VS Code typescript: auto-implement interface

Question

I have an interface in typescript and want to autoimplement it.

I\'ve been looking around and according to this stackoverflow question and github issue, this feature

Answer 1

If the interface has no required members, then the code action/quick fix will not appear on the class definition.

interface IFoo {
    x?: number
    y?: number
}

class Foo implements IFoo {
    // no code action shown
}

But if the interface has at least one required member, then the code action will appear, and when clicked, will implement all the members, including the nullable ones.

interface IFoo {
    x: number
    y?: number
}

class Foo implements IFoo {
    // code action will appear.
    // will implement both x and y? when clicked
}

This behavior is due to TypeScript's compiler, not VS Code. You can track this issue as it related to VS Code here, and the TypeScript functionality here.