Background

• Prettier has JavaScript API.
• Type definitions for the API is maintained in Definitely Typed.
  • https://www.npmjs.com/package/@types/prettier
  • https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/prettier

Proposal

1. Moves @types/prettier to https://github.com/prettier/prettier.
2. Deprecates @types/prettier.

Pros

• Definitely Typed is a huge repository, so it is slightly hard to fix for us.
• Easy to synchronize type definitions with Prettier's API implementation.
• API users do not need to install @types/prettier, need only prettier.
• Some plugins are implemented in TypeScript, so improving their development experience makes a lot of sense.
  • Migrate to Prettier v3 sveltejs/prettier-plugin-svelte#317 (comment)

Cons

• Increase the maintenance cost.
• Increase the npm package size.

References

• https://www.typescriptlang.org/docs/handbook/declaration-files/publishing.html