一个更漂亮的TypeScript匿名类声明？

Question

Is there a more beautiful way to express an anonymous class(?) with typed members in typeScript than this?

class Foo {
    member = {
        aNumber = <number>undefined;
        aBoolean = <bool>undefined;
    }
}

Answer 1

The only anonymous alternative would be:

class Foo {
    member: { aNumber?: number; aBoolean?: bool; } = {
        aNumber: undefined,
        aBoolean: undefined
    }
}

You're usually better off just writing an interface so you can name the type.

Answer 2

Since members are undefined by default you could simply go with:

class Foo {
    member:{aNumber:number;aBoolean:bool;} = <any>{};
}

Answer 3

In newer versions of typescript, this can be achieved using optional properties:

class Foo {
    member: { aNumber?: number; aBoolean?: boolean; } = {}
}