Feature Description

Further to my work during the 2025 Q4 Hackathon, this issue is to track work upgrading various packages to add native TypeScript support and increase the TypeScript coverage in the repo.

Do not alter or remove anything below. The following sections will be managed by moderators only.

Acceptance criteria

• All @wordpress/* and react packages support TypeScript natively.

Implementation Brief

• Upgrade all @wordpress/* and react packages in various package.json files to include versions that expose types.
• Update TSConfig to include WordPress core packages (see: https://github.com/google/site-kit-wp/pull/12048/files#diff-b55cdbef4907b7045f32cc5360d48d262cca5f94062e353089f189f4460039e0R14-R16)
• Migrate several components/functions to provide types.

Test Coverage

• Fix all test coverage to include types for Jest helpers/it, etc.

QA Brief

• This change upgrades WordPress packages so a general smoke test of the entire plugin is appropriate.
  • During general QA, if any "unrelated" oddities are noticed unrelated to recent changes, it's likely due to this issue 🙂

Changelog entry

• Upgrade WordPress packages and TypeScript versions.