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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 Rollup from 2.x to latest 3.x, and updates associated plugins - Updates deprecated / altered config settings in the Rollup plugin pipeline - Fixes some file extension and import issues related to use of ESM in `react-dom-webpack-server` - Removes a now-obsolete `strip-unused-imports` Rollup plugin - <s>Fixes an _existing_ bug with the Rollup 2.x plugin pipeline on `main` that was causing parts of `DOMProperty.js` to get left out of the `react-dom-webpack-server` JS bundles, by adding a new plugin to tell Rollup to treat that file as if it as side effects</s> This PR should be functionally identical to the other existing "Rollup 3 upgrade" PR at #26078 . I'm filing this as a near-duplicate because I'm ready to push this change through ASAP so that I can follow it up with a PR that adds sourcemap support, that PR's artifact diffing seems like it's possibly stuck and I want to compare the build results, and I've got this set up against latest `main`. <!-- Explain the **motivation** for making this change. What existing problem does the pull request solve? --> This gets React's build setup updated to the latest Rollup version, which is generally a good practice, but also ensures that any further Rollup config tweaks can be done using the current Rollup docs as a reference. ## 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. --> - Made builds from the latest `main` - Updated Rollup package versions and cross-compared the changes I needed to make locally to get successful builds vs #26078 - Diffed the output folders between `main` and this PR, and confirmed that the bundle contents are identical (with the exception of version strings and the `react-dom-webpack-server` bundle fix re-adding missing `DOMProperty.js` content)
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