Detect and warn if use(promise) is wrapped with try/catch block #25543
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
e59c5f8
to
1d87446
Compare
bbf867b
to
4f8c2da
Compare
The old (unstable) mechanism for suspending was to throw a promise. The purpose of throwing is to interrupt the component's execution, and also to signal to React that the interruption was caused by Suspense as opposed to some other error. A flaw is that throwing is meant to be an implementation details — if code in userspace catches the promise, it can lead to unexpected behavior. With `use`, userspace code does not throw promises directly, but `use` itself still needs to throw something to interrupt the component and unwind the stack. The solution is to throw an internal error. In development, we can detect whether the error was caught by a userspace try/catch block and log a warning — though it's not foolproof, since a clever user could catch the object and rethrow it later. The error message includes advice to move `use` outside of the try/catch block. I did not yet implement the warning in Flight.
4f8c2da
to
da38d04
Compare
facebook-github-bot
pushed a commit
to facebook/react-native
that referenced
this pull request
Nov 1, 2022
Summary: This sync includes the following changes: - **[ab075a232](facebook/react@ab075a232 )**: Do not unmount layout effects on initial Offscreen mount ([#25592](facebook/react#25592)) //<Samuel Susla>// - **[765805bf8](facebook/react@765805bf8 )**: Fix type check for null ([#25595](facebook/react#25595)) //<Sebastian Markbåge>// - **[2ac77aab9](facebook/react@2ac77aab9 )**: Clean up vestige of useOpaqueIdentifier ([#25587](facebook/react#25587)) //<Andrew Clark>// - **[bdd3d0807](facebook/react@bdd3d0807 )**: Extract logic for detecting bad fallback to helper //<Andrew Clark>// - **[952dfff3f](facebook/react@952dfff3f )**: Split suspended work loop logic into separate functions //<Andrew Clark>// - **[d2c0ab10d](facebook/react@d2c0ab10d )**: In work loop, add enum of reasons for suspending //<Andrew Clark>// - **[5450dd409](facebook/react@5450dd409 )**: Strict Mode: Reuse memoized result from first pass ([#25583](facebook/react#25583)) //<Andrew Clark>// - **[d2a0176a1](facebook/react@d2a0176a1 )**: Detect and warn if use(promise) is wrapped with try/catch block ([#25543](facebook/react#25543)) //<Andrew Clark>// - **[cf3932be5](facebook/react@cf3932be5 )**: Remove old react-fetch, react-fs and react-pg libraries ([#25577](facebook/react#25577)) //<Sebastian Markbåge>// - **[28a574ea8](facebook/react@28a574ea8 )**: Try assigning fetch to globalThis if global assignment fails ([#25571](facebook/react#25571)) //<Sebastian Markbåge>// - **[09def5990](facebook/react@09def5990 )**: [Float] handle noscript context for Resources ([#25559](facebook/react#25559)) //<Josh Story>// - **[17204056d](facebook/react@17204056d )**: [Float] fix coordination of resource identity and hydration ([#25569](facebook/react#25569)) //<Josh Story>// - **[d925a8d0b](facebook/react@d925a8d0b )**: Flight client error stack ([#25560](facebook/react#25560)) //<Josh Story>// - **[996b00b78](facebook/react@996b00b78 )**: [Tiny] Fixed incorrect import in `react-server-dom-webpack` ([#25554](facebook/react#25554)) //<Leo Lamprecht>// - **[e7c5af45c](facebook/react@e7c5af45c )**: Update cache() and use() to the canary aka next channel ([#25502](facebook/react#25502)) //<Sebastian Markbåge>// - **[fa77f52e7](facebook/react@fa77f52e7 )**: Unify promise switch statements //<Andrew Clark>// - **[7572e4931](facebook/react@7572e4931 )**: Track thenable state in work loop //<Andrew Clark>// - **[7fc3eefd8](facebook/react@7fc3eefd8 )**: Revert yieldy behavior for non-use Suspense (in Flight, too) //<Andrew Clark>// - **[61f9b5e97](facebook/react@61f9b5e97 )**: [Float] support <base> as Resource ([#25546](facebook/react#25546)) //<Josh Story>// - **[1d3fc9c9c](facebook/react@1d3fc9c9c )**: Bug fix when resolving cache ([#25545](facebook/react#25545)) //<Sebastian Markbåge>// - **[cce18e350](facebook/react@cce18e350 )**: [Flight] Use AsyncLocalStorage to extend the scope of the cache to micro tasks ([#25542](facebook/react#25542)) //<Sebastian Markbåge>// - **[caa84c8da](facebook/react@caa84c8da )**: Revert fetch instrumentation to only RSC ([#25540](facebook/react#25540)) //<Sebastian Markbåge>// - **[0c11baa6a](facebook/react@0c11baa6a )**: add warnings for non-resources rendered outside body or head ([#25532](facebook/react#25532)) //<Josh Story>// - **[9236abdb5](facebook/react@9236abdb5 )**: when float is enabled only push title and script as a single unit ([#25536](facebook/react#25536)) //<Josh Story>// - **[dd5c20825](facebook/react@dd5c20825 )**: Revert yieldy behavior for non-use Suspense ([#25537](facebook/react#25537)) //<Andrew Clark>// - **[934177598](facebook/react@934177598 )**: fix transposed escape functions ([#25534](facebook/react#25534)) //<Josh Story>// - **[d1ced9fd5](facebook/react@d1ced9fd5 )**: [Float] support all links as Resources ([#25515](facebook/react#25515)) //<Josh Story>// - **[973b90bdf](facebook/react@973b90bdf )**: [Float] support meta tags as Resources ([#25514](facebook/react#25514)) //<Josh Story>// - **[79c582981](facebook/react@79c582981 )**: Let ReactDOM initialize in RSC ([#25503](facebook/react#25503)) //<Sebastian Markbåge>// - **[1f7a2f577](facebook/react@1f7a2f577 )**: [Float] support title tags as Resources ([#25508](facebook/react#25508)) //<Josh Story>// - **[c63580787](facebook/react@c63580787 )**: Support `use` in `act` testing API ([#25523](facebook/react#25523)) //<Andrew Clark>// - **[65e32e58b](facebook/react@65e32e58b )**: Add fetch Instrumentation to Dedupe Fetches ([#25516](facebook/react#25516)) //<Sebastian Markbåge>// - **[9336e29d9](facebook/react@9336e29d9 )**: [useEvent] Lint for presence of useEvent functions in dependency lists ([#25512](facebook/react#25512)) //<lauren>// - **[3cc792bfb](facebook/react@3cc792bfb )**: [useEvent] Non-stable function identity ([#25473](facebook/react#25473)) //<lauren>// - **[987292815](facebook/react@987292815 )**: Remove feature flag enableStrictEffects ([#25387](facebook/react#25387)) //<Samuel Susla>// - **[8e2bde6f2](facebook/react@8e2bde6f2 )**: Add cache() API ([#25506](facebook/react#25506)) //<Sebastian Markbåge>// - **[9cdf8a99e](facebook/react@9cdf8a99e )**: [Codemod] Update copyright header to Meta ([#25315](facebook/react#25315)) //<Andrew Clark>// - **[e54015e26](facebook/react@e54015e26 )**: Refactor: fill in the flow missing type ([#25496](facebook/react#25496)) //<c0dedance>// - **[3b1fd5767](facebook/react@3b1fd5767 )**: refactor: Flow: typing of Scheduler ([#25485](facebook/react#25485)) //<bubucuo>// - **[14072ce64](facebook/react@14072ce64 )**: Add detach to Offscreen component ([#25265](facebook/react#25265)) //<Samuel Susla>// - **[3bb71dfd4](facebook/react@3bb71dfd4 )**: Rename react-server-dom-webpack entry points to /client and /server ([#25504](facebook/react#25504)) //<Sebastian Markbåge>// - **[71f2c8cf1](facebook/react@71f2c8cf1 )**: move resource acquisition to mutation phase ([#25500](facebook/react#25500)) //<Josh Story>// - **[500bea532](facebook/react@500bea532 )**: Add option to load Fizz runtime from external file ([#25499](facebook/react#25499)) //<Andrew Clark>// - **[4494f2a86](facebook/react@4494f2a86 )**: [Float] add support for scripts and other enhancements ([#25480](facebook/react#25480)) //<Josh Story>// - **[9ecf84ed7](facebook/react@9ecf84ed7 )**: Bugfix: Suspending in shell during discrete update ([#25495](facebook/react#25495)) //<Andrew Clark>// Changelog: [General][Changed] - React Native sync for revisions 54f297a...ab075a2 jest_e2e[run_all_tests] Reviewed By: kassens Differential Revision: D40897093 fbshipit-source-id: 6a040315834dea5c0ab994ea94d91f5605b9d6b0
