TypeScript array with minimum length

Question

How can you create a type in TypeScript that only accepts arrays with two or more elements?

needsTwoOrMore([\"onlyOne\"]) // should have error
needsTwoOrMore         


        

Answer 1

type FixedTwoArray = [T,T]
interface TwoOrMoreArray extends Array {
    0: T
    1: T
}

let x: FixedTwoArray = [1,2];
let y: TwoOrMoreArray = ['a','b','c'];

TypeScript Playground