Source: visual-unit/src/gridline-config.js

/**
 * Configuration properties for gridlines.
 *
 * @public
 * @module GridLineConfig
 *
 * @param {boolean} show  Whether to show or hide the grid line. By default true for vertical gridlines.
 * @param {string} zeroLineColor Color of zero line.
 * @param {string} color Color of grid lines.
 * @param {Object} x Configuration of grid lines drawn along x axis.
 * @param {boolean} x.show Whether to show or hide vertical grid lines.
 * @param {Object} y Configuration of grid lines drawn along y axis.
 * @param {boolean} y.show Whether to show or hide horizontal grid lines.
 */