Overleaf/services/web/webpack.config.dev.js

const webpack = require('webpack')
const merge = require('webpack-merge')
const MiniCssExtractPlugin = require('mini-css-extract-plugin')

const base = require('./webpack.config')
const { buildDefaultPolicy } = require('./app/src/infrastructure/CSP')

module.exports = merge(base, {
  mode: 'development',

  // Enable accurate source maps for dev
  devtool: 'source-map',

  plugins: [
    // Extract CSS to a separate file (rather than inlining to a <style> tag)
    new MiniCssExtractPlugin({
      // Output to public/stylesheets directory
      filename: 'stylesheets/[name].css',
    }),

    // Disable React DevTools if DISABLE_REACT_DEVTOOLS is set to "true"
    process.env.DISABLE_REACT_DEVTOOLS === 'true' &&
      new webpack.DefinePlugin({
        __REACT_DEVTOOLS_GLOBAL_HOOK__: '({ isDisabled: true })',
      }),
  ].filter(Boolean),

  devServer: {
    // Expose dev server at www.dev-overleaf.com
    host: '0.0.0.0',
    port: 3808,
    public: 'www.dev-overleaf.com:443',

    headers: {
      'Content-Security-Policy': buildDefaultPolicy(),
    },

    // Customise output to the (node) console
    stats: {
      colors: true, // Enable some coloured highlighting
      // Hide some overly verbose output
      performance: false, // Disable as code is uncompressed in dev mode
      hash: false,
      version: false,
      chunks: false,
      modules: false,
      // Hide copied assets from output
      excludeAssets: [/^js\/ace/, /^js\/libs/, /^js\/cmaps/],
    },
  },
})