Generate sourcemaps for production build artifacts #26446
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And this PR is now green! It still needs an actual review, and also to rebased after the Rollup v3 PR is merged, but the sourcemaps work and CI is passing. |
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Note that this PR will supercede and invalidate past work on this such as: |
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Will this PR also help with sourcemaps in debug builds? In the past, debugging into React source code with the VS Code debugger has been a challenge, I assume because sourcemaps were not aligned with the actual sources. |
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@justingrant : no , I'm not trying to generate sourcemaps for dev build artifacts, because those should already be readable. Do you have an example where debugging a React dev build isn't working well? |
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@markerikson - my experience is pretty dated from a few years ago, and was largely focused on create-react-app which handled sourcemap creation in its webpack config. Things might have improved since then. But I do remember that debugging into debug React builds seldom/never aligned with the source. If you believe it's working now, then I'm inclined to trust your judgment and assume that the problems I was seeing were caused by CRA not React's debug sourcemaps. @jasonwilliams was also looking into this so he may have more info. |
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@gaearon you mentioned on Twitter that "the license stuff is complicated". Any specific concerns there, or other feedback on the PR? |
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Yes. I don't fully understand what's going on there. One option is that I need to dive into this. Another is that I can pose a constraint from my perspective. This constraint is: can we reduce any manual string manipulation in this PR? Ideally there would be none. What would the approach look like if we did not have any string manipulation code? If it's due to license headers, can we inject them at a different stage (e.g. earlier), or inject them in a way that automatically adjusts the sourcemaps? What is the sequence of problems that make this code necessary? |
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There's a couple pieces here. Rollup's own sourcemap handling normally produces a sourcemap where the "original" code is "the individual original source files", such as Because of that, what we we really want is to have a sourcemap where the "original" code is actually "the bundle contents right before Closure minified it" - in other words, the code that actually executed in the user's app. In order to make this happen, I skipped Rollup's sourcemap handling, and had Closure write a sourcemap for its minification step to disk. That contains 95% of the actual sourcemap content that we need. However, there's one more step in the Rollup pipeline after Closure. Because of that, the sourcemap from the Closure step is no longer accurate. If a particular mapping instruction pointed to a specific line segment in the output, the addition of the license text + wrapper before that in the final output throws off all the mappings. In order to align things correctly, we have to generate a sourcemap for the "possibly minified bundle -> bundle with license wrapper" step, and merge that with the "pre-minified bundle -> post-minified bundle" step. The best option I could come up with for doing that was to take the output of the license step, split it using the code to get the pieces that were added before and after, and re-run that step with a sourcemap-aware tool (the same It's maybe possible that we could move the license step before the Closure step, but I suspect that Closure would immediately strip off the license headers because those are comments. Don't know if there's somehow a Closure option that would allow us to preserve the headers. Also not sure what effect that would have on the rest of the module wrapping code that I also played with using With this approach, the bulk of the sourcemap work is in the one custom Rollup plugin there after the license plugin, and almost all the code changes are inside |
@markerikson @gaearon @jasonwilliams For historical purposes, this was also an approach I explored back in July 2022 when I was looking into fixing the things required to get sourcemap support added. From a quick search, this seems to be (at least one of the) places where I was looking at the license wrapper code, and proposed using
It includes a bit of a code exploration, some exploration of related libraries, and some proposals/diffs of how it could be used within the existing wrapper code in a 'minimally different'/low touch way, that should be simple to maintain, etc. |
0xdevalias
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0xdevalias
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Huh. I just tried reordering the Rollup plugins so that the license step does go before Closure and it skips the string manipulation step... and I think it's working the same way? I did a very brief search last night and think I found an indication that Closure might preserve comments with I need to do some more investigation here, but this seems promising at first glance. |
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Adding the license + wrappers before the Closure step seems to work. I did have to add an extra That removes the need for the string manipulation and the extra sourcemap merging step. The sourcemaps themselves still appear to be fully accurate. Some of the RN dev bundles have increased in size, but that appears to be due to them getting formatted by Prettier more so than they were previously (function call args getting split across multiple lines, etc). No actual content changes that I can see. |
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@gaearon I think this looks pretty good! Please look it over when you get a chance and let me know if you have further feedback! |
gaearon
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scripts/rollup/build.js
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| // Any other packages that should specifically _not_ have sourcemaps | ||
| const sourcemapPackageExcludes = [ | ||
| // Having `//#sourceMappingUrl` in this file breaks `ReactDevToolsHooksIntegration-test.js`, |
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Why? Can we fix the test to be more resilient instead?
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Not sure. It took me close to an hour just to figure out that having a sourcemap URL added to that bundle file was even the reason why that test was failing, and I have no idea why that was the case. Seemed to be something about imports or source parsing, maybe.
Per the comment, that file really doesn't need to have sourcemaps anyway, so it's reasonable to exclude it.
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I appreciate the time spent on this, but we generally try to understand each problem exhaustively before attempting a fix. In this case, it's important to understand why the test fails. Especially since the test has something to do with DevTools integration (which relies on parsing stacks), and might be flagging a real problem.
Even if it's not a real problem, imagine someone adding another package with similar logic, and then being confused why this logic doesn't fail tests when it's inside react-debug-tools, but does elsewhere. Then they would have to spend an hour only to find that react-debug-tools is somehow exceptional.
We do need to get to the bottom of the real cause.
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Okay, I'll dig into this further and see if I can understand what's going on.
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isStateEditable is calculated here so you might want to check if the primitive value is affected by the presence of sourcemaps. Maybe something gets borked in the stack parsing logic.
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Did some further poking at this. I think this is due to the react-debug-tools logic combined with the actual test setup in the first place.
The stack trace string, prior to being parsed, is:
Error:
at Object.apply (/home/acemarke/projects/react/scripts/jest/setupTests.js:219:29)
at Proxy.Error (/home/acemarke/projects/react/build/oss-stable/react-debug-tools/cjs/react-debug-tools.production.min.js:122:21)
at Object.useReducer (/home/acemarke/projects/react/build/oss-stable/react/cjs/react.production.min.js:959:21)
at MyComponent (/home/acemarke/projects/react/packages/react-debug-tools/src/__tests__/ReactDevToolsHooksIntegration-test.js:101:13)
at renderFunction (/home/acemarke/projects/react/build/oss-stable/react-debug-tools/cjs/react-debug-tools.production.min.js:652:5)
at Object.inspectHooks [as inspectHooksOfFiber] (/home/acemarke/projects/react/build/oss-stable/react-debug-tools/cjs/react-debug-tools.production.min.js:763:12)
at Object.<anonymous> (/home/acemarke/projects/react/packages/react-debug-tools/src/__tests__/ReactDevToolsHooksIntegration-test.js:118:32)
Note that Proxy.Error is already in the stack trace string.
react-debug-tools.production.min.js:122 is:
useInsertionEffect: function(a) {
C();
x.push({
primitive: "InsertionEffect",
stackError: Error(),
value: a
})
},Note the line stackError: Error(), and .stackError is what's getting passed to the error-stack-parser library.
If you look at scripts/jest/setupTests.js, it has this logic that overwrites global.Error with a proxy:
const ErrorProxy = new Proxy(OriginalError, {
apply(target, thisArg, argumentsList) {
const error = Reflect.apply(target, thisArg, argumentsList);
error.message = decodeErrorMessage(error.message);
return proxyErrorInstance(error);
},
construct(target, argumentsList, newTarget) {
const error = Reflect.construct(target, argumentsList, newTarget);
error.message = decodeErrorMessage(error.message);
return proxyErrorInstance(error);
},
get(target, key, receiver) {
if (key === 'captureStackTrace') {
return captureStackTrace;
}
return Reflect.get(target, key, receiver);
},
});
ErrorProxy.OriginalError = OriginalError;
global.Error = ErrorProxy;So, I think the inclusion of the sourcemap for react-debug-tools.production.min.js is causing Node to alter the stack trace related to that global.Error = ErrorProxy, which ends up breaking the parsing later.
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Sorry, I still don't quite understand. Where is the mistake? Which part is wrong here?
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@gaearon : there is no "mistake" per se.
The test setup code works as intended. The error stack parsing code works as intended.
But per my last comment, having a sourcemap for react-debug-tools.production.min.js causes Node to have different stack trace contents for the thrown error, which then causes the hook name parsing logic to fail to match what it expected to see.
We know this test worked fine when there was no sourcemap. It's an internal package, and there's no reason to have a sourcemap for this bundle.
So, we should skip it and keep the behavior the same as it was.
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We know this test worked fine when there was no sourcemap. It's an internal package, and there's no reason to have a sourcemap for this bundle.
