type-fest/.github/contributing.md

Contributing guidelines

Submitting a new type

• One type addition per pull request, unless they are connected.
• Please help review the other open pull requests.
  • If there are no open pull requests, provide some feedback on some of the open issues.
• Example of a type contribution.
• Create a new file in the test-d directory and write at least one type test.
  • See the other tests for inspiration.
  • If it makes sense, also write a negative test using expectNotAssignable() or, to test other diagnostics, expectError().
• Don't use one-character type names like T and U. Use descriptive names. See the existing types for inspiration.
• Follow the existing code style, even in documentation code examples.
• Write a good documentation comment that includes:
  • Write a short and clear description of what the type does.
    • The first line should match the description in the readme.
  • Write about some real-world use-cases where it can be useful. (It can be hard sometimes for users to see where they would use something)
  • Example code block with a realistic example.
  • At the bottom, explain how the type works. Some types can be quite advanced and hard to understand. We can use this opportunity to teach users.
  • If there has been any discussion somewhere about this type, include a link to it. For example, a discussion on the TypeScript issue tracker.
  • Add relevant @category tags. See other types for examples.
• If you add any internal helper types, they should still be properly documented and tested.
• Add the type to the readme.
• Make sure the file in the source directory uses a .d.ts extension and not .ts.
• Run $ npm test before submitting and make sure it passes.
• Name the pull request Add `TypeName` type.