polygerrit-ui/app/behaviors/fire-behavior/fire-behavior.html

<!--
@license
Copyright (C) 2019 The Android Open Source Project

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->

<script>
(function(window) {
  'use strict';

  window.Gerrit = window.Gerrit || {};

  /** @polymerBehavior Gerrit.FireBehavior */
  Gerrit.FireBehavior = {
    /**
     * Dispatches a custom event with an optional detail value.
     *
     * @param {string} type Name of event type.
     * @param {*=} detail Detail value containing event-specific
     *   payload.
     * @param {{ bubbles: (boolean|undefined), cancelable: (boolean|undefined),
     *     composed: (boolean|undefined) }=}
     *  options Object specifying options.  These may include:
     *  `bubbles` (boolean, defaults to `true`),
     *  `cancelable` (boolean, defaults to false), and
     *  `composed` (boolean, defaults to true).
     * @return {!Event} The new event that was fired.
     * @override
     */
    fire(type, detail, options) {
      options = options || {};
      detail = (detail === null || detail === undefined) ? {} : detail;
      const event = new Event(type, {
        bubbles: options.bubbles === undefined ? true : options.bubbles,
        cancelable: Boolean(options.cancelable),
        composed: options.composed === undefined ? true: options.composed,
      });
      event.detail = detail;
      this.dispatchEvent(event);
      return event;
    },
  };
})(window);
</script>