src/intersection-observer.js
/**
   * Provide a function to clear timeout before set this intersection to null.
   */
Provide a function to clear timeout before set this intersection to null.
Provide a function to clear timeout before set this intersection to null .
destroy() {
    this.timer_.cancel(this.flushTimeout_);
    this.unlistenOnOutViewport_();
    this.postMessageApi_.destroy();
  }
destroy ( ) { this . timer_ . cancel ( this . flushTimeout_ ) ; this . unlistenOnOutViewport_ ( ) ; this . postMessageApi_ . destroy ( ) ; }
Provide a function to clear timeout before set this intersection to null.
Provide a function to clear timeout before set this intersection to null .