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Modify React DevTools for Replay integration - #2
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…bundle size (#26122) <!-- Thanks for submitting a pull request! We appreciate you spending the time to work on these changes. Please provide enough information so that others can review your pull request. The three fields below are mandatory. Before submitting a pull request, please make sure the following is done: 1. Fork [the repository](https://github.com/facebook/react) and create your branch from `main`. 2. Run `yarn` in the repository root. 3. If you've fixed a bug or added code that should be tested, add tests! 4. Ensure the test suite passes (`yarn test`). Tip: `yarn test --watch TestName` is helpful in development. 5. Run `yarn test --prod` to test in the production environment. It supports the same options as `yarn test`. 6. If you need a debugger, run `yarn debug-test --watch TestName`, open `chrome://inspect`, and press "Inspect". 7. Format your code with [prettier](https://github.com/prettier/prettier) (`yarn prettier`). 8. Make sure your code lints (`yarn lint`). Tip: `yarn linc` to only check changed files. 9. Run the [Flow](https://flowtype.org/) type checks (`yarn flow`). 10. If you haven't already, complete the CLA. Learn more about contributing: https://reactjs.org/docs/how-to-contribute.html --> ## Summary This PR: - Replaces the existing usages of methods from the `semver` library in the React DevTools source with an inlined version based on https://www.npmjs.com/package/semver-compare. This appears to drop the unminified bundle sizes of 3 separate `react-devtools-extensions` build artifacts by about 50K:  ## How did you test this change? I was originally working on [a fork of React DevTools](replayio#2) for use with https://replay.io , specifically our integration of the React DevTools UI to show the React component tree while users are debugging a recorded application. As part of the dev work on that fork, I wanted to shrink the bundle size of the extension's generated JS build artifacts. I noted that the official NPM `semver` library was taking up a noticeable chunk of space in the bundles, and saw that it's only being used in a handful of places to do some very simple version string comparisons. I was able to replace the `semver` imports and usages with a simple alternate comparison function, and confirmed via hands-on checks and console logging that the checks behaved the same way. Given that, I wanted to upstream this particular change to help shrink the real extension's bundle sizes. I know that it's an extension, so bundle size isn't _as_ critical a concern as it would be for a pure library. But, smaller download sizes do benefit all users, and that also includes sites like CodeSandbox and Replay that are using the React DevTools as a library as well. I'm happy to tweak this PR if necessary. Thanks!
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…bundle size (#26122) <!-- Thanks for submitting a pull request! We appreciate you spending the time to work on these changes. Please provide enough information so that others can review your pull request. The three fields below are mandatory. Before submitting a pull request, please make sure the following is done: 1. Fork [the repository](https://github.com/facebook/react) and create your branch from `main`. 2. Run `yarn` in the repository root. 3. If you've fixed a bug or added code that should be tested, add tests! 4. Ensure the test suite passes (`yarn test`). Tip: `yarn test --watch TestName` is helpful in development. 5. Run `yarn test --prod` to test in the production environment. It supports the same options as `yarn test`. 6. If you need a debugger, run `yarn debug-test --watch TestName`, open `chrome://inspect`, and press "Inspect". 7. Format your code with [prettier](https://github.com/prettier/prettier) (`yarn prettier`). 8. Make sure your code lints (`yarn lint`). Tip: `yarn linc` to only check changed files. 9. Run the [Flow](https://flowtype.org/) type checks (`yarn flow`). 10. If you haven't already, complete the CLA. Learn more about contributing: https://reactjs.org/docs/how-to-contribute.html --> ## Summary This PR: - Replaces the existing usages of methods from the `semver` library in the React DevTools source with an inlined version based on https://www.npmjs.com/package/semver-compare. This appears to drop the unminified bundle sizes of 3 separate `react-devtools-extensions` build artifacts by about 50K:  ## How did you test this change? I was originally working on [a fork of React DevTools](replayio#2) for use with https://replay.io , specifically our integration of the React DevTools UI to show the React component tree while users are debugging a recorded application. As part of the dev work on that fork, I wanted to shrink the bundle size of the extension's generated JS build artifacts. I noted that the official NPM `semver` library was taking up a noticeable chunk of space in the bundles, and saw that it's only being used in a handful of places to do some very simple version string comparisons. I was able to replace the `semver` imports and usages with a simple alternate comparison function, and confirmed via hands-on checks and console logging that the checks behaved the same way. Given that, I wanted to upstream this particular change to help shrink the real extension's bundle sizes. I know that it's an extension, so bundle size isn't _as_ critical a concern as it would be for a pure library. But, smaller download sizes do benefit all users, and that also includes sites like CodeSandbox and Replay that are using the React DevTools as a library as well. I'm happy to tweak this PR if necessary. Thanks! DiffTrain build for [78d2e9e](78d2e9e) [View git log for this commit](https://github.com/facebook/react/commits/78d2e9e2a894a7ea9aa3f9faadfc4c6038e86a75)
