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typescript assertion functions #2622

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ghost opened this issue Dec 11, 2020 · 2 comments
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typescript assertion functions #2622

ghost opened this issue Dec 11, 2020 · 2 comments
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@ghost
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ghost commented Dec 11, 2020

Typescript since 3.7 has a way to declare that a function is an assertion function, which lets it make inferences about null/undefined values.

https://www.typescriptlang.org/docs/handbook/release-notes/typescript-3-7.html#assertion-functions

Is this something ava should support? I can make a PR for it. (It would be conditional on typescript version)
@ghost ghost added the question label Dec 11, 2020
@sindresorhus
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Relevant issue: #2449

@novemberborn
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I don't believe this works with our assertions, being members of our t object.

(I'm closing this issue for housekeeping purposes, but let's keep the conversation going.)

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@novemberborn @sindresorhus