How to use the ionicons.addIcons function in ionicons

export function appInitialize(config?: IonicConfig) {
  const win: IonicWindow = window as any;
  const Ionic = (win.Ionic = win.Ionic || {});

  Ionic.config = config;
  applyPolyfills().then(() => defineCustomElements(win));

  // Icons that are used by internal components
  addIcons({
    'arrow-back-sharp': arrowBackSharp,
    'chevron-back': chevronBack,
    'chevron-forward': chevronForward,
    'close-circle': closeCircle,
    'close-sharp': closeSharp,
    'menu-outline': menuOutline,
    'menu-sharp': menuSharp,
    'reorder-two-sharp': reorderTwoSharp,
    'reorder-three-outline': reorderThreeOutline,
    'search-outline': searchOutline,
    'search-sharp': searchSharp,
  });
}

export function appInitialize(config?: IonicConfig) {
  const win: IonicWindow = window as any;
  const Ionic = (win.Ionic = win.Ionic || {});

  Ionic.config = config;

  applyPolyfills().then(() => defineCustomElements(win));

  addIcons({
    'ios-close': close.ios,
    'md-close': close.md,
    'ios-reorder': reorder.ios,
    'md-reorder': reorder.md,
    'ios-menu': menu.ios,
    'md-menu': menu.md,
    'ios-arrow-forward': arrowForward.ios,
    'md-arrow-forward': arrowForward.md,
    'ios-arrow-back': arrowBack.ios,
    'md-arrow-back': arrowBack.md,
    'ios-arrow-down': arrowDown.ios,
    'md-arrow-down': arrowDown.md,
    'ios-search': search.ios,
    'md-search': search.md,
    'ios-close-circle': closeCircle.ios,
    'md-close-circle': closeCircle.md,