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…bundle size (#26122) <!-- Thanks for submitting a pull request! We appreciate you spending the time to work on these changes. Please provide enough information so that others can review your pull request. The three fields below are mandatory. Before submitting a pull request, please make sure the following is done: 1. Fork [the repository](https://github.com/facebook/react) and create your branch from `main`. 2. Run `yarn` in the repository root. 3. If you've fixed a bug or added code that should be tested, add tests! 4. Ensure the test suite passes (`yarn test`). Tip: `yarn test --watch TestName` is helpful in development. 5. Run `yarn test --prod` to test in the production environment. It supports the same options as `yarn test`. 6. If you need a debugger, run `yarn debug-test --watch TestName`, open `chrome://inspect`, and press "Inspect". 7. Format your code with [prettier](https://github.com/prettier/prettier) (`yarn prettier`). 8. Make sure your code lints (`yarn lint`). Tip: `yarn linc` to only check changed files. 9. Run the [Flow](https://flowtype.org/) type checks (`yarn flow`). 10. If you haven't already, complete the CLA. Learn more about contributing: https://reactjs.org/docs/how-to-contribute.html --> ## Summary This PR: - Replaces the existing usages of methods from the `semver` library in the React DevTools source with an inlined version based on https://www.npmjs.com/package/semver-compare. This appears to drop the unminified bundle sizes of 3 separate `react-devtools-extensions` build artifacts by about 50K:  ## How did you test this change? I was originally working on [a fork of React DevTools](replayio/react#2) for use with https://replay.io , specifically our integration of the React DevTools UI to show the React component tree while users are debugging a recorded application. As part of the dev work on that fork, I wanted to shrink the bundle size of the extension's generated JS build artifacts. I noted that the official NPM `semver` library was taking up a noticeable chunk of space in the bundles, and saw that it's only being used in a handful of places to do some very simple version string comparisons. I was able to replace the `semver` imports and usages with a simple alternate comparison function, and confirmed via hands-on checks and console logging that the checks behaved the same way. Given that, I wanted to upstream this particular change to help shrink the real extension's bundle sizes. I know that it's an extension, so bundle size isn't _as_ critical a concern as it would be for a pure library. But, smaller download sizes do benefit all users, and that also includes sites like CodeSandbox and Replay that are using the React DevTools as a library as well. I'm happy to tweak this PR if necessary. Thanks! DiffTrain build for [78d2e9e2a894a7ea9aa3f9faadfc4c6038e86a75](react/react@78d2e9e) [View git log for this commit](https://github.com/facebook/react/commits/78d2e9e2a894a7ea9aa3f9faadfc4c6038e86a75)
Move useMemoCache hook to react/compiler-runtime For Meta-internal purposes, we keep the export on `react` itself to reduce churn.
Enables the Reanimated flag automatically if we find reanimated in the user's list of plugins ghstack-source-id: 20e83374612362a30d6c8cc7a903d9320e8cc23a Pull Request resolved: https://github.com/facebook/react-forget/pull/2915
ghstack-source-id: 79f3319d87909d05731ef821d0ffe86cb01b0432 Pull Request resolved: https://github.com/facebook/react-forget/pull/2920
Show compiling status message and not just block UI. ghstack-source-id: 67761c5d32216e105c4aa6404dfa07d76ae22583 Pull Request resolved: https://github.com/facebook/react-forget/pull/2921
ghstack-source-id: f05222073be785b77346c4e8760bf4d0bb4d658e Pull Request resolved: https://github.com/facebook/react-forget/pull/2922
Add a configurable list of known incompatible libraries. Check all package.jsons for any uses of known incompatible libraries and warn if found. ghstack-source-id: 7329e3792b57458e681780cba3140a14a9b1a60d Pull Request resolved: https://github.com/facebook/react-forget/pull/2923
Makes it easier to extend later, if we want to add more checks. ghstack-source-id: 6fb3435555f1b988e1a185bfda8be9418eb622c5 Pull Request resolved: https://github.com/facebook/react-forget/pull/2924
Treat MethodCalls similar to general CallExpressions and mark them as escaping in PruneNonEscapingScopes pass. ghstack-source-id: 3c81bdb17f58fbeef8be24e7cb363172d1867217 Pull Request resolved: https://github.com/facebook/react-forget/pull/2925
…#2918) This uses the compiler runtime from `react/compiler-runtime` by default unless `compilerRuntime` is specifified in the Babel options which then imports the runtime from there. The `useMemoCache` hook is now named `c` in accordance with react@4508873 Unfortunately, I couldn't figure out how to import `react@beta` which already has that import as various react verstions were conflicting. If someone can figure this out it'd be fantastic. As a result, I had to update the default for the test runner to default the `compilerRuntime` option to `react` to preserve the previous behavior to import from `react`. Once upgraded to React 19, we should be able to remove that override.