Can confirm that this package is a part of React DevTools' backend, but for historical reasons (which I don't know) it is present as a separate package in this monorepo.
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Yeah, I did just actually happen to talk to Brian today about the fact that gets used as part of the RDT backend to parse hook names.
That said, while it's technically published ( https://www.npmjs.com/package/react-debug-tools ) , it doesn't look like it's even been published at all since the first release 5 years ago, and it seems like the only references are inside of the RDT internals. So, still no reason that I can see to justify having a sourcemap generated for that package, especially given the test situation.
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🥳 |
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Thanks again for working on this @markerikson! |
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Awesome! And thank you for helping push this across the finish line! |
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<!-- 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 This PR updates the Rollup build pipeline to generate sourcemaps for production build artifacts like `react-dom.production.min.js`. It requires the Rollup v3 changes that were just merged in #26442 . Sourcemaps are currently _only_ generated for build artifacts that are _truly_ "production" - no sourcemaps will be generated for development, profiling, UMD, or `shouldStayReadable` artifacts. The generated sourcemaps contain the bundled source contents right before that chunk was minified by Closure, and _not_ the original source files like `react-reconciler/src/*`. This better reflects the actual code that is running as part of the bundle, with all the feature flags and transformations that were applied to the source files to generate that bundle. The sourcemaps _do_ still show comments and original function names, thus improving debuggability for production usage. Fixes #20186 . <!-- Explain the **motivation** for making this change. What existing problem does the pull request solve? --> This allows React users to actually debug a readable version of the React bundle in production scenarios. It also allows other tools like [Replay](https://replay.io) to do a better job inspecting the React source when stepping through. ## How did you test this change? - Generated numerous sourcemaps with various combinations of the React bundle selections - Viewed those sourcemaps in https://evanw.github.io/source-map-visualization/ and confirmed via the visualization that the generated mappings appear to be correct I've attached a set of production files + their sourcemaps here: [react-sourcemap-examples.zip](https://github.com/facebook/react/files/11023466/react-sourcemap-examples.zip) You can drag JS+sourcemap file pairs into https://evanw.github.io/source-map-visualization/ for viewing. Examples: - `react.production.min.js`:  - `react-dom.production.min.js`:  - `use-sync-external-store/with-selector.production.min.js`:  <!-- 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. --> DiffTrain build for [2c8a139](2c8a139)
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wahooo 🥳 |
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Updated React from 2983249dd to 7508dcd5c. - facebook/react#27672 - facebook/react#27132 - facebook/react#27646 - facebook/react#26446
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In facebook#26446 we started publishing non-minified versions of our production build artifacts, along with source maps, for easier debugging of React when running in production mode. The way it's currently set up is that these builds are generated *before* Closure compiler has run. Which means it's missing many of the optimizations that are in the final build, like dead code elimination. This PR changes the build process to run Closure on the non-minified production builds, too, by moving the sourcemap generation to later in the pipeline. The non-minified builds will still preserve the original symbol names, and we'll use Prettier to add back whitespace. This is the exact same approach we've been using for years to generate production builds for Meta. The idea is that the only difference between the minified and non- minified builds is whitespace and symbol mangling. The semantic structure of the program should be identical. To implement this, I disabled symbol mangling when running Closure compiler. Then, in a later step, the symbols are mangled by Terser. This is when the source maps are generated.
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In facebook#26446 we started publishing non-minified versions of our production build artifacts, along with source maps, for easier debugging of React when running in production mode. The way it's currently set up is that these builds are generated *before* Closure compiler has run. Which means it's missing many of the optimizations that are in the final build, like dead code elimination. This PR changes the build process to run Closure on the non-minified production builds, too, by moving the sourcemap generation to later in the pipeline. The non-minified builds will still preserve the original symbol names, and we'll use Prettier to add back whitespace. This is the exact same approach we've been using for years to generate production builds for Meta. The idea is that the only difference between the minified and non- minified builds is whitespace and symbol mangling. The semantic structure of the program should be identical. To implement this, I disabled symbol mangling when running Closure compiler. Then, in a later step, the symbols are mangled by Terser. This is when the source maps are generated.
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In facebook#26446 we started publishing non-minified versions of our production build artifacts, along with source maps, for easier debugging of React when running in production mode. The way it's currently set up is that these builds are generated *before* Closure compiler has run. Which means it's missing many of the optimizations that are in the final build, like dead code elimination. This PR changes the build process to run Closure on the non-minified production builds, too, by moving the sourcemap generation to later in the pipeline. The non-minified builds will still preserve the original symbol names, and we'll use Prettier to add back whitespace. This is the exact same approach we've been using for years to generate production builds for Meta. The idea is that the only difference between the minified and non- minified builds is whitespace and symbol mangling. The semantic structure of the program should be identical. To implement this, I disabled symbol mangling when running Closure compiler. Then, in a later step, the symbols are mangled by Terser. This is when the source maps are generated.
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In facebook#26446 we started publishing non-minified versions of our production build artifacts, along with source maps, for easier debugging of React when running in production mode. The way it's currently set up is that these builds are generated *before* Closure compiler has run. Which means it's missing many of the optimizations that are in the final build, like dead code elimination. This PR changes the build process to run Closure on the non-minified production builds, too, by moving the sourcemap generation to later in the pipeline. The non-minified builds will still preserve the original symbol names, and we'll use Prettier to add back whitespace. This is the exact same approach we've been using for years to generate production builds for Meta. The idea is that the only difference between the minified and non- minified builds is whitespace and symbol mangling. The semantic structure of the program should be identical. To implement this, I disabled symbol mangling when running Closure compiler. Then, in a later step, the symbols are mangled by Terser. This is when the source maps are generated.
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<!-- 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 This PR updates the Rollup build pipeline to generate sourcemaps for production build artifacts like `react-dom.production.min.js`. It requires the Rollup v3 changes that were just merged in facebook#26442 . Sourcemaps are currently _only_ generated for build artifacts that are _truly_ "production" - no sourcemaps will be generated for development, profiling, UMD, or `shouldStayReadable` artifacts. The generated sourcemaps contain the bundled source contents right before that chunk was minified by Closure, and _not_ the original source files like `react-reconciler/src/*`. This better reflects the actual code that is running as part of the bundle, with all the feature flags and transformations that were applied to the source files to generate that bundle. The sourcemaps _do_ still show comments and original function names, thus improving debuggability for production usage. Fixes facebook#20186 . <!-- Explain the **motivation** for making this change. What existing problem does the pull request solve? --> This allows React users to actually debug a readable version of the React bundle in production scenarios. It also allows other tools like [Replay](https://replay.io) to do a better job inspecting the React source when stepping through. ## How did you test this change? - Generated numerous sourcemaps with various combinations of the React bundle selections - Viewed those sourcemaps in https://evanw.github.io/source-map-visualization/ and confirmed via the visualization that the generated mappings appear to be correct I've attached a set of production files + their sourcemaps here: [react-sourcemap-examples.zip](https://github.com/facebook/react/files/11023466/react-sourcemap-examples.zip) You can drag JS+sourcemap file pairs into https://evanw.github.io/source-map-visualization/ for viewing. Examples: - `react.production.min.js`:  - `react-dom.production.min.js`:  - `use-sync-external-store/with-selector.production.min.js`:  <!-- 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. -->
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In facebook#26446 we started publishing non-minified versions of our production build artifacts, along with source maps, for easier debugging of React when running in production mode. The way it's currently set up is that these builds are generated *before* Closure compiler has run. Which means it's missing many of the optimizations that are in the final build, like dead code elimination. This PR changes the build process to run Closure on the non-minified production builds, too, by moving the sourcemap generation to later in the pipeline. The non-minified builds will still preserve the original symbol names, and we'll use Prettier to add back whitespace. This is the exact same approach we've been using for years to generate production builds for Meta. The idea is that the only difference between the minified and non- minified builds is whitespace and symbol mangling. The semantic structure of the program should be identical. To implement this, I disabled symbol mangling when running Closure compiler. Then, in a later step, the symbols are mangled by Terser. This is when the source maps are generated.
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In #26446 we started publishing non-minified versions of our production build artifacts, along with source maps, for easier debugging of React when running in production mode. The way it's currently set up is that these builds are generated *before* Closure compiler has run. Which means it's missing many of the optimizations that are in the final build, like dead code elimination. This PR changes the build process to run Closure on the non-minified production builds, too, by moving the sourcemap generation to later in the pipeline. The non-minified builds will still preserve the original symbol names, and we'll use Prettier to add back whitespace. This is the exact same approach we've been using for years to generate production builds for Meta. The idea is that the only difference between the minified and non- minified builds is whitespace and symbol mangling. The semantic structure of the program should be identical. To implement this, I disabled symbol mangling when running Closure compiler. Then, in a later step, the symbols are mangled by Terser. This is when the source maps are generated.
