add a line to a object

usertest.ts

interface User {
    id: number,
    name: string,
    [key: string]: unknown,
}

const usertype = {
    id: 1,
    name: 'andreia'
}


function myFunc(object: User, nameObject: string, valueObject: string) {

    return object[nameObject] = valueObject;
}

console.log(myFunc(usertype, 'age', '26'))
console.log(usertype)