To make a first time setup of the compiler truly config-less, default to not compiling node_modules unless a user provided `sources` (advanced option) is provided ghstack-source-id: b0798052404d772ce6ee471e577699d4b0871d56 Pull Request resolved: https://github.com/facebook/react-forget/pull/2919
When a React PR is opened CI will report large size changes. But for critical packages like react-dom it reports always. In React 19 we moved the build for react-dom the client reconciler from react-dom to react-dom/client This change adds react-dom-client artifacts for stable and oss channels since that is originally what was being tracked. But since react-dom/client always imports react-dom I left the original react-dom packages as critical as well. They are small but it would be good to keep an eye on them
## Summary This PR introduces a faster version of the `addProperties` function. This new function is basically the `diffProperties` with `prevProps` set to `null`, propagated constants, and all the unreachable code paths collapsed. ## How did you test this change? I've tested this change with [the benchmark app](https://github.com/react-native-community/RNNewArchitectureApp/tree/new-architecture-benchmarks) and got ~4.4% improvement in the view creation time.
…ontext in React 17 (react#28974)
ghstack-source-id: bb66913e2d3c814696311371ed655f3da03d1199 Pull Request resolved: facebook/react-forget#2926
ghstack-source-id: cce73f26b7b3903b8d79b70dbc24cbee09693d81 Pull Request resolved: facebook/react-forget#2927
Summary: jmbrown215 recently had an observation that the arguments to useState/useRef are only used when a component renders for the first time, and never afterwards. We can skip more computation that we previously could, with reactive blocks that previously recomputed values when inputs changed now only ever computing them on the first render. ghstack-source-id: 5d044ef Pull Request resolved: react#29653
Summary: This PR expands the analysis from the previous in the stack in order to also capture when a value can incorrectly change within a single render, rather than just changing between two renders. In the case where dependencies have changed and so a new value is being computed, we now compute the value twice and compare the results. This would, for example, catch when we call Math.random() in render. The generated code is a little convoluted, because we don't want to have to traverse the generated code and substitute variable names with new ones. Instead, we save the initial value to the cache as normal, then run the computation block again and compare the resulting values to the cached ones. Then, to make sure that the cached values are identical to the computed ones, we reassign the cached values into the output variables. ghstack-source-id: d0f11a4 Pull Request resolved: react#29657
…ive scopes for debugging Summary: Using the change detection code to debug codebases that violate the rules of react is a lot easier when we have a source location corresponding to the value that has changed inappropriately. I didn't see an easy way to track that information in the existing data structures at the point of codegen, so this PR adds locations to identifiers and reactive scopes (the location of a reactive scope is the range of the locations of its included identifiers). I'm interested if there's a better way to do this that I missed! ghstack-source-id: aed5f7e Pull Request resolved: react#29658
…9670) When a component suspends with `use`, we switch to the "re-render" dispatcher during the subsequent render attempt, so that we can reuse the work from the initial attempt. However, once we run out of hooks from the previous attempt, we should switch back to the regular "update" dispatcher. This is conceptually the same fix as the one introduced in react#26232. That fix only accounted for initial mount, but the useTransition regression test added in f829733 illustrates that we need to handle updates, too. The issue affects more than just useTransition but because most of the behavior between the "re-render" and "update" dispatchers is the same it's hard to contrive other scenarios in a test, which is probably why it took so long for someone to notice. Closesreact#28923 and react#29209 --------- Co-authored-by: eps1lon <sebastian.silbermann@vercel.com>
Eslint rules should never throw, so if we fail to parse with Babel or Hermes, we should just ignore the error. This should fix issues such as trying to run the eslint rule on non tsx|ts|jsx|js files, Hermes parser not supporting certain JS syntax, etc. I didn't add a test for this as our eslint-rule-tester config uses hermes-eslint parser, so it wasn't possible to add a top level await as it would crash hermes-eslint before our rule was triggered. Similarly I couldn't add a test for non-JS files as it would not be parseable by hermes-eslint. Fixesreact#29107 ghstack-source-id: 60afcdb Pull Request resolved: react#29631
…ce maps from (react#29708) This lets you click a stack frame on the client and see the Server source code inline. <img width="871" alt="Screenshot 2024-06-01 at 11 44 24 PM" src="https://github.com/facebook/react/assets/63648/581281ce-0dce-40c0-a084-4a6d53ba1682"> <img width="840" alt="Screenshot 2024-06-01 at 11 43 37 PM" src="https://github.com/facebook/react/assets/63648/00dc77af-07c1-4389-9ae0-cf1f45199efb"> We could do some logic on the server that sends a source map url for every stack frame in the RSC payload. That would make the client potentially config free. However regardless we need the config to describe what url scheme to use since that’s not built in to the bundler config. In practice you likely have a common pattern for your source maps so no need to send data over and over when we can just have a simple function configured on the client. The server must return a source map, even if the file is not actually compiled since the fake file is still compiled. The source mapping strategy can be one of two models depending on if the server’s stack traces (`new Error().stack`) are source mapped back to the original (`—enable-source-maps`) or represents the location in compiled code (like in the browser). If it represents the location in compiled code it’s actually easier. You just serve the source map generated for that file by the tooling. If it is already source mapped it has to generate a source map where everything points to the same location (as if not compiled) ideally with a segment per logical ast node.