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In #26446 we started publishing non-minified versions of our production build artifacts, along with source maps, for easier debugging of React when running in production mode. The way it's currently set up is that these builds are generated *before* Closure compiler has run. Which means it's missing many of the optimizations that are in the final build, like dead code elimination. This PR changes the build process to run Closure on the non-minified production builds, too, by moving the sourcemap generation to later in the pipeline. The non-minified builds will still preserve the original symbol names, and we'll use Prettier to add back whitespace. This is the exact same approach we've been using for years to generate production builds for Meta. The idea is that the only difference between the minified and non- minified builds is whitespace and symbol mangling. The semantic structure of the program should be identical. To implement this, I disabled symbol mangling when running Closure compiler. Then, in a later step, the symbols are mangled by Terser. This is when the source maps are generated. DiffTrain build for commit 0e0b693.
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In #26446 we started publishing non-minified versions of our production build artifacts, along with source maps, for easier debugging of React when running in production mode. The way it's currently set up is that these builds are generated *before* Closure compiler has run. Which means it's missing many of the optimizations that are in the final build, like dead code elimination. This PR changes the build process to run Closure on the non-minified production builds, too, by moving the sourcemap generation to later in the pipeline. The non-minified builds will still preserve the original symbol names, and we'll use Prettier to add back whitespace. This is the exact same approach we've been using for years to generate production builds for Meta. The idea is that the only difference between the minified and non- minified builds is whitespace and symbol mangling. The semantic structure of the program should be identical. To implement this, I disabled symbol mangling when running Closure compiler. Then, in a later step, the symbols are mangled by Terser. This is when the source maps are generated. DiffTrain build for [0e0b693](0e0b693)
bigfootjon
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Apr 25, 2024
In #26446 we started publishing non-minified versions of our production build artifacts, along with source maps, for easier debugging of React when running in production mode. The way it's currently set up is that these builds are generated *before* Closure compiler has run. Which means it's missing many of the optimizations that are in the final build, like dead code elimination. This PR changes the build process to run Closure on the non-minified production builds, too, by moving the sourcemap generation to later in the pipeline. The non-minified builds will still preserve the original symbol names, and we'll use Prettier to add back whitespace. This is the exact same approach we've been using for years to generate production builds for Meta. The idea is that the only difference between the minified and non- minified builds is whitespace and symbol mangling. The semantic structure of the program should be identical. To implement this, I disabled symbol mangling when running Closure compiler. Then, in a later step, the symbols are mangled by Terser. This is when the source maps are generated. DiffTrain build for commit 0e0b693.
alexandresoro
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Jan 17, 2025
This PR contains the following updates: | Package | Type | Update | Change | |---|---|---|---| | [@types/react](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/react) ([source](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/react)) | devDependencies | major | [`18.3.18` -> `19.0.7`](https://renovatebot.com/diffs/npm/@types%2freact/18.3.18/19.0.7) | | [@types/react-dom](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/react-dom) ([source](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/react-dom)) | devDependencies | major | [`18.3.5` -> `19.0.3`](https://renovatebot.com/diffs/npm/@types%2freact-dom/18.3.5/19.0.3) | | [react](https://react.dev/) ([source](https://github.com/facebook/react/tree/HEAD/packages/react)) | dependencies | major | [`18.3.1` -> `19.0.0`](https://renovatebot.com/diffs/npm/react/18.3.1/19.0.0) | | [react-dom](https://react.dev/) ([source](https://github.com/facebook/react/tree/HEAD/packages/react-dom)) | dependencies | major | [`18.3.1` -> `19.0.0`](https://renovatebot.com/diffs/npm/react-dom/18.3.1/19.0.0) | --- ### Release Notes <details> <summary>facebook/react (react)</summary> ### [`v19.0.0`](https://github.com/facebook/react/blob/HEAD/CHANGELOG.md#1900-December-5-2024) [Compare Source](https://github.com/facebook/react/compare/v18.3.1...v19.0.0) Below is a list of all new features, APIs, deprecations, and breaking changes. Read [React 19 release post](https://react.dev/blog/2024/04/25/react-19) and [React 19 upgrade guide](https://react.dev/blog/2024/04/25/react-19-upgrade-guide) for more information. > Note: To help make the upgrade to React 19 easier, we’ve published a [email protected] release that is identical to 18.2 but adds warnings for deprecated APIs and other changes that are needed for React 19. We recommend upgrading to React 18.3.1 first to help identify any issues before upgrading to React 19. ##### New Features ##### React - Actions: `startTransition` can now accept async functions. Functions passed to `startTransition` are called “Actions”. A given Transition can include one or more Actions which update state in the background and update the UI with one commit. In addition to updating state, Actions can now perform side effects including async requests, and the Action will wait for the work to finish before finishing the Transition. This feature allows Transitions to include side effects like `fetch()` in the pending state, and provides support for error handling, and optimistic updates. - `useActionState`: is a new hook to order Actions inside of a Transition with access to the state of the action, and the pending state. It accepts a reducer that can call Actions, and the initial state used for first render. It also accepts an optional string that is used if the action is passed to a form `action` prop to support progressive enhancement in forms. - `useOptimistic`: is a new hook to update state while a Transition is in progress. It returns the state, and a set function that can be called inside a transition to “optimistically” update the state to expected final value immediately while the Transition completes in the background. When the transition finishes, the state is updated to the new value. - `use`: is a new API that allows reading resources in render. In React 19, `use` accepts a promise or Context. If provided a promise, `use` will suspend until a value is resolved. `use` can only be used in render but can be called conditionally. - `ref` as a prop: Refs can now be used as props, removing the need for `forwardRef`. - **Suspense sibling pre-warming**: When a component suspends, React will immediately commit the fallback of the nearest Suspense boundary, without waiting for the entire sibling tree to render. After the fallback commits, React will schedule another render for the suspended siblings to “pre-warm” lazy requests. ##### React DOM Client - `<form> action` prop: Form Actions allow you to manage forms automatically and integrate with `useFormStatus`. When a `<form> action` succeeds, React will automatically reset the form for uncontrolled components. The form can be reset manually with the new `requestFormReset` API. - `<button> and <input> formAction` prop: Actions can be passed to the `formAction` prop to configure form submission behavior. This allows using different Actions depending on the input. - `useFormStatus`: is a new hook that provides the status of the parent `<form> action`, as if the form was a Context provider. The hook returns the values: `pending`, `data`, `method`, and `action`. - Support for Document Metadata: We’ve added support for rendering document metadata tags in components natively. React will automatically hoist them into the `<head>` section of the document. - Support for Stylesheets: React 19 will ensure stylesheets are inserted into the `<head>` on the client before revealing the content of a Suspense boundary that depends on that stylesheet. - Support for async scripts: Async scripts can be rendered anywhere in the component tree and React will handle