请问这是什么意思，和老师写的一样但是报错

No configuration file found and no output filename configured via CLI option.

A configuration file could be named 'webpack.config.js' in the current directory.

Use --help to display the CLI options.

//commonjs的模块化

module.exports = {

//打包的入口文件路径

entry: './src/script/main.js',

//输出文件的路径

output: {

//输出文件的路径

path: './dist/js',

//输出文件的名字

filename: 'bundle.js'

}

}