Requires react#29706 The strategy here is to: - Checkout the builds/facebook-www branch - Read the current sync'd VERSION - Checkout out main and sync new build - sed/{new version string}/{old version string} - Run git status, skip sync if clean - Otherwise, sed/{old version string}/{new version string} and push commit This means that: - We're using the real version strings from the builds - We are checking the last commit on the branch for the real last version - We're skipping any commits that won't result in changes - ??? - Profit!
Host Components can exist as four semantic types 1. regular Components (Vanilla obv) 2. singleton Components 2. hoistable components 3. resources Each of these component types have their own rules related to mounting and reconciliation however they are not direclty modeled as their own unique fiber type. This is partly for code size but also because reconciling the inner type of these components would be in a very hot path in fiber creation and reconciliation and it's just not practical to do this logic check here. Right now we have three Fiber types used to implement these 4 concepts but we probably need to reconsider the model and think of Host Components as a single fiber type with an inner implementation. Once we do this we can regularize things like transitioning between a resource and a regular component or a singleton and a hoistable instance. The cases where these transitions happen today aren't particularly common but they can be observed and currently the handling of these transitions is incomplete at best and buggy at worst. The most egregious case is the link type. This can be a regular component (stylesheet without precedence) a hoistable component (non stylesheet link tags) or a resource (stylesheet with a precedence) and if you have a single jsx slot that tries to reconcile transitions between these types it just doesn't work well. This commit adds an error for when a Hoistable goes from Instance to Resource. Currently this is only possible for `<link>` elements going to and from stylesheets with precedence. Hopefully we'll be able to remove this error and implement as an inner type before we encounter new categories for the Hoistable types detecting type shifting to and from regular components is harder to do efficiently because we don't want to reevaluate the type on every update for host components which is currently not required and would add overhead to a very hot path singletons can't really type shift in their one practical implementation (DOM) so they are only a problem in theroy not practice
stylehsheet -> stylesheet
Mini-refactor of useActionState to only wrap the action in a transition context if the dispatch is called during a transition. Conceptually, the action starts as soon as the dispatch is called, even if the action is queued until earlier ones finish. We will also warn if an async action is dispatched outside of a transition, since that is almost certainly a mistake. Ideally we would automatically upgrade these to a transition, but we don't have a great way to tell if the action is async until after it's already run.
Based on - react#29694 --- If an action in the useActionState queue errors, we shouldn't run any subsequent actions. The contract of useActionState is that the actions run in sequence, and that one action can assume that all previous actions have completed successfully. For example, in a shopping cart UI, you might dispatch an "Add to cart" action followed by a "Checkout" action. If the "Add to cart" action errors, the "Checkout" action should not run. An implication of this change is that once useActionState falls into an error state, the only way to recover is to reset the component tree, i.e. by unmounting and remounting. The way to customize the error handling behavior is to wrap the action body in a try/catch.
RC releases are a special kind of prerelease build because unlike
canaries we shouldn't publish new RCs from any commit on `main`, only
when we intentionally bump the RC number. But they are still prerelases
— like canary and experimental releases, they should use exact version
numbers in their dependencies (no ^).
We only need to generate these builds during the RC phase, i.e. when the
canary channel label is set to "rc".
