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docs: update extending-matchers.md (#3557)
Co-authored-by: Vladimir <sleuths.slews0s@icloud.com>
authored by
sagargurtu
Vladimir
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(Jun 20, 2023, 12:44 PM +0200)
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docs/guide/extending-matchers.md
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docs/guide/extending-matchers.md
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If you are using TypeScript, since Vitest 0.31.0 you can extend default `Assertion` interface in an ambient declaration file (e.g: `vitest.d.ts`) with the code below:
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```ts
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import type { Assertion, AsymmetricMatchersContaining } from 'vitest'
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interface CustomMatchers<R = unknown> {
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toBeFoo(): R
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}