<Brian Vaughn>// - **[c59c3dfe5](facebook/react@c59c3dfe5 )**: useRef: Warn about reading or writing mutable values during render ([#18545](facebook/react#18545)) //<Brian Vaughn>// - **[7b6cac952](facebook/react@7b6cac952 )**: Improved Profiler commit hooks test ([#20053](facebook/react#20053)) //<Brian Vaughn>// - **[dfb6a4033](facebook/react@dfb6a4033 )**: [Fast Refresh] Fix crashes caused by rogue Proxies ([#20030](facebook/react#20030)) ([#20039](facebook/react#20039)) //<Kai Riemann>// - **[37cb732c5](facebook/react@37cb732c5 )**: Use bitwise OR to define flag masks ([#20044](facebook/react#20044)) //<Andrew Clark>// - **[eb3181e77](facebook/react@eb3181e77 )**: Add Visibility flag for hiding/unhiding trees ([#20043](facebook/react#20043)) //<Andrew Clark>// - **[0dd809bdf](facebook/react@0dd809bdf )**: Remove last schedulePassiveEffectCallback call ([#20042](facebook/react#20042)) //<Andrew Clark>// - **[8df7b7911](facebook/react@8df7b7911 )**: Remove Passive flag from "before mutation" phase ([#20038](facebook/react#20038)) //<Andrew Clark>// - **[c57fe4a2c](facebook/react@c57fe4a2c )**: ReactIs.isValidElementType Unit Test extended with PureComponent case ([#20033](facebook/react#20033)) //<adasq>// - **[02da938fd](facebook/react@02da938fd )**: Don't double-invoke effects in legacy roots ([#20028](facebook/react#20028)) //<Brian Vaughn>// - **[d95c4938d](facebook/react@d95c4938d )**: [EventSystem] Revise onBeforeBlur propagation mechanics ([#20020](facebook/react#20020)) //<Dominic Gannaway>// - **[f46a80ae1](facebook/react@f46a80ae1 )**: Update outdated links and fix two broken links ([#19985](facebook/react#19985)) //<Saikat Guha>// - **[0a4c7c565](facebook/react@0a4c7c565 )**: [Flight] Don't warn for key, but error for ref ([#19986](facebook/react#19986)) //<Sebastian Markbåge>// - **[993ca533b](facebook/react@993ca533b )**: Enable eager listeners statically ([#19983](facebook/react#19983)) //<Dan Abramov>// - **[40c52de96](facebook/react@40c52de96 )**: [Flight] Add Runtime Errors for Non-serializable Values ([#19980](facebook/react#19980)) //<Sebastian Markbåge>// - **[1992d9730](facebook/react@1992d9730 )**: Revert "Temporarily disable Profiler commit hooks flag ([#19900](facebook/react#19900))" ([#19960](facebook/react#19960)) //<Brian Vaughn>// - **[44d39c4d7](facebook/react@44d39c4d7 )**: Removed skip-error-boundaries modifications from old fork ([#19961](facebook/react#19961)) //<Brian Vaughn>// - **[cc77be957](facebook/react@cc77be957 )**: Remove unnecessary error overriding in ([#19949](facebook/react#19949)) //<Paul Doyle>// - **[97625272a](facebook/react@97625272a )**: Debug tracing tests for CPU bound suspense ([#19943](facebook/react#19943)) //<Brian Vaughn>// - **[43363e279](facebook/react@43363e279 )**: Fix codestyle for typeof comparison ([#19928](facebook/react#19928)) //<Eugene Maslovich>// - **[5427b4657](facebook/react@5427b4657 )**: Temporarily disable Profiler commit hooks flag ([#19900](facebook/react#19900)) //<Brian Vaughn>// - **[1faf9e3dd](facebook/react@1faf9e3dd )**: Suspense for CPU-bound trees ([#19936](facebook/react#19936)) //<Andrew Clark>// - **[7f08e908b](facebook/react@7f08e908b )**: Fix missing context to componentDidMount() when double-invoking lifecycles ([#19935](facebook/react#19935)) //<Brian Vaughn>// - **[9198a5cec](facebook/react@9198a5cec )**: Refactor layout effect methods ([#19895](facebook/react#19895)) //<Brian Vaughn>// - **[ba82eea38](facebook/react@ba82eea38 )**: Remove disableSchedulerTimeoutInWorkLoop flag ([#19902](facebook/react#19902)) //<Andrew Clark>// - **[c63741fb3](facebook/react@c63741fb3 )**: offscreen double invoke effects ([#19523](facebook/react#19523)) //<Luna Ruan>// - **[c6917346f](facebook/react@c6917346f )**: Fixed broken Profiler test ([#19894](facebook/react#19894)) //<Brian Vaughn>// - **[87c023b1c](facebook/react@87c023b1c )**: Profiler onRender only called when we do work ([#19885](facebook/react#19885)) //<Brian Vaughn>// - **[81aaee56a](facebook/react@81aaee56a )**: Don't call onCommit et al if there are no effects ([#19863](facebook/react#19863)) //<Andrew Clark>// - **[7355bf575](facebook/react@7355bf575 )**: Consolidate commit phase hook functions ([#19864](facebook/react#19864)) //<Andrew Clark>// - **[bc6b7b6b1](facebook/react@bc6b7b6b1 )**: Don't trigger lazy in DEV during element creation ([#19871](facebook/react#19871)) //<Dan Abramov>// - **[a774502e0](facebook/react@a774502e0 )**: Use single quotes in getComponentName return ([#19873](facebook/react#19873)) //<Gustavo Saiani>// - **[8b2d3783e](facebook/react@8b2d3783e )**: Use Passive flag to schedule onPostCommit ([#19862](facebook/react#19862)) //<Andrew Clark>// - **[50d9451f3](facebook/react@50d9451f3 )**: Improve DevTools editing interface ([#19774](facebook/react#19774)) //<Brian Vaughn>// - **[6fddca27e](facebook/react@6fddca27e )**: Remove passive intervention flag ([#19849](facebook/react#19849)) //<Dan Abramov>// - **[36df9185c](facebook/react@36df9185c )**: chore(docs): Removed outdated comment about fb.me link ([#19830](facebook/react#19830)) //<Adnaan Bheda>// - **[16fb2b6f9](facebook/react@16fb2b6f9 )**: Moved resetChildLanes into complete work ([#19836](facebook/react#19836)) //<Brian Vaughn>// - **[cc581065d](facebook/react@cc581065d )**: eslint-plugin-react-hooks@4.1.2 //<Dan Abramov>// - **[0044805c8](facebook/react@0044805c8 )**: Update CHANGELOG.md //<Dan Abramov>// - **[0f70d4dd6](facebook/react@0f70d4dd6 )**: Consider components in jsx as missing dependencies in typescript-eslint/parser@4.x ([#19815](facebook/react#19815)) //<Sebastian Silbermann>// - **[84558c61b](facebook/react@84558c61b )**: Don't visit passive effects during layout phase ([#19809](facebook/react#19809)) //<Andrew Clark>// - **[ad8a0a8cd](facebook/react@ad8a0a8cd )**: eslint-plugin-react-hooks@4.1.1 //<Dan Abramov>// - **[77544a0d6](facebook/react@77544a0d6 )**: Update CHANGELOG.md //<Dan Abramov>// - **[ed4fdfc73](facebook/react@ed4fdfc73 )**: test(eslint-plugin-react-hooks): Run with TS parsers >= 2.x ([#19792](facebook/react#19792)) //<Sebastian Silbermann>// - **[cd75f93c0](facebook/react@cd75f93c0 )**: eslint-plugin-react-hooks: fix compatibility with typescript-eslint/parser@4.0.0+ ([#19751](facebook/react#19751)) //<Matthias Schiffer>// - **[781212aab](facebook/react@781212aab )**: Remove double space in test name ([#19762](facebook/react#19762)) //<Gustavo Saiani>// - **[e7b255341](facebook/react@e7b255341 )**: Internal `act`: Flush timers at end of scope ([#19788](facebook/react#19788)) //<Andrew