code: function moveLeft( count ) {
      count = count || 1;
      const moveClasses = [
        CLASSES.MOVE_LEFT,
        CLASSES.MOVE_LEFT_2X,
        CLASSES.MOVE_LEFT_3X
      ];
  
      if ( count < 1 || count > moveClasses.length ) {
        throw new Error( 'MoveTransition: moveLeft count is out of range!' );
      }
  
      _baseTransition.applyClass( moveClasses[count - 1] );
  
      return this;
    }
docs: Move to the left by applying a utility move class.
  @param {Number} count
  How many times to move left as a multiplication of the element's width.
  @returns {MoveTransition} An instance.