type-assertions
Advanced tools
Assertions to test your TypeScript types.
Define a type-tests.ts file and you can make assertions like:
import * as ta from 'type-assertions';
ta.assert<ta.Not<ta.Equal<{x: 1}, never>>>();
ta.assert<ta.Not<ta.Equal<never, {x: 1}>>>();
ta.assert<ta.Not<ta.Equal<{x: 1}, {y: 1}>>>();
ta.assert<ta.Not<ta.Equal<{y: 1}, {x: 1}>>>();
ta.assert<ta.Extends<{x: 1}, any>>();
ta.assert<ta.Not<ta.Extends<any, {x: 1}>>>();
ta.assert<ta.UnionIncludesExact<string | number, string>>();
ta.assert<ta.Not<ta.UnionIncludesExact<string | number, 'hello'>>>();
ta.assert<ta.Not<ta.UnionIncludesExact<number, 'hello'>>>();
When you run the build, you will get errors in typesctipt if any of your assertions are not valid.
MIT
FAQs
Assertions to test your TypeScript types.
The npm package type-assertions receives a total of 13,996 weekly downloads. As such, type-assertions popularity was classified as popular.
We found that type-assertions demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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