clr-angular-static-fix/utils/loading/loading-listener.ts

1. Install Clarity Icons package through npm:

/*
 * Copyright (c) 2016-2018 VMware, Inc. All Rights Reserved.
 * This software is released under MIT license.
 * The full license information can be found in LICENSE in the root directory of this project.
 */

import { ClrLoadingState } from './loading';

/**
 * This is an abstract class because we need it to still be a valid token for dependency injection after transpiling.
 * This does not mean you should extend it, simply implementing it is fine.
 */
export abstract class LoadingListener {
  abstract loadingStateChange(state: ClrLoadingState): void;
}