Getting/Setting Typescript class properties dynamically

app.ts

class Passport {
    ecl: string = '';
    pid: string = '';
    eyr: string = '';
    hcl: string = '';
    byr: string = '';
    hgt: string = '';
    iyr: string = '';
    cid: string = '';
}

function getProperty<T, K extends keyof T>(obj: T, key: K) {
    return obj[key];
}

function setProperty<T, K extends keyof T>(obj: T, key: K, value: T[K]) {
    obj[key] = value;
}

//Instead of using passport.byr = 'myvalue', we'll set using a dynamic property
var passport = new Passport();
var dynProp = 'byr';
setProperty(passport, dynProp as keyof Passport, 'myvalue');