/** Worker helper to create a worker from code
 * @constructor
 * @param {function} mainFn main worker function
 * @param {object} options
 *  @param {function} [options.onMessage] a callback function to get worker result
 */
export default class ol_ext_Worker {
  constructor(mainFn: any, options: {
    onMessage: (callback: any) => void;
  });

  /** Terminate current worker and start a new one
   */
  start(): void;

  /** Terminate a worker */
  terminate(): void;

  /** Post a new message to the worker
   * @param {object} message
   * @param {boolean} [restart=false] stop the worker and restart a new one
   */
  postMessage(message: any, restart?: boolean): void;

  /** Set onMessage callback
   * @param {function} fn a callback function to get worker result
   */
  onMessage(fn: (callback: any) => void): void;
}