Ensuring Typescript Code Quality With expect-type

Expect Type is a library for type-level testing in TypeScript, allowing developers to write tests for their types similar to how they write tests for runtime behavior.

Expect Type can help improve your TypeScript skills by allowing you to evaluate how TypeScript interacts with your code base and by documenting the type behavior within your team.

No, Expect Type does not require any additional build steps or IDE extensions, and it has no dependencies, ensuring no bloat is added to your node modules.

Yes, Expect Type can be used in production code without any performance concerns since it introduces no runtime overhead.

Expect Type supports testing for various TypeScript features, including complex types, type guard functions, and generic type testing.

Expect Type can be used with any test framework that supports TypeScript, including Jest, Mocha, and Playwright, with built-in support available for VTest.

When using Expect Type, focus on testing edge cases and be selective about what you test. It's more useful for libraries than applications and should be run as part of your CI pipelines.

Expect Type error messages are integrated with the TypeScript CLI, providing detailed messages that help identify mismatches between expected and actual types.

More information about Expect Type is available on its NPM page, GitHub repository, and VTest documentation. The author is also available on X under mmcalc.