Typescript constructor overload

typescript-constructor-overload.ts

class Item {
    a: string;
    b: string;

    constructor(a: string, b: string);
    constructor(item: {a: string, b: string});
    constructor(...args: any[]) {
        
        if (args.length === 2) {
            this.a = args[0]
            this.b = args[1]
        } else if (args.length === 1) {
            this.a = args[0].a
            this.b = args[0].b
        }

        console.log(this.a, this.b)
    }
}


new Item('a1', 'b1')
new Item({a: 'a2', b: 'b2'})

/*
** OUTPUT **

[LOG]: "a1",  "b1" 
[LOG]: "a2",  "b2" 
*/