vue.config.js

module.exports = {
  publicPath: process.env.NODE_ENV === 'production' ? './' : '/',
  outputDir: 'demo',
  transpileDependencies: ['resize-detector'],
  chainWebpack: config => {
    config
      .entry('app')
      .clear()
      .add('./src/demo/main.js')

    const svgRule = config.module.rule('svg')

    // clear all existing loaders.
    // if you don't do this, the loader below will be appended to
    // existing loaders of the rule.
    svgRule.uses.clear()

    svgRule
      .use('raw-loader')
      .loader('raw-loader')
      .end()

    config.optimization.clear('splitChunks').splitChunks({
      cacheGroups: {
        vue: {
          name: 'echarts',
          test: /[\\/]node_modules[\\/]echarts[\\/]/,
          priority: 0,
          chunks: 'initial'
        },
        vendors: {
          name: 'chunk-vendors',
          test: /[\\/]node_modules[\\/]/,
          priority: -10,
          chunks: 'initial'
        },
        common: {
          name: 'chunk-common',
          minChunks: 2,
          priority: -20,
          chunks: 'initial',
          reuseExistingChunk: true
        }
      }
    })
  }
}