Typescript - Allowed values for a property

Question

What it the best way in Typescript to only allow a number of value for a property ?

class Foo {
    public type:string         


        

Answer 1

const TYPES = ['a', 'b', 'c'] as const; // TS3.4 syntax
type yourType = typeof TYPES[number]; // 'a'|'b'|'c';