Array with min length, and more

[bluelovers]

TypeScript Version: 2.7.0-dev.201xxxxx

Search Terms:

Code

need something like [string, string, ...argv] or [string, string] & string[]

abc(['', '', ''])

function abc(data: [string, string] & string[]){}

Expected behavior:

allow a array with length >= 2

Actual behavior:

array length only allow 2

Playground Link:

Related Issues:

[kpdonn]

type ArrayTwoOrMore<T> = {
    0: T
    1: T
} & Array<T>

declare function abc(data: ArrayTwoOrMore<string>)

abc([]) // got expected error
abc(["a"]) // got expected error 
abc(["a", "b"]) // no error
abc(["a", "b", "c"]) // no error

Playground link

Edit: Converted to stackoverflow question since I didn't notice any already existing: https://stackoverflow.com/questions/49910889/typescript-array-with-minimum-length

[bluelovers]

@kpdonn thx

[bluelovers]

@kpdonn hmm

there has something happen when i use ...argv

console.log(abc([str, n, s])); // => no error
console.log(abc([str, n, s, ...argv])); // => error

[kpdonn]

@bluelovers It looks like spreading argv causes it to see the entire expression as just string[] and lose the information about the earlier indices. It might be worth opening a new issue specifically about that case since it might be considered a bug. Seems like one to me anyway.

[typescript-bot]

Automatically closing this issue for housekeeping purposes. The issue labels indicate that it is unactionable at the moment or has already been addressed.