I have an Interface and a Class which implements the methods, I didn't find a answer to my Problem by now. I have a function defined myAsyncFunction() in the Interface and i want to make it async:
export interface State {
state: Class;
myAsyncFunction(): any;
}
TypeScript doesn't care if a function uses the async keyword. It only cares that it is a function, what arguments it takes, and what the return value is.
The only significance of the async keyword in that context is that the function will return a promise … which will be matched by any.
To the caller, an async function is just a function that returns a promise:
export interface State {
state: string;
myAsyncFunction(): Promise<any>;
}
const state : State = {
state: 'foo',
myAsyncFunction: async () => 'bar'
};
Function is async when returns a Promise. Here is example how to define async function in interface:
interface Foo {
bar: () => Promise<void>
}
Instead of void you can use any return type you want and of course you can use any parameters you want, for example:
interface Foo {
bar: (test: string) => Promise<boolean>
}