Typescript enthusiast (ask me about TS). I work at Bloomberg in JavaScript Infrastructure & Tooling . Opinions are my own.
Mar 9, 2022 • 6 tweets • 3 min read
As a follow on to yesterday’s post (inspired by @dagda1's question), what is the difference between using any[], unknown[] or never[] as constraints to the function rest parameter in #TypeScript ?
The answer is that if you use a type parameter for the args, there isn’t much difference. You can’t call the function with anything that isn’t typed as A, since you can’t assign a concrete type to a type parameter.
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Mar 8, 2022 • 5 tweets • 2 min read
A classic problem in Typescript is warping a function in another function. Maybe also changing the parameter in some way in the process. Such as in this questions stackoverflow.com/a/71351477/125… or this one stackoverflow.com/a/71371775/125…
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The first problem is usually how we choose our type parameters. There are two common approaches.
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