grafana/scripts/webpack/webpack.test.js

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

config = merge(common, {
  devtool: 'cheap-module-source-map',
  externals: {
    'react/addons': true,
    'react/lib/ExecutionEnvironment': true,
    'react/lib/ReactContext': true,
  },
  node: {
    fs: 'empty'
  },
  plugins: [
    new webpack.SourceMapDevToolPlugin({
      filename: null, // if no value is provided the sourcemap is inlined
      test: /\.(ts|js)($|\?)/i // process .js and .ts files only
    })
  ]
});

module.exports = config;