feat: add React Compiler support for SelectPanel

[joshblack]

Closes #

Adds React Compiler support for SelectPanel by removing it from the compiler unsupported list. Updates the empty-state test fixture so it models an async empty load completing under compiler-enabled tests.

Changelog

New

• React Compiler support for SelectPanel

Changed

• Updated SelectPanel empty-state test coverage to be compatible with React Compiler

Removed

• Removed SelectPanel from the React Compiler unsupported list

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/SelectPanel/**/*.{ts,tsx}
• npm test -- --run packages/react/src/SelectPanel/SelectPanel.test.tsx packages/react/src/SelectPanel/SelectPanel.types.test.tsx
• npm run build && npm test -- --run && npm run type-check && npm run lint && npm run lint:css && npm run format:diff
• Verified Storybook responds locally

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Storybook)
• 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: 8a714f3

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 pull request enables React Compiler support for SelectPanel by removing it from the compiler unsupported list and adjusting the empty-state test fixture to model the component’s “initial load” behavior in a compiler-compatible way.

Changes:

• Removed SelectPanel from the React Compiler unsupportedPatterns list so it can be compiled.
• Updated the “no items after initial load” test fixture to update items via state in response to the initial onFilterChange call, allowing SelectPanel’s internal “data loaded once” logic to complete.
• Simplified the empty-state assertion flow by moving the click outside of waitFor and using a non-async waitFor callback.

Show a summary per file

File	Description
packages/react/src/SelectPanel/SelectPanel.test.tsx	Updates the empty-state test fixture to trigger an items identity change on initial load and adjusts waitFor usage for compiler-compatible async behavior.
packages/react/script/react-compiler.mjs	Removes src/SelectPanel/**/*.tsx from the React Compiler unsupported list.
.changeset/react-compiler-select-panel.md	Adds a patch changeset announcing React Compiler support for SelectPanel.

Review details

• Files reviewed: 3/3 changed files
• Comments generated: 0
• Review effort level: Low

[primer-integration]

Integration test results from github/github-ui PR:

  CI Failed
  VRT Passed
  Projects Passed

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.