mastodon/config/webpack/development.js

// Note: You must restart bin/webpack-dev-server for changes to take effect

const merge = require('webpack-merge');
const sharedConfig = require('./shared.js');

module.exports = merge(sharedConfig, {
  devtool: 'cheap-module-eval-source-map',

  stats: {
    errorDetails: true,
  },

  output: {
    pathinfo: true,
  },
});