cesiumBack/config-overrides.js

const path = require('path')
const CopyWebpackPlugin = require('copy-webpack-plugin')
const webpack = require('webpack')
const cesiumSource = './node_modules/cesium/Source'
const cesiumWorkers = '../Build/Cesium/Workers'

module.exports = (config, env) => {
  const plugins = [
    new CopyWebpackPlugin([{ from: path.join(cesiumSource, cesiumWorkers), to: 'Workers' }]),
    new CopyWebpackPlugin([{ from: path.join(cesiumSource, 'Assets'), to: 'Assets' }]),
    new CopyWebpackPlugin([{ from: path.join(cesiumSource, 'Widgets'), to: 'Widgets' }]),
    new CopyWebpackPlugin([{ from: path.join(cesiumSource, 'ThirdParty/Workers'), to: 'ThirdParty/Workers' }]),
    new webpack.DefinePlugin({
      CESIUM_BASE_URL: JSON.stringify('./')
    })
  ]
  config.plugins = config.plugins.concat(plugins)
  return config
}