ordering and deduplication. - Support for preloading resources: React 19 ships with `preinit`, `preload`, `prefetchDNS`, and `preconnect` APIs to optimize initial page loads by moving discovery of additional resources like fonts out of stylesheet loading. They can also be used to prefetch resources used by an anticipated navigation. ##### React DOM Server - Added `prerender` and `prerenderToNodeStream` APIs for static site generation. They are designed to work with streaming environments like Node.js Streams and Web Streams. Unlike `renderToString`, they wait for data to load for HTML generation. ##### React Server Components - RSC features such as directives, server components, and server functions are now stable. This means libraries that ship with Server Components can now target React 19 as a peer dependency with a react-server export condition for use in frameworks that support the Full-stack React Architecture. The underlying APIs used to implement a React Server Components bundler or framework do not follow semver and may break between minors in React 19.x. See [docs](https://19.react.dev/reference/rsc/server-components) for how to support React Server Components. ##### Deprecations - Deprecated: `element.ref` access: React 19 supports ref as a prop, so we’re deprecating `element.ref` in favor of `element.props.ref`. Accessing will result in a warning. - `react-test-renderer`: In React 19, react-test-renderer logs a deprecation warning and has switched to concurrent rendering for web usage. We recommend migrating your tests to [@​testing-library/react](https://testing-library.com/docs/react-testing-library/intro/) or [@​testing-library/react-native](https://testing-library.com/docs/react-native-testing-library/intro) ##### Breaking Changes React 19 brings in a number of breaking changes, including the removals of long-deprecated APIs. We recommend first upgrading to `18.3.1`, where we've added additional deprecation warnings. Check out the [upgrade guide](https://19.react.dev/blog/2024/04/25/react-19-upgrade-guide) for more details and guidance on codemodding. ##### React - New JSX Transform is now required: We introduced [a new JSX transform](https://legacy.reactjs.org/blog/2020/09/22/introducing-the-new-jsx-transform.html) in 2020 to improve bundle size and use JSX without importing React. In React 19, we’re adding additional improvements like using ref as a prop and JSX speed improvements that require the new transform. - Errors in render are not re-thrown: Errors that are not caught by an Error Boundary are now reported to window.reportError. Errors that are caught by an Error Boundary are reported to console.error. We’ve introduced `onUncaughtError` and `onCaughtError` methods to `createRoot` and `hydrateRoot` to customize this error handling. - Removed: `propTypes`: Using `propTypes` will now be silently ignored. If required, we recommend migrating to TypeScript or another type-checking solution. - Removed: `defaultProps` for functions: ES6 default parameters can be used in place. Class components continue to support `defaultProps` since there is no ES6 alternative. - Removed: `contextTypes` and `getChildContext`: Legacy Context for class components has been removed in favor of the `contextType` API. - Removed: string refs: Any usage of string refs need to be migrated to ref callbacks. - Removed: Module pattern factories: A rarely used pattern that can be migrated to regular functions. - Removed: `React.createFactory`: Now that JSX is broadly supported, all `createFactory` usage can be migrated to JSX components. - Removed: `react-test-renderer/shallow`: This has been a re-export of [react-shallow-renderer](https://github.com/enzymejs/react-shallow-renderer) since React 18. If needed, you can continue to use the third-party package directly. We recommend using [@​testing-library/react](https://testing-library.com/docs/react-testing-library/intro/) or [@​testing-library/react-native](https://testing-library.com/docs/react-native-testing-library/intro) instead. ##### React DOM - Removed: `react-dom/test-utils`: We’ve moved `act` from `react-dom/test-utils` to react. All other utilities have been removed. - Removed: `ReactDOM`.`render`, `ReactDOM`.`hydrate`: These have been removed in favor of the concurrent equivalents: `ReactDOM`.`createRoot` and `ReactDOM.hydrateRoot`. - Removed: `unmountComponentAtNode`: Removed in favor of `root.unmount()`. - Removed: `ReactDOM`.`findDOMNode`: You can replace `ReactDOM`.`findDOMNode` with DOM Refs. ##### Notable Changes ##### React - `<Context>` as a provider: You can now render `<Context>` as a provider instead of `<Context.Provider>`. - Cleanup functions for refs: When the component unmounts, React will call the cleanup function returned from the ref callback. - `useDeferredValue` initial value argument: When provided, `useDeferredValue` will return the initial value for the initial render of a component, then schedule a re-render in the background with the `deferredValue` returned. - Support for Custom Elements: React 19 now passes all tests on [Custom Elements Everywhere](https://custom-elements-everywhere.com/). - StrictMode changes: `useMemo` and `useCallback` will now reuse the memoized results from the first render, during the second render. Additionally, StrictMode will now double-invoke ref callback functions on initial mount. - UMD builds removed: To load React 19 with a script tag, we recommend using an ESM-based CDN such as [esm.sh](http://esm.sh). ##### React DOM - Diffs for hydration errors: In the case of a mismatch, React 19 logs a single error with a diff of the mismatched content. - Compatibility with third-party scripts and extensions: React will now force a client re-render to fix up any mismatched content caused by elements inserted by third-party JS. ##### TypeScript Changes The most common changes can be codemodded with `npx types-react-codemod@latest preset-19 ./path-to-your-react-ts-files`. - Removed deprecated TypeScript types: - `ReactChild` (replacement: `React.ReactElement | number | string)` - `ReactFragment` (replacement: `Iterable<React.ReactNode>`) - `ReactNodeArray` (replacement: `ReadonlyArray<React.ReactNode>`) - `ReactText` (replacement: `number | string`) - `VoidFunctionComponent` (replacement: `FunctionComponent`) - `VFC` (replacement: `FC`) - Moved to `prop-types`: `Requireable`, `ValidationMap`, `Validator`, `WeakValidationMap` - Moved to `create-react-class`: `ClassicComponentClass`, `ClassicComponent`, `ClassicElement`, `ComponentSpec`, `Mixin`, `ReactChildren`, `ReactHTML`, `ReactSVG`, `SFCFactory` - Disallow implicit return in refs: refs can now accept cleanup functions. When you return something else, we can’t tell if you intentionally returned something not meant to clean up or returned the wrong value. Implicit returns of anything but functions will now error. - Require initial argument to `useRef`: The initial argument is now required to match `useState`, `createContext` etc - Refs are mutable by default: Ref objects returned from `useRef()` are now always mutable instead of sometimes being immutable. This feature was too confusing for users and conflicted with legit cases where refs were managed by React and manually written to. - Strict `ReactElement` typing: The props of React elements now default to `unknown` instead of `any` if the element is typed as `ReactElement` - JSX namespace in TypeScript: The global `JSX` namespace is removed to improve interoperability with other libraries using JSX. Instead, the JSX namespace is available from the React package: `import { JSX } from 'react'` - Better `useReducer` typings: Most `useReducer` usage should not require explicit type arguments.