import { html, i18n, bind } from 'i18n-element/i18n.js';

class MyI18nElement extends i18n(HTMLElement) {
  ... // a few boilerplate mandatory methods are omitted here
  render() {
    return html`${bind(this, 'my-i18n-element')}
      <span>localizable message with ${this.property}</span>`;
  }
  ...
}

class ExtendedElement extends MyI18nElement {
  render() {
    return html`${bind(this, 'extended-element')}
      <div>extended message with ${this.property}</div>
      ${super.render()}`;
  }
}

class CompositeElement extends i18n(HTMLElement) {
  render() {
    return html`${bind(this /* bound to 'composite-element' */)}
      <div>composite element with ${getMessage()}</div>
      <extended-element></extended-element>`;
  }
}

const binding = bind('get-message', import.meta); // bound to a pseudo-element name

const getMessage = () => html`${'get-message', binding}<span>get message</span>`;

import { html, i18n, bind } from 'i18n-element/i18n.js';

import { Localizable } from 'i18n-element/i18n-element.js';

import { html, i18n, bind } from 'i18n-element/i18n.js';

class AwesomeElement extends i18n(HTMLElement) {
  static get importMeta() { return import.meta; }
  constructor() {
    super();
    this.attachShadow({mode: 'open'});
    this.addEventListener('lang-updated', this._langUpdated.bind(this));
  }
  connectedCallback() { this.invalidate(); }
  _langUpdated(event) { this.invalidate(); }
  render() {
    return html`${bind(this, 'awesome-element')}
      <div>localizable message from ${this.is}</div>`;
  }
  invalidate() {
    render(this.render(), this.shadowRoot);
  }
}
customElements.define('awesome-element', AwesomeElement);

import { LegacyElementMixin } from '@polymer/polymer/lib/legacy/legacy-element-mixin.js';
import { html } from '@polymer/polymer/lib/utils/html-tag.js';

import { Localizable } from 'i18n-element/i18n-element.js';

class LocalizableElement extends Localizable(LegacyElementMixin(HTMLElement)) {
  static get importMeta() { return import.meta; }
  static get template() {
    return html`<span id="label1">Localizable UI label 1</span>`;
  }
  static get is() { return 'localizable-element'; }
}
customElements.define(LocalizableElement.is, LocalizableElement);

import 'i18n-element/define-element.js';

Define = class ThinElement extends Localizable(LegacyElementMixin(HTMLElement)) {
  static get importMeta() { return import.meta; }
  static get template() {
    return html`<span id="label1">Localizable UI label 1</span>`;
  }
  // static get is() can be omitted
}
// customElements.define() can be omitted

import 'i18n-element/i18n-dom-bind.js';

    const useI18nCoreJs = true; // true to use i18n-core.js for preprocessed scripts
    const useI18nFormatDataProperty = true; // true to proprocess to <i18n-format .data=${data}><json-data preprocessed>
    // Diretories are relative to the current directory
    var srcDir = 'clock'; // source files directory before preprocessing; should be changed to 'src' or whatever the target project is configured with
    var tmpDir = 'tmp'; // temporary directory for I18N preprocessing
    var destDir = 'preprocess'; // directory for preprocessed files
    const minifyHtmlTemplates = false; // true to minify HTML template literals (experimental)
    const htmlMinifierOptions = { // options for minification of HTML template literals
      // Same options as polymer build minify: true
      collapseWhitespace: true,
      removeComments: true,
    };
    const extractAnonymousTemplates = false; // true For Polymer 3.0 templates