Deferred Object using native Promises

Deferred.js

const noop = () => {};

/**
 * This Class creates a Promise object
 * that has its resolve and reject
 * methods publicly exposed.
 *
 * This allows a user to resolve / reject
 * this promise from outside the Promise function scope.
 */
export default class Deferred {
    constructor() {
        // Private API for telling if
        // promise is still pending.
        this._promiseIsResolved = false;

        this.promise = new Promise((resolve, reject) => {
            this.reject = reject;
            this.resolve = resolve;
        });

        this.promise
            .then(() => {
                // Set promiseIsResolved to true once resolved.
                this.promiseIsResolved = true;
            })
            .catch(noop)
    }
    /**
     * Returns promiseIsResolved variable.
     */
    isResolved() {
        return this._promiseIsResolved;
    }
}