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Type for arbitrary number of function parameters of specified types #4338
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Looks like you want something that allows a variable number of parameters with arbitrary types, but then captures them so they can be repeated in another signature. I think you may find a relevant discussion at #3622 (comment) and #3870.
Do you actually need an infinite number of parameters? If in practice you top out at something like ten or twenty then this might be a good pattern:
function f<T1>(a1: T1): (a1: T1) => any; function f<T1, T2>(a1: T1, a2: T2): (a1: T1, a2: T2) => any; function f<T1, T2, T3>(a1: T1, a2: T2, a3: T3): (a1: T1, a2: T2, a3: T3) => any; function f<T1, T2, T3, T4>(a1: T1, a2: T2, a3: T3, a4: T4): (a1: T1, a2: T2, a3: T3, a4: T4) => any; function f<T1, T2, T3, T4, T5>(a1: T1, a2: T2, a3: T3, a4: T4, a5: T5): (a1: T1, a2: T2, a3: T3, a4: T4, a5: T5) => any; // Continue the theme until you are sure you have met requirements. Maybe ten or twenty arguments? function f(...params: any[]):any { }It's flexible, doesn't require new syntax, and works today.
That is indeed the recommended pattern to use today.
looks like a duplicate of #1773
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on Jun 19, 2018
I'd like to have a type for a function which takes in zero or more parameters, and then use the type for the parameters, e.g.
This is useful in e.g. typing the spread function here:
DefinitelyTyped/DefinitelyTyped@3eb67c9
I need to use the
...args: any[], which is not quite what I'm looking for.In essence, the type I want to use is
[A?, B?, C?, ...], or maybe something likeParams<T>if such an interface would exist.