Clark>// - **[d17086c7c](facebook/react@d17086c7c )**: Decouple public, internal act implementation ([#19745](facebook/react#19745)) //<Andrew Clark>// - **[d38ec17b1](facebook/react@d38ec17b1 )**: [Flight] Set dispatcher for duration of performWork() ([#19776](facebook/react#19776)) //<Joseph Savona>// - **[4f3f7eeb7](facebook/react@4f3f7eeb7 )**: Bugfix: Effect clean up when deleting suspended tree ([#19752](facebook/react#19752)) //<Andrew Clark>// - **[7baf9d412](facebook/react@7baf9d412 )**: Combine Flags and SubtreeFlags types ([#19775](facebook/react#19775)) //<Andrew Clark>// - **[166544360](facebook/react@166544360 )**: Rename effect fields ([#19755](facebook/react#19755)) //<Andrew Clark>// - **[708fa77a7](facebook/react@708fa77a7 )**: Decrease expiration time of input updates ([#19772](facebook/react#19772)) //<Andrew Clark>// - **[36df483af](facebook/react@36df483af )**: Add feature flag to disable scheduler timeout in work loop ([#19771](facebook/react#19771)) //<Ricky>// - **[bcc0aa463](facebook/react@bcc0aa463 )**: Revert "Revert "Remove onScroll bubbling flag ([#19535](facebook/react#19535))" ([#19655](facebook/react#19655))" ([#19761](facebook/react#19761)) //<Dan Abramov>// - **[99cae887f](facebook/react@99cae887f )**: Add failing test for passive effect cleanup functions and memoized components ([#19750](facebook/react#19750)) //<Brian Vaughn>// - **[2cfd73c4d](facebook/react@2cfd73c4d )**: Fix typo in comment (Noticable→Noticeable) ([#19737](facebook/react#19737)) //<Ikko Ashimine>// - **[53e622ca7](facebook/react@53e622ca7 )**: Fix instances of function declaration after return ([#19733](facebook/react#19733)) //<Bhumij Gupta>// - **[b7d18c4da](facebook/react@b7d18c4da )**: Support Babel's envName option in React Refresh plugin ([#19009](facebook/react#19009)) //<Kevin Weber>// - **[1f38dcff6](facebook/react@1f38dcff6 )**: Remove withSuspenseConfig ([#19724](facebook/react#19724)) //<Andrew Clark>// - **[1396e4a8f](facebook/react@1396e4a8f )**: Fixes eslint warning when node type is ChainExpression ([#19680](facebook/react#19680)) //<Pascal Fong Kye>// - **[a8500be89](facebook/react@a8500be89 )**: Add `startTransition` as a known stable method ([#19720](facebook/react#19720)) //<Andrew Clark>// - **[380dc95de](facebook/react@380dc95de )**: Revert "Append text string to <Text> error message ([#19581](facebook/react#19581))" ([#19723](facebook/react#19723)) //<Timothy Yung>// - **[ddd1faa19](facebook/react@ddd1faa19 )**: Remove config argument from useTransition ([#19719](facebook/react#19719)) //<Andrew Clark>// - **[92fcd46cc](facebook/react@92fcd46cc )**: Replace SuspenseConfig object with an integer ([#19706](facebook/react#19706)) //<Andrew Clark>// - **[b754caaaf](facebook/react@b754caaaf )**: Enable eager listeners in open source ([#19716](facebook/react#19716)) //<Dan Abramov>// - **[c1ac05215](facebook/react@c1ac05215 )**: [Flight] Support more element types and Hooks for Server and Hybrid Components ([#19711](facebook/react#19711)) //<Dan Abramov>// - **[1eaafc9ad](facebook/react@1eaafc9ad )**: Clean up timeoutMs-related implementation details ([#19704](facebook/react#19704)) //<Andrew Clark>// - **[8da0da093](facebook/react@8da0da093 )**: Disable timeoutMs argument ([#19703](facebook/react#19703)) //<Andrew Clark>// - **[60ba723bf](facebook/react@60ba723bf )**: Add SuspenseList to devTools ([#19684](facebook/react#19684)) //<Ben Pernick>// - **[5564f2c95](facebook/react@5564f2c95 )**: Add React.startTransition ([#19696](facebook/react#19696)) //<Ricky>// - **[c4e0768d7](facebook/react@c4e0768d7 )**: Remove unused argument from `finishConcurrentRender` ([#19689](facebook/react#19689)) //<inottn>// - **[848bb2426](facebook/react@848bb2426 )**: Attach Listeners Eagerly to Roots and Portal Containers ([#19659](facebook/react#19659)) //<Dan Abramov>// - **[d2e914ab4](facebook/react@d2e914ab4 )**: Remove remaining references to effect list ([#19673](facebook/react#19673)) //<Andrew Clark>// - **[d6e433899](facebook/react@d6e433899 )**: Use Global Render Timeout for CPU Suspense ([#19643](facebook/react#19643)) //<Sebastian Markbåge>// - **[64ddef44c](facebook/react@64ddef44c )**: Revert "Remove onScroll bubbling flag ([#19535](facebook/react#19535))" ([#19655](facebook/react#19655)) //<Dan Abramov>// - **[dd651df05](facebook/react@dd651df05 )**: Keep onTouchStart, onTouchMove, and onWheel passive ([#19654](facebook/react#19654)) //<Dan Abramov>// - **[b8fa09e9e](facebook/react@b8fa09e9e )**: provide profiling bundle for react-reconciler ([#19559](facebook/react#19559)) //<Julien Gilli>// - **[23595ff59](facebook/react@23595ff59 )**: Add missing param to safelyCallDestroy() ([#19638](facebook/react#19638)) //<Brian Vaughn>// - **[ee409ea3b](facebook/react@ee409ea3b )**: change destroy to safelyCallDestroy ([#19605](facebook/react#19605)) //<Luna Ruan>// - **[bcca5a6ca](facebook/react@bcca5a6ca )**: Always skip unmounted/unmounting error boundaries ([#19627](facebook/react#19627)) //<Brian Vaughn>// - **[1a41a196b](facebook/react@1a41a196b )**: Append text string to <Text> error message ([#19581](facebook/react#19581)) //<Timothy Yung>// - **[e4afb2fdd](facebook/react@e4afb2fdd )**: eslint-plugin-react-hooks@4.1.0 //<Dan Abramov>// - **[ced05c46c](facebook/react@ced05c46c )**: Update CHANGELOG.md //<Dan Abramov>// - **[702fad4b1](facebook/react@702fad4b1 )**: refactor fb.me redirect link to reactjs.org/link ([#19598](facebook/react#19598)) //<CY Lim>// - **[49cd77d24](facebook/react@49cd77d24 )**: fix: leak strict mode with UMD builds ([#19614](facebook/react#19614)) //<Toru Kobayashi>// - **[ffb749c95](facebook/react@ffb749c95 )**: Improve error boundary handling for unmounted subtrees ([#19542](facebook/react#19542)) //<Brian Vaughn>// - **[9b35dd2fc](facebook/react@9b35dd2fc )**: Permanently removed component stacks from scheduling profiler data ([#19615](facebook/react#19615)) //<Brian Vaughn>// - **[3f8115cdd](facebook/react@3f8115cdd )**: Remove `didTimeout` check from work loop //<Andrew Clark>// - **[9abc2785c](facebook/react@9abc2785c )**: Remove wasteful checks from `shouldYield` //<Andrew Clark>// - **[1d5e10f70](facebook/react@1d5e10f70 )**: [eslint-plugin-react-hooks] Report constant constructions ([#19590](facebook/react#19590)) //<Jordan Eldredge>// - **[dab0854c5](facebook/react@dab0854c5 )**: Move commit passive unmount/mount to CommitWork ([#19599](facebook/react#19599)) //<Sebastian Markbåge>// - **[ccb6c3945](facebook/react@ccb6c3945 )**: Remove unused argument ([#19600](facebook/react#19600)) //<inottn>// - **[629125555](facebook/react@629125555 )**: [Scheduler] Re-throw unhandled errors ([#19595](facebook/react#19595)) //<Andrew Clark>// - **[b8ed6a1aa](facebook/react@b8ed6a1aa )**: [Scheduler] Call postTask directly ([#19551](facebook/react#19551)) //<Andrew Clark>// - **[ce37bfad5](facebook/react@ce37bfad5 )**: Remove resolutions from test renderer package.json ([#19577](facebook/react#19577)) //<Dan Abramov>// - **[2704bb537](facebook/react@2704bb537 )**: Add ReactVersion to SchedulingProfiler render scheduled marks ([#19553](facebook/react#19553)) //<Kartik Choudhary>// - **[0c52e24cb](facebook/react@0c52e24cb )**: Support inner component _debugOwner in memo ([#19556](facebook/react#19556)) //<Brian Vaughn>// - **[0cd9a6de5](facebook/react@0cd9a6de5 )**: Parallelize Jest in CI ([#19552](facebook/react#19552)) //<Andrew Clark>// - **[a63893ff3](facebook/react@a63893ff3 )**: Warn about undefined return value for memo and forwardRef ([#19550](facebook/react#19550)) //<Brian Vaughn>// - **[32ff42868](facebook/react@32ff42868 )**: Add feature flag for setting update lane priority ([#19401](facebook/react#19401)) //<Ricky>// - **[5bdd4c8c6](facebook/react@5bdd4c8c6 )**: Remove unused argument from call to jest method ([#19546](facebook/react#19546)) //<Gustavo Saiani>// - **[a5fed98a9](facebook/react@a5fed98a9 )**: Register more node types that are used later as JSXIdentifiers ([#19514](facebook/react#19514)) //<Mateusz Burzyński>// - **[f77c7b9d7](facebook/react@f77c7b9d7 )**: Re-add discrete flushing timeStamp heuristic (behind flag) ([#19540](facebook/react#19540)) //<Dominic Gannaway>// Changelog: [general] [feature] Upgrade to React 17 Reviewed By: cpojer Differential Revision: D24491201 fbshipit-source-id: c947da9dcccbd614e9dc58f3339b63e24829aca7
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Because `postTask` returns a promise, errors inside a `postTask` callback result in the promise being rejected. If we don't catch those errors, then the browser will report an "Unhandled promise rejection" error. This is a confusing message to see in the console, because the fact that `postTask` is a promise-based API is an implementation detail from the perspective of the developer. "Promise rejection" is a red herring. On the other hand, if we do catch those errors, then we need to report the error to the user in some other way. What we really want is the default error reporting behavior that a normal, non-Promise browser event gets. So, we'll re-throw inside `setTimeout`.
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Because
postTaskreturns a promise, errors inside apostTaskcallback result in the promise being rejected.If we don't catch those errors, then the browser will report an "Unhandled promise rejection" error. This is a confusing message to see in the console, because the fact that
postTaskis a promise-based API is an implementation detail from the perspective of the developer. "Promise rejection" is a red herring.On the other hand, if we do catch those errors, then we need to report the error to the user in some other way.
What we really want is the default error reporting behavior that a normal, non-Promise browser event gets.
So, we'll re-throw inside
setTimeout.