Function normalizeTextStyle

libs/echarts/echarts.simple.js:8386–8390

* @param {module:zrender/graphic/Style} style * @return {module:zrender/graphic/Style} The input style.

(style)

 * @return {module:zrender/graphic/Style} The input style.
 */
function normalizeTextStyle(style) {
    normalizeStyle(style);
    each$1(style.rich, normalizeStyle);
    return style;
}

function normalizeStyle(style) {
    if (style) {