How can I define a type that “implements” an interface?

Question

Classes can implement interfaces:

interface ClockInterface {
    currentTime: Date;
}

class Clock implements ClockInterface {
    currentTime: Date;
    constructor(h: number, m: number) { }
}

How can I define a type that "implements" an interface? I don't understand why the following does not work, as it looks completely reasonable to me:

type DigitalClock implements ClockInterface = {
    currentTime: Date;
    somethingDigital: any;
}

Answer 1

Just use

type DigitalClock = ClockInterface & {
    somethingDigital: any;
}