code: function handleGoToAllPosts( calypsoPort ) {
  	$( '#editor' ).on( 'click', '.edit-post-fullscreen-mode-close__toolbar a', e => {
  		e.preventDefault();
  		calypsoPort.postMessage( {
  			action: 'goToAllPosts',
  			payload: {
  				unsavedChanges: select( 'core/editor' ).isEditedPostDirty(),
  			},
  		} );
  	} );
  }
docs: Prevents the default closing flow and sends a message to the parent frame to
  perform the navigation on the client side.
  
  @param {MessagePort} calypsoPort Port used for communication with parent frame.