Method isPromise

src/Utils.js:175–180

* Realm-safe check for Promise (duck-typed as thenable). * Guards against Object.prototype pollution by ensuring `then` is not * inherited solely from Object.prototype. * @param {any} value The value to check. * @returns {Boolean} Returns true if the value is a Promise or thenable.

(value)

   * @returns {Boolean} Returns true if the value is a Promise or thenable.
   */
  static isPromise(value) {
    if (value == null || typeof value.then !== 'function') {
      return false;
    }
    return Object.getPrototypeOf(value) !== Object.prototype || Object.prototype.hasOwnProperty.call(value, 'then');
  }

  /**
   * Realm-safe check for object type. Uses `typeof` instead of `instanceof Object`