x(chart, e, options, useFinalPosition) {
      const position = getRelativePosition(e, chart);
      return getAxisItems(chart, position, 'x', options.intersect, useFinalPosition);
    }
x mode returns the elements that hit-test at the current x coordinate
@function Chart.Interaction.modes.x
@param {Chart} chart - the chart we are returning items from
@param {Event} e - the event we are find things at
@param {InteractionOptions} options - options to use
@param {boolean} [useFinalPosition] - use final element position (animation target)
@return {InteractionItem[]} - items that are found