webpack.config.js

const path = require('path')
const glob = require('glob')
const webpack = require('webpack')
const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin
const SpeedMeasurePlugin = require('speed-measure-webpack-plugin')
const smp = new SpeedMeasurePlugin()

// Credits: https://hackernoon.com/webpack-creating-dynamically-named-outputs-for-wildcarded-entry-files-9241f596b065
const entryArray = glob.sync('./src/**/lambda.ts')
const entryObject = entryArray.reduce((acc, item) => {
  let name = path.dirname(item.replace('./src/', ''))
  // conforms with Webpack entry API
  // Example: { test: './src/test/lambda.ts' }
  acc[name] = item
  return acc
}, {})

const config = smp.wrap({
  entry: entryObject,
  devtool: 'source-map',
  target: 'node',
  module: {
    rules: [
      {
        test: /\.tsx?$/,
        use: [
          {
            loader: 'ts-loader',
            options: {
              transpileOnly: true,
              experimentalWatchApi: true
            }
          }
        ],
        exclude: /node_modules/
      }
    ]
  },
  optimization: {
    minimize: false
  },
  plugins: [new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/)],
  resolve: {
    extensions: ['.ts', '.js'],
    symlinks: false,
    cacheWithContext: false
  },
  // Output directive will generate build/<function-name>/lambda.js
  output: {
    filename: '[name]/lambda.js',
    path: path.resolve(__dirname, 'build'),
    devtoolModuleFilenameTemplate: '[absolute-resource-path]',
    // credits to Rich Buggy!!!
    libraryTarget: 'commonjs2'
  }
})

if (process.env.BUNDLE_ANALYZER && process.env.BUNDLE_ANALYZER === 'true') {
  config.plugins.push(new BundleAnalyzerPlugin({
    analyzerMode: 'static',
    reportFilename: '../info/bundle-report.html',
    openAnalyzer: false
  }))
}

module.exports = config