message: Faster builds: `build-dev` should only build nodejs version
diff: const merge = require('webpack-merge');
  const prod_configs = require('./webpack.config.js');
  -module.exports = prod_configs.map((config) =>
  +module.exports = [
  merge.merge(prod_configs[0], {
  mode: 'development',
  devtool: 'inline-source-map',
  - })
  -);
  + }),
  +];
  