eslint-loader已经被弃用了，使用eslint-webpack-plugin插件来代替

    安装eslint-webpack-plugin插件

    1. npm install eslint-webpack-plugin -D

    在webpack.config.js配置文件中使用

    const EslintWebpackPlugin = require('eslint-webpack-plugin')
module.exports = {
    plugins: [
        new EslintWebpackPlugin()
    ]
}

    eslint-webpack-plugin插件的相关参数配置参考
    https://webpack.docschina.org/plugins/eslint-webpack-plugin/