\ For example, ```diff -useReducer<React.Reducer<State, Action>>(reducer) +useReducer(reducer) ``` or ```diff -useReducer<React.Reducer<State, Action>>(reducer) +useReducer<State, Action>(reducer) ``` ##### All Changes ##### React - Add support for async Actions ([#​26621](https://github.com/facebook/react/pull/26621), [#​26726](https://github.com/facebook/react/pull/26726), [#​28078](https://github.com/facebook/react/pull/28078), [#​28097](https://github.com/facebook/react/pull/28097), [#​29226](https://github.com/facebook/react/pull/29226), [#​29618](https://github.com/facebook/react/pull/29618), [#​29670](https://github.com/facebook/react/pull/29670), [#​26716](https://github.com/facebook/react/pull/26716) by [@​acdlite](https://github.com/acdlite) and [@​sebmarkbage](https://github.com/sebmarkbage)) - Add `useActionState()` hook to update state based on the result of a Form Action ([#​27270](https://github.com/facebook/react/pull/27270), [#​27278](https://github.com/facebook/react/pull/27278), [#​27309](https://github.com/facebook/react/pull/27309), [#​27302](https://github.com/facebook/react/pull/27302), [#​27307](https://github.com/facebook/react/pull/27307), [#​27366](https://github.com/facebook/react/pull/27366), [#​27370](https://github.com/facebook/react/pull/27370), [#​27321](https://github.com/facebook/react/pull/27321), [#​27374](https://github.com/facebook/react/pull/27374), [#​27372](https://github.com/facebook/react/pull/27372), [#​27397](https://github.com/facebook/react/pull/27397), [#​27399](https://github.com/facebook/react/pull/27399), [#​27460](https://github.com/facebook/react/pull/27460), [#​28557](https://github.com/facebook/react/pull/28557), [#​27570](https://github.com/facebook/react/pull/27570), [#​27571](https://github.com/facebook/react/pull/27571), [#​28631](https://github.com/facebook/react/pull/28631), [#​28788](https://github.com/facebook/react/pull/28788), [#​29694](https://github.com/facebook/react/pull/29694), [#​29695](https://github.com/facebook/react/pull/29695), [#​29694](https://github.com/facebook/react/pull/29694), [#​29665](https://github.com/facebook/react/pull/29665), [#​28232](https://github.com/facebook/react/pull/28232), [#​28319](https://github.com/facebook/react/pull/28319) by [@​acdlite](https://github.com/acdlite), [@​eps1lon](https://github.com/eps1lon), and [@​rickhanlonii](https://github.com/rickhanlonii)) - Add `use()` API to read resources in render ([#​25084](https://github.com/facebook/react/pull/25084), [#​25202](https://github.com/facebook/react/pull/25202), [#​25207](https://github.com/facebook/react/pull/25207), [#​25214](https://github.com/facebook/react/pull/25214), [#​25226](https://github.com/facebook/react/pull/25226), [#​25247](https://github.com/facebook/react/pull/25247), [#​25539](https://github.com/facebook/react/pull/25539), [#​25538](https://github.com/facebook/react/pull/25538), [#​25537](https://github.com/facebook/react/pull/25537), [#​25543](https://github.com/facebook/react/pull/25543), [#​25561](https://github.com/facebook/react/pull/25561), [#​25620](https://github.com/facebook/react/pull/25620), [#​25615](https://github.com/facebook/react/pull/25615), [#​25922](https://github.com/facebook/react/pull/25922), [#​25641](https://github.com/facebook/react/pull/25641), [#​25634](https://github.com/facebook/react/pull/25634), [#​26232](https://github.com/facebook/react/pull/26232), [#​26536](https://github.com/facebook/react/pull/26535), [#​26739](https://github.com/facebook/react/pull/26739), [#​28233](https://github.com/facebook/react/pull/28233) by [@​acdlite](https://github.com/acdlite), [@​MofeiZ](https://github.com/mofeiZ), [@​sebmarkbage](https://github.com/sebmarkbage), [@​sophiebits](https://github.com/sophiebits), [@​eps1lon](https://github.com/eps1lon), and [@​hansottowirtz](https://github.com/hansottowirtz)) - Add `useOptimistic()` hook to display mutated state optimistically during an async mutation ([#​26740](https://github.com/facebook/react/pull/26740), [#​26772](https://github.com/facebook/react/pull/26772), [#​27277](https://github.com/facebook/react/pull/27277), [#​27453](https://github.com/facebook/react/pull/27453), [#​27454](https://github.com/facebook/react/pull/27454), [#​27936](https://github.com/facebook/react/pull/27936) by [@​acdlite](https://github.com/acdlite)) - Added an `initialValue` argument to `useDeferredValue()` hook ([#​27500](https://github.com/facebook/react/pull/27500), [#​27509](https://github.com/facebook/react/pull/27509), [#​27512](https://github.com/facebook/react/pull/27512), [#​27888](https://github.com/facebook/react/pull/27888), [#​27550](https://github.com/facebook/react/pull/27550) by [@​acdlite](https://github.com/acdlite)) - Support refs as props, warn on `element.ref` access ([#​28348](https://github.com/facebook/react/pull/28348), [#​28464](https://github.com/facebook/react/pull/28464), [#​28731](https://github.com/facebook/react/pull/28731) by [@​acdlite](https://github.com/acdlite)) - Support Custom Elements ([#​22184](https://github.com/facebook/react/pull/22184), [#​26524](https://github.com/facebook/react/pull/26524), [#​26523](https://github.com/facebook/react/pull/26523), [#​27511](https://github.com/facebook/react/pull/27511), [#​24541](https://github.com/facebook/react/pull/24541) by [@​josepharhar](https://github.com/josepharhar), [@​sebmarkbage](https://github.com/sebmarkbage), [@​gnoff](https://github.com/gnoff) and [@​eps1lon](https://github.com/eps1lon)) - Add ref cleanup function ([#​25686](https://github.com/facebook/react/pull/25686), [#​28883](https://github.com/facebook/react/pull/28883), [#​28910](https://github.com/facebook/react/pull/28910) by [@​sammy-SC](https://github.com/sammy-SC), [@​jackpope](https://github.com/jackpope), and [@​kassens](https://github.com/kassens)) - Sibling pre-rendering replaced by sibling pre-warming ([#​26380](https://github.com/facebook/react/pull/26380), [#​26549](https://github.com/facebook/react/pull/26549), [#​30761](https://github.com/facebook/react/pull/30761), [#​30800](https://github.com/facebook/react/pull/30800), [#​30762](https://github.com/facebook/react/pull/30762), [#​30879](https://github.com/facebook/react/pull/30879), [#​30934](https://github.com/facebook/react/pull/30934), [#​30952](https://github.com/facebook/react/pull/30952), [#​31056](https://github.com/facebook/react/pull/31056), [#​31452](https://github.com/facebook/react/pull/31452) by [@​sammy-SC](https://github.com/sammy-SC), [@​acdlite](https://github.com/acdlite), [@​gnoff](https://github.com/gnoff), [@​jackpope](https://github.com/jackpope), [@​rickhanlonii](https://github.com/rickhanlonii)) - Don’t rethrow errors at the root ([#​28627](https://github.com/facebook/react/pull/28627), [#​28641](https://github.com/facebook/react/pull/28641) by [@​sebmarkbage](https://github.com/sebmarkbage)) - Batch sync discrete, continuous, and default lanes ([#​25700](https://github.com/facebook/react/pull/25700) by [@​tyao1](https://github.com/tyao1)) - Switch `<Context>` to mean `<Context.Provider>` ([#​28226](https://github.com/facebook/react/pull/28226) by [@​gaearon](https://github.com/gaearon)) - Changes to *StrictMode* - Handle `info`, `group`, and `groupCollapsed` in *StrictMode* logging ([#​25172](https://github.com/facebook/react/pull/25172) by [@​timneutkens](https://github.com/timneutkens)) - Refs are now attached/detached/attached in *StrictMode* ([#​25049](https://github.com/facebook/react/pull/25049) by [@​sammy-SC](https://github.com/sammy-SC)) - Fix `useSyncExternalStore()` hydration in *StrictMode* ([#​26791](https://github.com/facebook/react/pull/26791) by [@​sophiebits](https://github.com/sophiebits)) - Always trigger `componentWillUnmount()` in *StrictMode* ([#​26842](https://github.com/facebook/react/pull/26842) by [@​tyao1](https://github.com/tyao1)) - Restore double invoking `useState()` and `useReducer()` initializer functions in *StrictMode* ([#​28248](https://github.com/facebook/react/pull/28248) by [@​eps1lon](https://github.com/eps1lon)) - Reuse memoized result from first pass ([#​25583](https://github.com/facebook/react/pull/25583) by [@​acdlite](https://github.com/acdlite)) - Fix `useId()` in *StrictMode* ([#​25713](https://github.com/facebook/react/pull/25713) by [@​gnoff](https://github.com/gnoff)) - Add component name to *StrictMode* error messages ([#​25718](https://github.com/facebook/react/pull/25718) by [@​sammy-SC](https://github.com/sammy-SC)) - Add support for rendering BigInt ([#​24580](https://github.com/facebook/react/pull/24580) by [@​eps1lon](https://github.com/eps1lon)) - `act()` no longer checks `shouldYield` which can be inaccurate in test environments ([#​26317](https://github.com/facebook/react/pull/26317) by [@​acdlite](https://github.com/acdlite)) - Warn when keys are spread with props ([#​25697](https://github.com/facebook/react/pull/25697), [#​26080](https://github.com/facebook/react/pull/26080) by [@​sebmarkbage](https://github.com/sebmarkbage) and [@​kassens](https://github.com/kassens)) - Generate sourcemaps for production build artifacts ([#​26446](https://github.com/facebook/react/pull/26446) by [@​markerikson](https://github.com/markerikson)) - Improve stack diffing algorithm ([#​27132](https://github.com/facebook/react/pull/27132) by [@​KarimP](https://github.com/KarimP)) - Suspense throttling lowered from 500ms to 300ms ([#​26803](https://github.com/facebook/react/pull/26803) by [@​acdlite](https://github.com/acdlite)) - Lazily propagate context changes ([#​20890](https://github.com/facebook/react/pull/20890) by [@​acdlite](https://github.com/acdlite) and [@​gnoff](https://github.com/gnoff)) - Immediately rerender pinged fiber ([#​25074](https://github.com/facebook/react/pull/25074) by [@​acdlite](https://github.com/acdlite)) - Move update scheduling to microtask ([#​26512](https://github.com/facebook/react/pull/26512) by [@​acdlite](https://github.com/acdlite)) - Consistently apply throttled retries ([#​26611](https://github.com/facebook/react/pull/26611), [#​26802](https://github.com/facebook/react/pull/26802) by [@​acdlite](https://github.com/acdlite)) - Suspend Thenable/Lazy if it's used in React.Children ([#​28284](https://github.com/facebook/react/pull/28284) by [@​sebmarkbage](https://github.com/sebmarkbage)) - Detect infinite update loops caused by render phase updates ([#​26625](https://github.com/facebook/react/pull/26625) by [@​acdlite](https://github.com/acdlite)) - Update conditional hooks warning ([#​29626](https://github.com/facebook/react/pull/29626) by [@​sophiebits](https://github.com/sophiebits)) - Update error URLs to go to new docs ([#​27240](https://github.com/facebook/react/pull/27240) by [@​rickhanlonii](https://github.com/rickhanlonii)) - Rename the `react.element` symbol to `react.transitional.element` ([#​28813](https://github.com/facebook/react/pull/28813) by [@​sebmarkbage](https://github.com/sebmarkbage)) - Fix crash when suspending in shell during `useSyncExternalStore()` re-render ([#​27199](https://github.com/facebook/react/pull/27199) by [@​acdlite](https://github.com/acdlite)) - Fix incorrect “detected multiple renderers" error in tests ([#​22797](https://github.com/facebook/react/pull/22797) by [@​eps1lon](https://github.com/eps1lon)) - Fix bug where effect cleanup may be called twice after bailout ([#​26561](https://github.com/facebook/react/pull/26561) by [@​acdlite](https://github.com/acdlite)) - Fix suspending in shell during discrete update ([#​25495](https://github.com/facebook/react/pull/25495) by [@​acdlite](https://github.com/acdlite)) - Fix memory leak after repeated setState bailouts ([#​25309](https://github.com/facebook/react/pull/25309) by [@​acdlite](https://github.com/acdlite)) - Fix `useSyncExternalStore()` dropped update when state is dispatched in render phase ([#​25578](https://github.com/facebook/react/pull/25578) by [@​pandaiolo](https://github.com/pandaiolo)) - Fix logging when rendering a lazy fragment ([#​30372](https://github.com/facebook/react/pull/30372) by [@​tom-sherman](https://github.com/tom-sherman)) - Remove string refs ([#​25383](https://github.com/facebook/react/pull/25383), [#​28322](https://github.com/facebook/react/pull/28322) by [@​eps1lon](https://github.com/eps1lon) and [@​acdlite](https://github.com/acdlite)) - Remove Legacy Context ([#​30319](https://github.com/facebook/react/issues/30319) by [@​kassens](https://github.com/kassens)) - Remove `RefreshRuntime.findAffectedHostInstances` ([#​30538](https://github.com/facebook/react/pull/30538) by [@​gaearon](https://github.com/gaearon)) - Remove client caching from `cache()` API ([#​27977](https://github.com/facebook/react/pull/27977), [#​28250](https://github.com/facebook/react/pull/28250) by [@​acdlite](https://github.com/acdlite) and [@​gnoff](https://github.com/gnoff)) - Remove `propTypes` ([#​28324](https://github.com/facebook/react/pull/28324), [#​28326](https://github.com/facebook/react/pull/28326) by [@​gaearon](https://github.com/gaearon)) - Remove `defaultProps` support, except for classes ([#​28733](https://github.com/facebook/react/pull/28733) by [@​acdlite](https://github.com/acdlite)) - Remove UMD builds ([#​28735](https://github.com/facebook/react/pull/28735) by [@​gnoff](https://github.com/gnoff)) - Remove delay for non-transition updates ([#​26597](https://github.com/facebook/react/pull/26597) by [@​acdlite](https://github.com/acdlite)) - Remove `createFactory` ([#​27798](https://github.com/facebook/react/pull/27798) by [@​kassens](https://github.com/kassens)) ##### React DOM - Adds Form Actions to handle form submission ([#​26379](https://github.com/facebook/react/pull/26379), [#​26674](https://github.com/facebook/react/pull/26674), [#​26689](https://github.com/facebook/react/pull/26689), [#​26708](https://github.com/facebook/react/pull/26708), [#​26714](https://github.com/facebook/react/pull/26714), [#​26735](https://github.com/facebook/react/pull/26735), [#​26846](https://github.com/facebook/react/pull/26846), [#​27358](https://github.com/facebook/react/pull/27358), [#​28056](https://github.com/facebook/react/pull/28056) by [@​sebmarkbage](https://github.com/sebmarkbage), [@​acdlite](https://github.com/acdlite), and [@​jupapios](https://github.com/jupapios)) - Add `useFormStatus()` hook to provide status information of the last form submission ([#​26719](https://github.com/facebook/react/pull/26719), [#​26722](https://github.com/facebook/react/pull/26722), [#​26788](https://github.com/facebook/react/pull/26788), [#​29019](https://github.com/facebook/react/pull/29019), [#​28728](https://github.com/facebook/react/pull/28728), [#​28413](https://github.com/facebook/react/pull/28413) by [@​acdlite](https://github.com/acdlite) and [@​eps1lon](https://github.com/eps1lon)) - Support for Document Metadata. Adds `preinit`, `preinitModule`, `preconnect`, `prefetchDNS`, `preload`, and `preloadModule` APIs. - [#​25060](https://github.com/facebook/react/pull/25060), [#​25243](https://github.com/facebook/react/pull/25243), [#​25388](https://github.com/facebook/react/pull/25388), [#​25432](https://github.com/facebook/react/pull/25432), [#​25436](https://github.com/facebook/react/pull/25436), [#​25426](https://github.com/facebook/react/pull/25426), [#​25500](https://github.com/facebook/react/pull/25500), [#​25480](https://github.com/facebook/react/pull/25480), [#​25508](https://github.com/facebook/react/pull/25508), [#​25515](https://github.com/facebook/react/pull/25515), [#​25514](https://github.com/facebook/react/pull/25514), [#​25532](https://github.com/facebook/react/pull/25532), [#​25536](https://github.com/facebook/react/pull/25536), [#​25534](https://github.com/facebook/react/pull/25534), [#​25546](https://github.com/facebook/react/pull/25546), [#​25559](https://github.com/facebook/react/pull/25559), [#​25569](https://github.com/facebook/react/pull/25569), [#​25599](https://github.com/facebook/react/pull/25599), [#​25689](https://github.com/facebook/react/pull/25689), [#​26106](https://github.com/facebook/react/pull/26106), [#​26152](https://github.com/facebook/react/pull/26152), [#​26239](https://github.com/facebook/react/pull/26239), [#​26237](https://github.com/facebook/react/pull/26237), [#​26280](https://github.com/facebook/react/pull/26280), [#​26154](https://github.com/facebook/react/pull/26154), [#​26256](https://github.com/facebook/react/pull/26256), [#​26353](https://github.com/facebook/react/pull/26353), [#​26427](https://github.com/facebook/react/pull/26427), [#​26450](https://github.com/facebook/react/pull/26450), [#​26502](https://github.com/facebook/react/pull/26502), [#​26514](https://github.com/facebook/react/pull/26514), [#​26531](https://github.com/facebook/react/pull/26531), [#​26532](https://github.com/facebook/react/pull/26532), [#​26557](https://github.com/facebook/react/pull/26557), [#​26871](https://github.com/facebook/react/pull/26871), [#​26881](https://github.com/facebook/react/pull/26881), [#​26877](https://github.com/facebook/react/pull/26877), [#​26873](https://github.com/facebook/react/pull/26873), [#​26880](https://github.com/facebook/react/pull/26880), [#​26942](https://github.com/facebook/react/pull/26942), [#​26938](https://github.com/facebook/react/pull/26938), [#​26940](https://github.com/facebook/react/pull/26940), [#​26939](https://github.com/facebook/react/pull/26939), [#​27030](https://github.com/facebook/react/pull/27030), [#​27201](https://github.com/facebook/react/pull/27201), [#​27212](https://github.com/facebook/react/pull/27212), [#​27217](https://github.com/facebook/react/pull/27217), [#​27218](https://github.com/facebook/react/pull/27218), [#​27220](https://github.com/facebook/react/pull/27220), [#​27224](https://github.com/facebook/react/pull/27224), [#​27223](https://github.com/facebook/react/pull/27223), [#​27269](https://github.com/facebook/react/pull/27269), [#​27260](https://github.com/facebook/react/pull/27260), [#​27347](https://github.com/facebook/react/pull/27347), [#​27346](https://github.com/facebook/react/pull/27346), [#​27361](https://github.com/facebook/react/pull/27361), [#​27400](https://github.com/facebook/react/pull/27400), [#​27541](https://github.com/facebook/react/pull/27541), [#​27610](https://github.com/facebook/react/pull/27610), [#​28110](https://github.com/facebook/react/pull/28110), [#​29693](https://github.com/facebook/react/pull/29693), [#​29732](https://github.com/facebook/react/pull/29732), [#​29811](https://github.com/facebook/react/pull/29811), [#​27586](https://github.com/facebook/react/pull/27586), [#​28069](https://github.com/facebook/react/pull/28069) by [@​gnoff](https://github.com/gnoff), [@​sebmarkbage](https://github.com/sebmarkbage), [@​acdlite](https://github.com/acdlite), [@​kassens](https://github.com/kassens), [@​sokra](https://github.com/sokra), [@​sweetliquid](https://github.com/sweetliquid) - Add `fetchPriority` to `<img>` and `<link>` ([#​25927](https://github.com/facebook/react/pull/25927) by [@​styfle](https://github.com/styfle)) - Add support for SVG `transformOrigin` prop ([#​26130](https://github.com/facebook/react/pull/26130) by [@​arav-ind](https://github.com/arav-ind)) - Add support for `onScrollEnd` event ([#​26789](https://github.com/facebook/react/pull/26789) by [@​devongovett](https://github.com/devongovett)) - Allow `<hr>` as child of `<select>` ([#​27632](https://github.com/facebook/react/pull/27632) by [@​SouSingh](https://github.com/SouSingh)) - Add support for Popover API ([#​27981](https://github.com/facebook/react/pull/27981) by [@​eps1lon](https://github.com/eps1lon)) - Add support for `inert` ([#​24730](https://github.com/facebook/react/pull/24730) by [@​eps1lon](https://github.com/eps1lon)) - Add support for `imageSizes` and `imageSrcSet` ([#​22550](https://github.com/facebook/react/pull/22550) by [@​eps1lon](https://github.com/eps1lon)) - Synchronously flush transitions in popstate events ([#​26025](https://github.com/facebook/react/pull/26025), [#​27559](https://github.com/facebook/react/pull/27559), [#​27505](https://github.com/facebook/react/pull/27505), [#​30759](https://github.com/facebook/react/pull/30759) by [@​tyao1](https://github.com/tyao1) and [@​acdlite](https://github.com/acdlite)) - `flushSync` exhausts queue even if something throws ([#​26366](https://github.com/facebook/react/pull/26366) by [@​acdlite](https://github.com/acdlite)) - Throw error if `react` and `react-dom` versions don’t match ([#​29236](https://github.com/facebook/react/pull/29236) by [@​acdlite](https://github.com/acdlite)) - Ensure `srcset` and `src` are assigned last on `<img>` instances ([#​30340](https://github.com/facebook/react/pull/30340) by [@​gnoff](https://github.com/gnoff)) - Javascript URLs are replaced with functions that throw errors ([#​26507](https://github.com/facebook/react/pull/26507), [#​29808](https://github.com/facebook/react/pull/29808) by [@​sebmarkbage](https://github.com/sebmarkbage) and [@​kassens](https://github.com/kassens)) - Treat toggle and beforetoggle as discrete events ([#​29176](https://github.com/facebook/react/pull/29176) by [@​eps1lon](https://github.com/eps1lon)) - Filter out empty `src` and `href` attributes (unless for `<a href=”” />`) ([#​18513](https://github.com/facebook/react/pull/18513), [#​28124](https://github.com/facebook/react/pull/28124) by [@​bvaughn](https://github.com/bvaughn) and [@​eps1lon](https://github.com/eps1lon)) - Fix unitless `scale` style property ([#​25601](https://github.com/facebook/react/pull/25601) by [@​JonnyBurger](https://github.com/JonnyBurger)) - Fix `onChange` error message for controlled `<select>` ([#​27740](https://github.com/facebook/react/pull/27740) by [@​Biki-das](https://github.com/Biki-das)) - Fix focus restore in child windows after element reorder ([#​30951](https://github.com/facebook/react/pull/30951) by [@​ling1726](https://github.com/ling1726)) - Remove `render`, `hydrate`, `findDOMNode`, `unmountComponentAtNode`, `unstable_createEventHandle`, `unstable_renderSubtreeIntoContainer`, and `unstable_runWithPriority`. Move `createRoot` and `hydrateRoot` to `react-dom/client`. ([#​28271](https://github.com/facebook/react/pull/28271) by [@​gnoff](https://github.com/gnoff)) - Remove `test-utils` ([#​28541](https://github.com/facebook/react/pull/28541) by [@​eps1lon](https://github.com/eps1lon)) - Remove `unstable_flushControlled` ([#​26397](https://github.com/facebook/react/pull/26397) by [@​kassens](https://github.com/kassens)) - Remove legacy mode ([#​28468](https://github.com/facebook/react/pull/28468) by [@​gnoff](https://github.com/gnoff)) - Remove `renderToStaticNodeStream()` ([#​28873](https://github.com/facebook/react/pull/28873) by [@​gnoff](https://github.com/gnoff)) - Remove `unstable_renderSubtreeIntoContainer` ([#​29771](https://github.com/facebook/react/pull/29771) by [@​kassens](https://github.com/kassens)) ##### React DOM Server - Stable release of React Server Components ([Many, many PRs](https://github.com/facebook/react/pulls?q=is%3Apr+is%3Aclosed+%5BFlight%5D+in%3Atitle+created%3A%3C2024-12-01+) by [@​sebmarkbage](https://github.com/sebmarkbage), [@​acdlite](https://github.com/acdlite), [@​gnoff](https://github.com/gnoff), [@​sammy-SC](https://github.com/sammy-SC), [@​gaearon](https://github.com/gaearon), [@​sophiebits](https://github.com/sophiebits), [@​unstubbable](https://github.com/unstubbable), [@​lubieowoce](https://github.com/lubieowoce)) - Support Server Actions ([#​26124](https://github.com/facebook/react/pull/26124), [#​26632](https://github.com/facebook/react/pull/26632), [#​27459](https://github.com/facebook/react/pull/27459) by [@​sebmarkbage](https://github.com/sebmarkbage) and [@​acdlite](https://github.com/acdlite)) - Changes to SSR - Add external runtime which bootstraps hydration on the client for binary transparency ([#​25437](https://github.com/facebook/react/pull/25437), [#​26169](https://github.com/facebook/react/pull/26169), [#​25499](https://github.com/facebook/react/pull/25499) by [@​MofeiZ](https://github.com/mofeiZ) and [@​acdlite](https://github.com/acdlite)) - Support subresource integrity for `bootstrapScripts` and `bootstrapModules` ([#​25104](https://github.com/facebook/react/pull/25104) by [@​gnoff](https://github.com/gnoff)) - Fix null bytes written at text chunk boundaries ([#​26228](https://github.com/facebook/react/pull/26228) by [@​sophiebits](https://github.com/sophiebits)) - Fix logic around attribute serialization ([#​26526](https://github.com/facebook/react/pull/26526) by [@​gnoff](https://github.com/gnoff)) - Fix precomputed chunk cleared on Node 18 ([#​25645](https://github.com/facebook/react/pull/25645) by [@​feedthejim](https://github.com/feedthejim)) - Optimize end tag chunks ([#​27522](https://github.com/facebook/react/pull/27522) by [@​yujunjung](https://github.com/yujunjung)) - Gracefully handle suspending in DOM configs ([#​26768](https://github.com/facebook/react/pull/26768) by [@​sebmarkbage](https://github.com/sebmarkbage)) - Check for nullish values on ReactCustomFormAction ([#​26770](https://github.com/facebook/react/pull/26770) by [@​sebmarkbage](https://github.com/sebmarkbage)) - Preload `bootstrapModules`, `bootstrapScripts`, and update priority queue ([#​26754](https://github.com/facebook/react/pull/26754), [#​26753](https://github.com/facebook/react/pull/26753), [#​27190](https://github.com/facebook/react/pull/27190), [#​27189](https://github.com/facebook/react/pull/27189) by [@​gnoff](https://github.com/gnoff)) - Client render the nearest child or parent suspense boundary if replay errors or is aborted ([#​27386](https://github.com/facebook/react/pull/27386) by [@​sebmarkbage](https://github.com/sebmarkbage)) - Don't bail out of flushing if we still have pending root tasks ([#​27385](https://github.com/facebook/react/pull/27385) by [@​sebmarkbage](https://github.com/sebmarkbage)) - Ensure Resumable State is Serializable ([#​27388](https://github.com/facebook/react/pull/27388) by [@​sebmarkbage](https://github.com/sebmarkbage)) - Remove extra render pass when reverting to client render ([#​26445](https://github.com/facebook/react/pull/26445) by [@​acdlite](https://github.com/acdlite)) - Fix unwinding context during selective hydration ([#​25876](https://github.com/facebook/react/pull/25876) by [@​tyao1](https://github.com/tyao1)) - Stop flowing and then abort if a stream is cancelled ([#​27405](https://github.com/facebook/react/pull/27405) by [@​sebmarkbage](https://github.com/sebmarkbage)) - Pass cancellation reason to abort ([#​27536](https://github.com/facebook/react/pull/27536) by [@​sebmarkbage](https://github.com/sebmarkbage)) - Add `onHeaders` entrypoint option ([#​27641](https://github.com/facebook/react/pull/27641), [#​27712](https://github.com/facebook/react/pull/27712) by [@​gnoff](https://github.com/gnoff)) - Escape `<style>` and `<script>` textContent to enable rendering inner content without dangerouslySetInnerHTML ([#​28870](https://github.com/facebook/react/pull/28870), [#​28871](https://github.com/facebook/react/pull/28871) by [@​gnoff](https://github.com/gnoff)) - Fallback to client replaying actions for Blob serialization ([#​28987](https://github.com/facebook/react/pull/28987) by [@​sebmarkbage](https://github.com/sebmarkbage)) - Render Suspense fallback if boundary