Example of resulting package.json output:
```json
{
"name": "react-dom",
"version": "19.0.0-rc.0",
"dependencies": {
"scheduler": "0.25.0-rc.0"
},
"peerDependencies": {
"react": "19.0.0-rc.0"
}
}
```
https://react-builds.vercel.app/prs/29736/files/oss-stable-rc/react-dom/package.jsonreact#29697) This information is available in the regular stack but since that's hidden behind an expando and our appended stack to logs is not hidden, it hides the most important frames like the name of the current component. This is closer to what happens to the native stack. We only include stacks if they're within a ReactFiberCallUserSpace call frame. This should be most that have a current fiber but this is critical to filtering out most React frames if the regular node_modules filter doesn't work. Most React warnings fire during the rendering phase and not inside a user space function but some do like hooks warnings and setState in render. This feature is more important if we port this to React DevTools appending stacks to all logs where it's likely to originate from inside a component and you want the line within that component to immediately part of the visible stack. One thing that kind sucks is that we don't have a reliable way to exclude React internal stack frames. We filter node_modules but it might not match. For other cases I try hard to only track the stack frame at the root of React (e.g. immediately inside createElement) until the ReactFiberCallUserSpace so we don't need the filtering to work. In this case it's hard to achieve the same thing though. This is easier in RDT because we have the start/end line and parsing of stack traces so we can use that to exclude internals but that's a lot of code/complexity for shipping within the library. For example in Safari: <img width="590" alt="Screenshot 2024-05-31 at 6 15 27 PM" src="https://github.com/facebook/react/assets/63648/2820c8c0-8a03-42e9-8678-8348f66b051a"> Ideally warnOnUseFormStateInDev and useFormState wouldn't be included since they're React internals. Before this change, the Counter.js line also wasn't included though which points to exactly where the error is within the user code. (Note Server Components have V8 formatted lines and Client Components have JSC formatted lines.)
Use some clever git diffing to ignore lines that only change the `@generated` header. We can't do this for the version string because the version string can be embedded in lines with other changes, but this header is always on one line.
ghstack-source-id: eedd024 Pull Request resolved: react#29742
…ed (react#29720) Following the instructions in the compiler/docs/DEVELOPMENT_GUIDE.md, we are stuck on the command `yarn snap --watch` because it calls readTestFilter even though the filter option is not enabled.
www: set enableRefAsProp to true
… of react (react#29753) <!-- Thanks for submitting a pull request! We appreciate you spending the time to work on these changes. Please provide enough information so that others can review your pull request. The three fields below are mandatory. Before submitting a pull request, please make sure the following is done: 1. Fork [the repository](https://github.com/facebook/react) and create your branch from `main`. 2. Run `yarn` in the repository root. 3. If you've fixed a bug or added code that should be tested, add tests! 4. Ensure the test suite passes (`yarn test`). Tip: `yarn test --watch TestName` is helpful in development. 5. Run `yarn test --prod` to test in the production environment. It supports the same options as `yarn test`. 6. If you need a debugger, run `yarn test --debug --watch TestName`, open `chrome://inspect`, and press "Inspect". 7. Format your code with [prettier](https://github.com/prettier/prettier) (`yarn prettier`). 8. Make sure your code lints (`yarn lint`). Tip: `yarn linc` to only check changed files. 9. Run the [Flow](https://flowtype.org/) type checks (`yarn flow`). 10. If you haven't already, complete the CLA. Learn more about contributing: https://reactjs.org/docs/how-to-contribute.html --> ## Summary Remove `startTransition` and `useActionState` from `react-server` condition of react, as they should only stay in client bundle. This will reduce the server bundle of react itself. Found this while tracing where the `process.emit` was called. <!-- Explain the **motivation** for making this change. What existing problem does the pull request solve? --> ## How did you test this change? <!-- Demonstrate the code is solid. Example: The exact commands you ran and their output, screenshots / videos if the pull request changes the user interface. How exactly did you verify that your PR solves the issue you wanted to solve? If you leave this empty, your PR will very likely be closed. -->
## Overview We didn't have any tests that ran in persistent mode with the xplat feature flags (for either variant). As a result, invalid test gating like in react#29664 were not caught. This PR adds test flavors for `ReactFeatureFlag-native-fb.js` in both variants.
Update RDT fork to support React 19
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This is a draft PR for visibility.
When I implemented our Chromium support for React DevTools via backend "routines" (as described in https://blog.replay.io/how-we-rebuilt-react-devtools-with-replay-routines ), I forked the React DevTools to make a number of internal changes, such as saving operations data separately and persisting "marker" annotations to Replay's backend.
Along the way I also tried to shrink down the size of the JS bundle artifacts that we were evaluating in our backend paused browser instances. They were originally around 500K+, and I was able to knock off about 60-70K of that by removing code that's irrelevant for our use case.