Typescript mixin

mixin-typescript

import { EventEmitter2 } from 'eventemitter2';

class Core extends EventEmitter2 {
    constructor() {
        super();
        this.init();
    }

    init() {
        console.log('initialised');
    }
}
type Constructor<T = {}> = new (...args: any[]) => T;

function WithUsers<TBase extends Constructor>(Base: TBase) {
    return class extends Base {
        getUserById(id: number) {
            return id;
        }
    };
}

export default WithUsers(Core);