feat: support custom slots

[francinelucca]

Extends useSlot functionality to support comparing by __SLOT__ prop, not just component type. This allows consumers to create wrapper for subcomponents while still maintaining support with @primer/react components that use slots

Changelog

New

• tests for useSlots and FormControl to account for new slot functionality

Changed

• update useSlots config and functionality to support comparing by both component types and slot names
• updated components and subcomponents that use useSlots or child.type === comparisons to account for slot names

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

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 (Learn more about how to run integration tests)

[changeset-bot]

🦋 Changeset detected

Latest commit: f50d6b3

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

This PR includes changesets to release 2 packages

Name	Type
@primer/react	Minor
@primer/styled-react	Major

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

[Copilot]

Pull Request Overview

This PR extends the useSlots functionality to support comparing components by their __SLOT__ property in addition to their component type. This enables consumers to create wrapper components around subcomponents while maintaining compatibility with @primer/react components that use slots.

Key Changes:

• Updated useSlots to support slot name identification via __SLOT__ property
• Added __SLOT__ properties to components in both packages to enable slot-based matching
• Modified components using useSlots to support the new slot configuration format

Reviewed Changes

Copilot reviewed 25 out of 25 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
packages/react/src/utils/get-slot-name.ts	New utility function to extract slot names from React elements
packages/react/src/hooks/useSlots.ts	Core logic update to support slot-based matching and new configuration format
packages/react/src/hooks/tests/useSlots.test.tsx	Comprehensive tests for new slot functionality
packages/react/src/FormControl/FormControl.tsx	Updated to use new slot configuration and support slot-based component identification
packages/react/src/FormControl/tests/FormControl.test.tsx	Tests for slot identification with wrapped components
packages/react/src/FormControl/FormControlLabel.tsx	Added __SLOT__ property for slot identification
packages/styled-react/src/components/*.tsx	Added __SLOT__ properties to multiple components for compatibility
Multiple component files	Updated useSlots configurations and component type checks to support slot names

[github-actions]

👋 Hi, this pull request contains changes to the source code that github/github depends on. If you are GitHub staff, we recommend testing these changes with github/github using the integration workflow. Thanks!

[francinelucca]

open to suggestions about this @ts-ignore here
CC: @adierkens

[adierkens]

Didn't want to push to your branch, but this should fix the TS types: 60799a3

[github-actions]

👋 Hi, there are new commits since the last successful integration test. We recommend running the integration workflow once more, unless you are sure the new changes do not affect github/github. Thanks!

[github-actions]

👋 Hi, there are new commits since the last successful integration test. We recommend running the integration workflow once more, unless you are sure the new changes do not affect github/github. Thanks!

[github-actions]

👋 Hi, there are new commits since the last successful integration test. We recommend running the integration workflow once more, unless you are sure the new changes do not affect github/github. Thanks!

[github-actions]

👋 Hi, there are new commits since the last successful integration test. We recommend running the integration workflow once more, unless you are sure the new changes do not affect github/github. Thanks!

[primer-integration]

🟢 ci completed with status success.