学习配置webpack的时候报错，已经配置了mode，仍然报错

学习配置webpack的时候报警告

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.

const merge = require("webpack-merge");
const baseWebpackConfig = require('./webpack.base.js');
module.exports=merge[baseWebpackConfig,{
mode: 'development',
devServer:{
host:'localhost',
port:'3000',
}
}]

它是说你运行命令的时候没有指定mode，它希望你指定一下,如package.json中的配置，dev1命令就是没有指定mode，dev2就是加了mode的

  "scripts": {
    "dev1": "webpack serve --hot ",
    "dev2": "webpack serve --hot --mode development"
  },