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: 47df1c7

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