【技术】webpack警告The 'mode' option has not been set

WARNING in configuration The ‘mode’ option has not been set, webpack
will fallback to ‘production’ for this value. Set ‘mode’ option to
‘development’ or ‘production’ to enable defaults for each environment.
You can also set it to ‘none’ to disable any default behavior. Learn
more: https://webpack.js.org/configuration/mode/

提示这个的时候，需要在webpack配置文件webpack.config.js中，设置mode，如设置为开发环境

module.exports = {
  mode: 'development'
};

参考：https://webpack.js.org/configuration/mode/