GrinZero
added a commit
to GrinZero/react
that referenced
this pull request
Nov 7, 2022
* 'main' of ssh://github.com/GrinZero/react: (163 commits) Do not unmount layout effects if ancestor Offscreen is hidden (facebook#25628) Remove check in renderDidSuspendDelayIfPossible (facebook#25630) [ServerRenderer] Move fizz external runtime implementation to react-dom-bindings (facebook#25617) Unwrap sync resolved thenables without suspending (facebook#25615) refactor isHostResourceType to not receive the context from reconciler and not leak types (facebook#25610) Make host context use null as empty and only error in dev (facebook#25609) [Float] handle resource Resource creation inside svg context (facebook#25599) Allow uncached IO to stablize (facebook#25561) [ServerRenderer] Setup for adding data attributes streaming format (facebook#25567) Do not unmount layout effects on initial Offscreen mount (facebook#25592) Fix type check for null (facebook#25595) Clean up vestige of useOpaqueIdentifier (facebook#25587) Extract logic for detecting bad fallback to helper Split suspended work loop logic into separate functions In work loop, add enum of reasons for suspending Strict Mode: Reuse memoized result from first pass (facebook#25583) Detect and warn if use(promise) is wrapped with try/catch block (facebook#25543) Remove old react-fetch, react-fs and react-pg libraries (facebook#25577) Try assigning fetch to globalThis if global assignment fails (facebook#25571) [Float] handle noscript context for Resources (facebook#25559) ... # Conflicts: # scripts/rollup/build.js
rickhanlonii
pushed a commit
that referenced
this pull request
Dec 3, 2022
The old (unstable) mechanism for suspending was to throw a promise. The purpose of throwing is to interrupt the component's execution, and also to signal to React that the interruption was caused by Suspense as opposed to some other error. A flaw is that throwing is meant to be an implementation detail — if code in userspace catches the promise, it can lead to unexpected behavior. With `use`, userspace code does not throw promises directly, but `use` itself still needs to throw something to interrupt the component and unwind the stack. The solution is to throw an internal error. In development, we can detect whether the error was caught by a userspace try/catch block and log a warning — though it's not foolproof, since a clever user could catch the object and rethrow it later. The error message includes advice to move `use` outside of the try/catch block. I did not yet implement the warning in Flight.
acdlite
added a commit
to acdlite/react
that referenced
this pull request
Dec 5, 2022
…ck (facebook#25543)" This reverts commit d2a0176. The old (unstable) mechanism for suspending was to throw a promise. The purpose of throwing is to interrupt the component's execution, and also to signal to React that the interruption was caused by Suspense as opposed to some other error. A flaw is that throwing is meant to be an implementation detail — if code in userspace catches the promise, it can lead to unexpected behavior. With `use`, userspace code does not throw promises directly, but `use` itself still needs to throw something to interrupt the component and unwind the stack. The solution is to throw an internal error. In development, we can detect whether the error was caught by a userspace try/catch block and log a warning — though it's not foolproof, since a clever user could catch the object and rethrow it later. The error message includes advice to move `use` outside of the try/catch block. I did not yet implement the warning in Flight.
