# What changed in @radix-ui/react-collapsible

> 6 changes in @radix-ui/react-collapsible 1 from its official release notes, upgrade guides and advisories. Each one cited. Sources checked 2026-10-27. HTML: https://unstale.sh/npm/@radix-ui/react-collapsible/

To see which of these apply to a repository, run `npx @unstale/cli init` in it.

## @radix-ui/react-collapsible 1

### Performance

- Improved tree-shaking lets bundlers drop unused components, enabling more effective dead-code elimination. (1.1.17) — [release notes](https://github.com/radix-ui/primitives/blob/925c88b773bb32aecf1b52a296a1a21ba7a720b9/packages/react/collapsible/CHANGELOG.md#1117)

### Tooling

- The package was republished through CI so it includes a provenance attestation. (1.1.18) — [release notes](https://github.com/radix-ui/primitives/blob/925c88b773bb32aecf1b52a296a1a21ba7a720b9/packages/react/collapsible/CHANGELOG.md#1118)

### Fixes and other changes

- Fixed a type regression so callback props declared as methods accept handlers whose parameter is narrower than the prop's. (1.2.1) — [release notes](https://github.com/radix-ui/primitives/blob/925c88b773bb32aecf1b52a296a1a21ba7a720b9/packages/react/collapsible/CHANGELOG.md#121)
- All optional types now allow explicit undefined, for compatibility with TypeScript's exactOptionalPropertyTypes flag. (1.2.0) — [release notes](https://github.com/radix-ui/primitives/blob/925c88b773bb32aecf1b52a296a1a21ba7a720b9/packages/react/collapsible/CHANGELOG.md#120)
- Reverted breaking changes that caused compatibility issues with React Server Components. (1.1.20) — [release notes](https://github.com/radix-ui/primitives/blob/925c88b773bb32aecf1b52a296a1a21ba7a720b9/packages/react/collapsible/CHANGELOG.md#1120)
- Fixed triggers referencing a non-existent element via aria-controls when their content is removed from the DOM. (1.1.13) — [release notes](https://github.com/radix-ui/primitives/blob/925c88b773bb32aecf1b52a296a1a21ba7a720b9/packages/react/collapsible/CHANGELOG.md#1113)