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fahrradflucht/function-type.ts

Created December 14, 2018 19:39
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function-type.ts
type ArgumentsType<T> = T extends (...args: infer A) => unknown ? A : never;
const add = (a: number, b: number): number => a + b
type Add = typeof add;
function logAdd(...args: ArgumentsType<Add>): ReturnType<Add> {
const [a, b] = args;
const result = add(a, b)
console.log(a, b, result)
return result
}
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fahrradflucht commented Dec 14, 2018 •
edited
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ReturnType<T> is a predefined conditional type.

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