OlimpiaZurek
pushed a commit
to OlimpiaZurek/react-native
that referenced
this pull request
May 22, 2023
Summary: This sync includes the following changes: - **[ab075a232](facebook/react@ab075a232 )**: Do not unmount layout effects on initial Offscreen mount ([facebook#25592](facebook/react#25592)) //<Samuel Susla>// - **[765805bf8](facebook/react@765805bf8 )**: Fix type check for null ([facebook#25595](facebook/react#25595)) //<Sebastian Markbåge>// - **[2ac77aab9](facebook/react@2ac77aab9 )**: Clean up vestige of useOpaqueIdentifier ([facebook#25587](facebook/react#25587)) //<Andrew Clark>// - **[bdd3d0807](facebook/react@bdd3d0807 )**: Extract logic for detecting bad fallback to helper //<Andrew Clark>// - **[952dfff3f](facebook/react@952dfff3f )**: Split suspended work loop logic into separate functions //<Andrew Clark>// - **[d2c0ab10d](facebook/react@d2c0ab10d )**: In work loop, add enum of reasons for suspending //<Andrew Clark>// - **[5450dd409](facebook/react@5450dd409 )**: Strict Mode: Reuse memoized result from first pass ([facebook#25583](facebook/react#25583)) //<Andrew Clark>// - **[d2a0176a1](facebook/react@d2a0176a1 )**: Detect and warn if use(promise) is wrapped with try/catch block ([facebook#25543](facebook/react#25543)) //<Andrew Clark>// - **[cf3932be5](facebook/react@cf3932be5 )**: Remove old react-fetch, react-fs and react-pg libraries ([facebook#25577](facebook/react#25577)) //<Sebastian Markbåge>// - **[28a574ea8](facebook/react@28a574ea8 )**: Try assigning fetch to globalThis if global assignment fails ([facebook#25571](facebook/react#25571)) //<Sebastian Markbåge>// - **[09def5990](facebook/react@09def5990 )**: [Float] handle noscript context for Resources ([facebook#25559](facebook/react#25559)) //<Josh Story>// - **[17204056d](facebook/react@17204056d )**: [Float] fix coordination of resource identity and hydration ([facebook#25569](facebook/react#25569)) //<Josh Story>// - **[d925a8d0b](facebook/react@d925a8d0b )**: Flight client error stack ([facebook#25560](facebook/react#25560)) //<Josh Story>// - **[996b00b78](facebook/react@996b00b78 )**: [Tiny] Fixed incorrect import in `react-server-dom-webpack` ([facebook#25554](facebook/react#25554)) //<Leo Lamprecht>// - **[e7c5af45c](facebook/react@e7c5af45c )**: Update cache() and use() to the canary aka next channel ([facebook#25502](facebook/react#25502)) //<Sebastian Markbåge>// - **[fa77f52e7](facebook/react@fa77f52e7 )**: Unify promise switch statements //<Andrew Clark>// - **[7572e4931](facebook/react@7572e4931 )**: Track thenable state in work loop //<Andrew Clark>// - **[7fc3eefd8](facebook/react@7fc3eefd8 )**: Revert yieldy behavior for non-use Suspense (in Flight, too) //<Andrew Clark>// - **[61f9b5e97](facebook/react@61f9b5e97 )**: [Float] support <base> as Resource ([facebook#25546](facebook/react#25546)) //<Josh Story>// - **[1d3fc9c9c](facebook/react@1d3fc9c9c )**: Bug fix when resolving cache ([facebook#25545](facebook/react#25545)) //<Sebastian Markbåge>// - **[cce18e350](facebook/react@cce18e350 )**: [Flight] Use AsyncLocalStorage to extend the scope of the cache to micro tasks ([facebook#25542](facebook/react#25542)) //<Sebastian Markbåge>// - **[caa84c8da](facebook/react@caa84c8da )**: Revert fetch instrumentation to only RSC ([facebook#25540](facebook/react#25540)) //<Sebastian Markbåge>// - **[0c11baa6a](facebook/react@0c11baa6a )**: add warnings for non-resources rendered outside body or head ([facebook#25532](facebook/react#25532)) //<Josh Story>// - **[9236abdb5](facebook/react@9236abdb5 )**: when float is enabled only push title and script as a single unit ([facebook#25536](facebook/react#25536)) //<Josh Story>// - **[dd5c20825](facebook/react@dd5c20825 )**: Revert yieldy behavior for non-use Suspense ([facebook#25537](facebook/react#25537)) //<Andrew Clark>// - **[934177598](facebook/react@934177598 )**: fix transposed escape functions ([facebook#25534](facebook/react#25534)) //<Josh Story>// - **[d1ced9fd5](facebook/react@d1ced9fd5 )**: [Float] support all links as Resources ([facebook#25515](facebook/react#25515)) //<Josh Story>// - **[973b90bdf](facebook/react@973b90bdf )**: [Float] support meta tags as Resources ([facebook#25514](facebook/react#25514)) //<Josh Story>// - **[79c582981](facebook/react@79c582981 )**: Let ReactDOM initialize in RSC ([facebook#25503](facebook/react#25503)) //<Sebastian Markbåge>// - **[1f7a2f577](facebook/react@1f7a2f577 )**: [Float] support title tags as Resources ([facebook#25508](facebook/react#25508)) //<Josh Story>// - **[c63580787](facebook/react@c63580787 )**: Support `use` in `act` testing API ([facebook#25523](facebook/react#25523)) //<Andrew Clark>// - **[65e32e58b](facebook/react@65e32e58b )**: Add fetch Instrumentation to Dedupe Fetches ([facebook#25516](facebook/react#25516)) //<Sebastian Markbåge>// - **[9336e29d9](facebook/react@9336e29d9 )**: [useEvent] Lint for presence of useEvent functions in dependency lists ([facebook#25512](facebook/react#25512)) //<lauren>// - **[3cc792bfb](facebook/react@3cc792bfb )**: [useEvent] Non-stable function identity ([facebook#25473](facebook/react#25473)) //<lauren>// - **[987292815](facebook/react@987292815 )**: Remove feature flag enableStrictEffects ([facebook#25387](facebook/react#25387)) //<Samuel Susla>// - **[8e2bde6f2](facebook/react@8e2bde6f2 )**: Add cache() API ([facebook#25506](facebook/react#25506)) //<Sebastian Markbåge>// - **[9cdf8a99e](facebook/react@9cdf8a99e )**: [Codemod] Update copyright header to Meta ([facebook#25315](facebook/react#25315)) //<Andrew Clark>// - **[e54015e26](facebook/react@e54015e26 )**: Refactor: fill in the flow missing type ([facebook#25496](facebook/react#25496)) //<c0dedance>// - **[3b1fd5767](facebook/react@3b1fd5767 )**: refactor: Flow: typing of Scheduler ([facebook#25485](facebook/react#25485)) //<bubucuo>// - **[14072ce64](facebook/react@14072ce64 )**: Add detach to Offscreen component ([facebook#25265](facebook/react#25265)) //<Samuel Susla>// - **[3bb71dfd4](facebook/react@3bb71dfd4 )**: Rename react-server-dom-webpack entry points to /client and /server ([facebook#25504](facebook/react#25504)) //<Sebastian Markbåge>// - **[71f2c8cf1](facebook/react@71f2c8cf1 )**: move resource acquisition to mutation phase ([facebook#25500](facebook/react#25500)) //<Josh Story>// - **[500bea532](facebook/react@500bea532 )**: Add option to load Fizz runtime from external file ([facebook#25499](facebook/react#25499)) //<Andrew Clark>// - **[4494f2a86](facebook/react@4494f2a86 )**: [Float] add support for scripts and other enhancements ([facebook#25480](facebook/react#25480)) //<Josh Story>// - **[9ecf84ed7](facebook/react@9ecf84ed7 )**: Bugfix: Suspending in shell during discrete update ([facebook#25495](facebook/react#25495)) //<Andrew Clark>// Changelog: [General][Changed] - React Native sync for revisions 54f297a...ab075a2 jest_e2e[run_all_tests] Reviewed By: kassens Differential Revision: D40897093 fbshipit-source-id: 6a040315834dea5c0ab994ea94d91f5605b9d6b0
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
The old (unstable) mechanism for suspending was to throw a promise. The purpose of throwing is to interrupt the component's execution, and also to signal to React that the interruption was caused by Suspense as opposed to some other error.
A flaw is that throwing is meant to be an implementation detail — if code in userspace catches the promise, it can lead to unexpected behavior.
With
use, userspace code does not throw promises directly, butuseitself still needs to throw something to interrupt the component and unwind the stack.The solution is to throw an internal error. In development, we can detect whether the error was caught by a userspace try/catch block and log a warning — though it's not foolproof, since a clever user could catch the object and rethrow it later.
The error message includes advice to move
useoutside of the try/catch block.I did not yet implement the warning in Flight.