@exadel/esl/modules/esl-utils/abstract/observable.js

Exadel Smart Library (ESL) is the lightweight custom elements library that provide a set of super-flexible components

/**
 * Abstract Observable implementation
 * @author Yuliya Adamskaya
 */
export class Observable {
    constructor() {
        this._listeners = new Set();
    }
    addListener(listener) {
        this._listeners.add(listener);
    }
    removeListener(listener) {
        this._listeners.delete(listener);
    }
    fire(...args) {
        this._listeners.forEach((listener) => {
            try {
                listener.apply(this, args);
            }
            catch (e) {
                console.error(e);
            }
        });
    }
}