webpack.config.js

const path = require('path');

module.exports = {
    entry: './index.js',
    output: {
        path: path.resolve(__dirname, 'dist'),
        filename: './index.js'
    },

    module: {
        rules: [
            {
                enforce: 'pre',
                test: /\.js$/,
                loader: 'eslint-loader',
                options: {
                    failOnError: true,
                }
            }
        ]
    }
};