contains new stylesheet during sync update ([#​28965](https://github.com/facebook/react/pull/28965) by [@​gnoff](https://github.com/gnoff)) - Fix header length tracking ([#​30327](https://github.com/facebook/react/issues/30327) by [@​gnoff](https://github.com/gnoff)) - Use `srcset` to trigger load event on mount ([#​30351](https://github.com/facebook/react/issues/30351) by [@​gnoff](https://github.com/gnoff)) - Don't perform work when closing stream ([#​30497](https://github.com/facebook/react/issues/30497) by [@​gnoff](https://github.com/gnoff)) - Allow aborting during render ([#​30488](https://github.com/facebook/react/issues/30488), [#​30730](https://github.com/facebook/react/pull/30730) by [@​gnoff](https://github.com/gnoff)) - Start initial work immediately ([#​31079](https://github.com/facebook/react/issues/31079) by [@​gnoff](https://github.com/gnoff)) - A transition flowing into a dehydrated boundary no longer suspends when showing fallback ([#​27230](https://github.com/facebook/react/pull/27230) by [@​acdlite](https://github.com/acdlite)) - Fix selective hydration triggers false update loop error ([#​27439](https://github.com/facebook/react/pull/27439) by [@​acdlite](https://github.com/acdlite)) - Warn for Child Iterator of all types but allow Generator Components ([#​28853](https://github.com/facebook/react/pull/28853) by [@​sebmarkbage](https://github.com/sebmarkbage)) - Include regular stack trace in serialized errors ([#​28684](https://github.com/facebook/react/pull/28684), [#​28738](https://github.com/facebook/react/pull/28738) by [@​sebmarkbage](https://github.com/sebmarkbage)) - Aborting early no longer infinitely suspends ([#​24751](https://github.com/facebook/react/pull/24751) by [@​sebmarkbage](https://github.com/sebmarkbage)) - Fix hydration warning suppression in text comparisons ([#​24784](https://github.com/facebook/react/pull/24784) by [@​gnoff](https://github.com/gnoff)) - Changes to error handling in SSR - Add diffs to hydration warnings ([#​28502](https://github.com/facebook/react/pull/28502), [#​28512](https://github.com/facebook/react/pull/28512) by [@​sebmarkbage](https://github.com/sebmarkbage)) - Make Error creation lazy ([#​24728](https://github.com/facebook/react/pull/24728) by [@​sebmarkbage](https://github.com/sebmarkbage)) - Remove recoverable error when a sync update flows into a dehydrated boundary ([#​25692](https://github.com/facebook/react/pull/25692) by [@​sebmarkbage](https://github.com/sebmarkbage)) - Don't "fix up" mismatched text content with suppressedHydrationWarning ([#​26391](https://github.com/facebook/react/pull/26391) by [@​sebmarkbage](https://github.com/sebmarkbage)) - Fix component stacks in errors ([#​27456](https://github.com/facebook/react/pull/27456) by [@​sebmarkbage](https://github.com/sebmarkbage)) - Add component stacks to `onError` ([#​27761](https://github.com/facebook/react/pull/27761), [#​27850](https://github.com/facebook/react/pull/27850) by [@​gnoff](https://github.com/gnoff) and [@​sebmarkbage](https://github.com/sebmarkbage)) - Throw hydration mismatch errors once ([#​28502](https://github.com/facebook/react/pull/28502) by [@​sebmarkbage](https://github.com/sebmarkbage)) - Add Bun streaming server renderer ([#​25597](https://github.com/facebook/react/pull/25597) by [@​colinhacks](https://github.com/colinhacks)) - Add nonce support to bootstrap scripts ([#​26738](https://github.com/facebook/react/pull/26738) by [@​danieltott](https://github.com/danieltott)) - Add `crossorigin` support to bootstrap scripts ([#​26844](https://github.com/facebook/react/pull/26844) by [@​HenriqueLimas](https://github.com/HenriqueLimas)) - Support `nonce` and `fetchpriority` in preload links ([#​26826](https://github.com/facebook/react/pull/26826) by [@​liuyenwei](https://github.com/liuyenwei)) - Add `referrerPolicy` to `ReactDOM.preload()` ([#​27096](https://github.com/facebook/react/pull/27096) by [@​styfle](https://github.com/styfle)) - Add server condition for `react/jsx-dev-runtime` ([#​28921](https://github.com/facebook/react/pull/28921) by [@​himself65](https://github.com/himself65)) - Export version ([#​29596](https://github.com/facebook/react/pull/29596) by [@​unstubbable](https://github.com/unstubbable)) - Rename the secret export of Client and Server internals ([#​28786](https://github.com/facebook/react/pull/28786), [#​28789](https://github.com/facebook/react/pull/28789) by [@​sebmarkbage](https://github.com/sebmarkbage)) - Remove layout effect warning on server ([#​26395](https://github.com/facebook/react/pull/26395) by [@​rickhanlonii](https://github.com/rickhanlonii)) - Remove `errorInfo.digest` from `onRecoverableError` ([#​28222](https://github.com/facebook/react/pull/28222) by [@​gnoff](https://github.com/gnoff)) ##### ReactTestRenderer - Add deprecation error to `react-test-renderer` on web ([#​27903](https://github.com/facebook/react/pull/27903), [#​28904](https://github.com/facebook/react/pull/28904) by [@​jackpope](https://github.com/jackpope) and [@​acdlite](https://github.com/acdlite)) - Render with ConcurrentRoot on web ([#​28498](https://github.com/facebook/react/pull/28498) by [@​jackpope](https://github.com/jackpope)) - Remove `react-test-renderer/shallow` export ([#​25475](https://github.com/facebook/react/pull/25475), [#​28497](https://github.com/facebook/react/pull/28497) by [@​sebmarkbage](https://github.com/sebmarkbage) and [@​jackpope](https://github.com/jackpope)) ##### React Reconciler - Enable suspending commits without blocking render ([#​26398](https://github.com/facebook/react/pull/26398), [#​26427](https://github.com/facebook/react/pull/26427) by [@​acdlite](https://github.com/acdlite)) - Remove `prepareUpdate` ([#​26583](https://github.com/facebook/react/pull/26583), [#​27409](https://github.com/facebook/react/pull/27409) by [@​sebmarkbage](https://github.com/sebmarkbage) and [@​sophiebits](https://github.com/sophiebits)) ##### React-Is - Enable tree shaking ([#​27701](https://github.com/facebook/react/pull/27701) by [@​markerikson](https://github.com/markerikson)) - Remove `isConcurrentMode` and `isAsyncMode` methods ([#​28224](https://github.com/facebook/react/pull/28224) by [@​gaearon](https://github.com/gaearon)) ##### useSyncExternalStore - Remove React internals access ([#​29868](https://github.com/facebook/react/pull/29868) by [@​phryneas](https://github.com/phryneas)) - Fix stale selectors keeping previous store references ([#​25969](https://github.com/facebook/react/pull/25968) by [@​jellevoost](https://github.com/jellevoost)) </details> --- ### Configuration 📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined). 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about these updates again. --- - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box --- This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate). <!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzOS45OS4wIiwidXBkYXRlZEluVmVyIjoiMzkuMTEzLjAiLCJ0YXJnZXRCcmFuY2giOiJtYWluIiwibGFiZWxzIjpbImRlcGVuZGVuY2llcyJdfQ==--> Reviewed-on: https://git.tristess.app/alexandresoro/ouca-web/pulls/6 Reviewed-by: Alexandre Soro <[email protected]> Co-authored-by: renovate <[email protected]> Co-committed-by: renovate <[email protected]>
This was referenced Jan 19, 2025
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Summary
This PR updates the Rollup build pipeline to generate sourcemaps for production build artifacts like
react-dom.production.min.js.It requires the Rollup v3 changes that were just merged in #26442 .
Sourcemaps are currently only generated for build artifacts that are truly "production" - no sourcemaps will be generated for development, profiling, UMD, or
shouldStayReadableartifacts.The generated sourcemaps contain the bundled source contents right before that chunk was minified by Closure, and not the original source files like
react-reconciler/src/*. This better reflects the actual code that is running as part of the bundle, with all the feature flags and transformations that were applied to the source files to generate that bundle. The sourcemaps do still show comments and original function names, thus improving debuggability for production usage.Fixes #20186 .
This allows React users to actually debug a readable version of the React bundle in production scenarios. It also allows other tools like Replay to do a better job inspecting the React source when stepping through.
How did you test this change?
I've attached a set of production files + their sourcemaps here:
react-sourcemap-examples.zip
You can drag JS+sourcemap file pairs into https://evanw.github.io/source-map-visualization/ for viewing.
Examples:
react.production.min.js:react-dom.production.min.js:use-sync-external-store/with-selector.production.min.js: