@polymer/polymer/lib/legacy/polymer-fn.js

The Polymer library makes it easy to create your own web components. Give your element some markup and properties, and then use it on a site. Polymer provides features like dynamic templates and data binding to reduce the amount of boilerplate you need to

/**
@license
Copyright (c) 2017 The Polymer Project Authors. All rights reserved.
This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
Code distributed by Google as part of the polymer project is also
subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
*/
import { Class } from './class.js';

import '../utils/boot.js';

/**
 * Legacy class factory and registration helper for defining Polymer
 * elements.
 *
 * This method is equivalent to
 *
 *     import {Class} from '@polymer/polymer/lib/legacy/class.js';
 *     customElements.define(info.is, Class(info));
 *
 * See `Class` for details on valid legacy metadata format for `info`.
 *
 * @global
 * @override
 * @function
 * @param {!PolymerInit} info Object containing Polymer metadata and functions
 *   to become class methods.
 * @return {function(new: HTMLElement)} Generated class
 * @suppress {duplicate, invalidCasts, checkTypes}
 */
const Polymer = function(info) {
  // if input is a `class` (aka a function with a prototype), use the prototype
  // remember that the `constructor` will never be called
  let klass;
  if (typeof info === 'function') {
    klass = info;
  } else {
    klass = Polymer.Class(info);
  }
  // Copy opt out for `legacyNoObservedAttributes` from info object to class.
  if (info._legacyForceObservedAttributes) {
    klass.prototype._legacyForceObservedAttributes = info._legacyForceObservedAttributes;
  }
  customElements.define(klass.is, /** @type {!HTMLElement} */(klass));
  return klass;
};

Polymer.Class = Class;

export { Polymer };