insomnia/packages/insomnia-app/webpack/webpack.config.development.babel.js

const webpack = require('webpack');
const baseConfig = require('./webpack.config.base.babel');
const pkg = require('../package.json');

const PORT = pkg.dev['dev-server-port'];

module.exports = {
  ...baseConfig,
  devtool: 'eval-source-map',
  mode: 'development',
  entry: [
    `webpack-dev-server/client?http://localhost:${PORT}`,
    'webpack/hot/only-dev-server',
    ...baseConfig.entry,
  ],
  module: {
    ...baseConfig.module,
    rules: [
      ...baseConfig.module.rules,
      {
        test: /\.js$/,
        enforce: 'pre',
        use: ['source-map-loader'],
        include: [/insomnia-components/],
      },
    ],
  },
  output: {
    ...baseConfig.output,
    publicPath: '/',
  },
  devServer: {
    host: 'localhost',
    port: PORT,
    publicPath: '/',
    hot: true,
    disableHostCheck: true,

    // This is needed for source-maps to resolve correctly
    contentBase: '/',
  },
  optimization: {
    noEmitOnErrors: true
  },
  plugins: [
    ...baseConfig.plugins,
    new webpack.LoaderOptionsPlugin({ debug: true }), // Legacy global loader option
    new webpack.HotModuleReplacementPlugin(),
    new webpack.DefinePlugin({
      __DEV__: true,
      'process.env.NODE_ENV': JSON.stringify('development'),
      'process.env.INSOMNIA_ENV': JSON.stringify('development'),
    }),
  ],
};