How to use the util function from echarts

AMapCoordSys.js

GitHub: billy-poon/echarts-amap

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// Not support IE8
amapRoot.classList.add('ec-extension-amap');
root.appendChild(amapRoot);

var options = amapModel.get() || {};
options = amapModel.__options = echarts.util.clone(options);
var amap = amapModel.__amap = new AMap.Map(amapRoot, options);

var layer = amapModel.__layer = new AMap.CustomLayer(viewportRoot);
layer.setMap(amap);

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+ 3 other calls in file

WordCloudView.js

GitHub: JINWOO-J/echarts-wordcloud

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group.add(text);

data.setItemGraphicEl(dataIdx, text);
echarts.graphic.setHoverStyle(
    text, echarts.util.extend(
        emphasisTextStyleModel.getItemStyle(),
        {
            font: getFont(emphasisTextStyleModel, textStyleModel)
        }

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+ 11 other calls in file

thumb.js

GitHub: mindskip/xzs

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glob('../*.js', function (err, themePathList) {
    themePathList.forEach(function (themePath) {
        var themeName = path.basename(themePath, '.js');
        var canvasList = [];
        require(themePath);
        echarts.util.each(options, function (option) {
            var canvas = createCanvas();
            var chart = echarts.init(canvas, themeName);
            var optionNeedFix = option;
            if (option.options) {

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