feat: add React Compiler support for more components

[joshblack]

Closes N/A

Changelog

New

N/A

Changed

• Enabled React Compiler support for Autocomplete, Banner, Button, ConfirmationDialog, Dialog, PageLayout, Pagination, SelectPanel2, and UnderlineNav.
• Added a patch changeset for the rendering performance improvement.

Removed

N/A

Rollout strategy

• Patch release
• Minor release
• Major release; if selected, include a written rollout or migration plan
• None; if selected, include a brief description as to why

Testing & Reviewing

• npx eslint --no-cache packages/react/src/Autocomplete/**/*.{ts,tsx} packages/react/src/Banner/**/*.{ts,tsx} packages/react/src/Button/**/*.{ts,tsx} packages/react/src/ConfirmationDialog/**/*.{ts,tsx} packages/react/src/Dialog/**/*.{ts,tsx} packages/react/src/PageLayout/**/*.{ts,tsx} packages/react/src/Pagination/**/*.{ts,tsx} packages/react/src/UnderlineNav/**/*.{ts,tsx} packages/react/src/experimental/SelectPanel2/**/*.{ts,tsx}
• Focused tests for Autocomplete, Banner, Button, ConfirmationDialog, Dialog/DialogV1, PageLayout, Pagination, UnderlineNav, and SelectPanel2.
• npm run build && npm test -- --run && npm run type-check && npm run lint && npm run lint:css && npm run format:diff
• Storybook started and responded locally at http://localhost:6006.

ActionMenu, SelectPanel, and TooltipV2 were intentionally left on the ignore list because their focused tests fail after enabling React Compiler and should be migrated in separate PRs with code changes.

Merge checklist

• Added/updated tests (not needed; existing coverage validated)
• Added/updated documentation (not needed)
• Added/updated previews (not needed)
• Changes are SSR compatible
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge
• (GitHub staff only) Integration tests pass at github/github-ui (Learn more about how to run integration tests)

[changeset-bot]

🦋 Changeset detected

Latest commit: facb142

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@primer/react	Patch

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Click here if you're a maintainer who wants to add another changeset to this PR

[github-actions]

⚠️ Action required

👋 Hi, this pull request contains changes to the source code that github/github-ui depends on. If you are GitHub staff, test these changes with github/github-ui using the integration workflow. If this doesn't work, you can also use the original workflow here. Check the integration testing docs for step-by-step instructions. Or, apply the integration-tests: skipped manually label to skip these checks.

To publish a canary release for integration testing, apply the Canary Release label to this PR.

[Copilot]

Pull request overview

This PR expands the set of @primer/react components that are eligible for React Compiler by removing them from the opt-out (“unsupported”) list, and adds a patch changeset to communicate the performance improvement in the next release.

Changes:

• Removed Autocomplete, Banner, Button, ConfirmationDialog, Dialog, PageLayout, Pagination, UnderlineNav, and experimental SelectPanel2 from the React Compiler unsupported patterns list.
• Added a patch changeset describing the rendering performance improvement from React Compiler enablement.

Show a summary per file

File	Description
packages/react/script/react-compiler.mjs	Updates the unsupported glob list so additional components are included in React Compiler transforms.
.changeset/react-compiler-components.md	Adds a patch changeset documenting the performance improvement for the newly-enabled components.

Copilot's findings

• Files reviewed: 2/2 changed files
• Comments generated: 0

[primer-integration]

Integration test results from github/github-ui PR:

  CI Failed
  VRT Waiting
  Projects Waiting

CI check runs linting, type checking, and unit tests. Check the workflow logs for specific failures.

Need help? If you believe this failure is unrelated to your changes, please reach out to the Primer team for assistance.