Typescript: instanceof check on interface

Question

Given the following code:

module MyModule {
  export interface IMyInterface {}
  export interface IMyInterfaceA extends IMyInterface {}
  export interface IM         


        

Answer 1

TypeScript uses duck typing for interfaces, so you should just check if object contains some specific members:

if ((my).someCoolMethodFromA) {
    (my).someCoolMethodFromA();
}