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A rest parameter must be of an array type. #23440
Description
When running a rest type with multiple array types an error is thrown. Using (xx | yy)[] works however that is not always desired, due to the fact that it allows for mixing types in one array, and not two different types of arrays.
TypeScript Version: 2.8.1
Code
function dist(x1: number, y1: number, x2: number, y2: number): number
function dist(point1: point, point2: point): number
function dist(...args: number[] | point[]): number {
// function body
}Expected behavior:
...args should not throw an error
Actual behavior:
The following error is thrown
A rest parameter must be of an array type.
Playground Link:
Activity
mhegazy commentedon Apr 16, 2018
I think this is another manifestation to the same underlying issue as #15972. the compiler checks if the type of the rest parameter is just the "Array" type.
I would suggest moving this to #15972.
typescript-bot commentedon May 1, 2018
Automatically closing this issue for housekeeping purposes. The issue labels indicate that it is unactionable at the moment or has already been addressed.