typescript interface definition with an unknown property key

Question

How to express an interface (IResponse), with one property has a string key (which is not known statically). Below, the key values can be anything like bo

Answer 1

Old question, but here is how I solved the issue for myself.

export interface Foo {
    [key: string]: any;
}

{ something: 0 } as Foo => valid

{ other: 'hello' } as Foo => valid