webpack.config.js

const path = require('path');
const webpack = require('webpack');

const src = path.resolve(__dirname, 'src');
const dist = path.resolve(__dirname, 'addon/dist');

module.exports = {
  mode: 'development',

  entry: {
    content: path.join(src, 'scripts/content'),
    background: path.join(src, 'scripts/background'),
    options: path.join(src, 'scripts/options')
  },

  output: {
    path: dist,
    filename: '[name].js'
  },

  devtool: 'cheap-module-source-map',

  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        loader: 'babel-loader',
        query: {
          presets: ['@babel/preset-env']
        }
      },
      {
        test: /\.html$/,
        loader: 'html-loader'
      }
    ]
  },

  resolve: {
    extensions: ['.js']
  },

  plugins: [
    new webpack.EnvironmentPlugin({
      DEBUG: false
    })
  ]
};