How to use the webpack-theme-color-replacer/forElementUI.changeSelector function in webpack-theme-color-replacer

*/
    config.plugins
      .delete('prefetch')
      .delete('preload')
    // 解决 cli3 热更新失效 https://github.com/vuejs/vue-cli/issues/1559
    config.resolve
      .symlinks(true)
    config
      .plugin('theme-color-replacer')
      .use(ThemeColorReplacer, [{
        fileName: 'css/theme-colors.[contenthash:8].css',
        matchColors: [
          ...forElementUI.getElementUISeries(process.env.VUE_APP_ELEMENT_COLOR) // Element-ui主色系列
        ],
        externalCssFiles: [ './node_modules/element-ui/lib/theme-chalk/index.css' ], // optional, String or string array. Set external css files (such as cdn css) to extract colors.
        changeSelector: forElementUI.changeSelector
      }])
    config
      // 开发环境 sourcemap 不包含列信息
      .when(process.env.NODE_ENV === 'development',
        config => config.devtool('cheap-source-map')
      )
      // 预览环境构建 vue-loader 添加 filename
      .when(process.env.VUE_APP_SCOURCE_LINK === 'TRUE',
        VueFilenameInjector(config, {
          propName: process.env.VUE_APP_SOURCE_VIEWER_PROP_NAME
        })
      )
    // markdown
    config.module
      .rule('md')
      .test(/\.md$/)

*/
    config.plugins
      .delete('prefetch')
      .delete('preload')
    // 解决 cli3 热更新失效 https://github.com/vuejs/vue-cli/issues/1559
    config.resolve
      .symlinks(true)
    config
      .plugin('theme-color-replacer')
      .use(ThemeColorReplacer, [{
        fileName: 'css/theme-colors.[contenthash:8].css',
        matchColors: [
          ...forElementUI.getElementUISeries(process.env.VUE_APP_ELEMENT_COLOR) // Element-ui主色系列
        ],
        externalCssFiles: [ './node_modules/element-ui/lib/theme-chalk/index.css' ], // optional, String or string array. Set external css files (such as cdn css) to extract colors.
        changeSelector: forElementUI.changeSelector
      }])
    config
      // 开发环境
      .when(process.env.NODE_ENV === 'development',
        config => config.devtool('source-map')
      ) // 在WebStorm中调试需要source-map
      // 预览环境构建 vue-loader 添加 filename
      .when(process.env.VUE_APP_SCOURCE_LINK === 'TRUE',
        VueFilenameInjector(config, {
          propName: process.env.VUE_APP_SOURCE_VIEWER_PROP_NAME
        })
      )
    // markdown
    config.module
      .rule('md')
      .test(/\.md$/)

*/
    config.plugins
      .delete('prefetch')
      .delete('preload')
    // 解决 cli3 热更新失效 https://github.com/vuejs/vue-cli/issues/1559
    config.resolve
      .symlinks(true)
    config
      .plugin('theme-color-replacer')
      .use(ThemeColorReplacer, [{
        fileName: 'css/theme-colors.[contenthash:8].css',
        matchColors: [
          ...forElementUI.getElementUISeries(process.env.VUE_APP_ELEMENT_COLOR) // Element-ui主色系列
        ],
        externalCssFiles: [ './node_modules/element-ui/lib/theme-chalk/index.css' ], // optional, String or string array. Set external css files (such as cdn css) to extract colors.
        changeSelector: forElementUI.changeSelector
      }])
    config
      // 开发环境
      .when(process.env.NODE_ENV === 'development',
        // sourcemap不包含列信息
        config => config.devtool('cheap-source-map')
      )
      // TRAVIS 构建 vue-loader 添加 filename
      .when(process.env.VUE_APP_SCOURCE_LINK === 'TRUE',
        VueFilenameInjector(config, {
          propName: process.env.VUE_APP_SOURCE_VIEWER_PROP_NAME
        })
      )
    // markdown
    config.module
      .rule('md')

}
        }),
        // 将theme-changed.scss应用到element-ui，供babel-plugin-component按需加载
        new JoinFileContentPlugin({
            file: 'node_modules/element-theme-chalk/src/common/var.scss',
            prependFile: 'src/css/element-theme/theme-changed.scss'
        }),
        //生成仅包含颜色的替换样式（主题色等）
        new ThemeColorReplacer({
            fileName: 'css/theme-colors.[contenthash:8].css',
            matchColors: [
                ...forElementUI.getElementUISeries(appConfig.themeColor),  //element-ui主色系列
                '#0cdd3a',  //自定义颜色
                '#c655dd',
            ],
            changeSelector: forElementUI.changeSelector,
            isJsUgly: isBuild,
            // injectCss: false,
            // resolveCss(resultCss) { // optional. Resolve result css code as you wish.
            //     return resultCss + youCssCode
            // }
        })
    ]

    if (!isBuild) {
        plugins.push(require('../build/svg2font.js'))
        plugins.push(new webpack.SourceMapDevToolPlugin({
            filename: `${config.sourceMapPath}/[filebase].map`,
            append: isProd ? false : undefined, // undefined会自动加载源码映射，生产环境慎用。false时不会
        }))
    } else {
        // https://webpack.js.org/plugins/source-map-dev-tool-plugin/

}
        }),
        // 将theme-changed.scss应用到element-ui，供babel-plugin-component按需加载
        new JoinFileContentPlugin({
            file: 'node_modules/element-theme-chalk/src/common/var.scss',
            prependFile: 'src/css/element-theme/theme-changed.scss'
        }),
        //生成仅包含颜色的替换样式（主题色等）
        new ThemeColorReplacer({
            fileName: 'css/theme-colors.[contenthash:8].css',
            matchColors: [
                ...forElementUI.getElementUISeries(appConfig.themeColor),  //element-ui主色系列
                '#0cdd3a',  //自定义颜色
                '#c655dd',
            ],
            changeSelector: forElementUI.changeSelector,
            isJsUgly: config.isBuild,
            // injectCss: false,
            // resolveCss(resultCss) { // optional. Resolve result css code as you wish.
            //     return resultCss + youCssCode
            // }
        })
    ],

    node: {
        // prevent webpack from injecting useless setImmediate polyfill because Vue
        // source contains it (although only uses it if it's native).
        setImmediate: false,
        // prevent webpack from injecting mocks to Node native modules
        // that does not make sense for the client
        dgram: 'empty',
        fs: 'empty',