Description
TypeScript Version: 2.6.2
Code
function takeN<T> (n: number, input: Iterable<T>|ArrayLike<T>): [T[], T[]] {
const array = Array.from(input)
return [array.splice(0, n), array]
}
function takeNv2<T> (n: number, input: Iterable<T>|ArrayLike<T>): [T[], T[]] {
const array = isIterable(input) ? Array.from(input) : Array.from(input)
return [array.splice(0, n), array]
function isIterable(arg: any): arg is Iterable<any> {
return Symbol.iterator in arg
}
}Expected behavior:
takeN to work
Actual behavior:
takeN raises an error on Array.from, because TypeScript does not accept that the input matches more than one overload.
This is either a compiler bug, or the declaration for Array.from needs an overload that accepts either.