webpack.config.js

const path = require("path")
const slsw = require("serverless-webpack")
const nodeExternals = require("webpack-node-externals")
const ForkTsCheckerWebpackPlugin = require('fork-ts-checker-webpack-plugin')
const { SourceMapDevToolPlugin } = require("webpack")

/** @type { import('webpack').Configuration } */
module.exports = {
  context: __dirname,
  mode: slsw.lib.webpack.isLocal ? "development" : "production",
  entry: slsw.lib.entries,
  // See plugins below
  devtool: slsw.lib.webpack.isLocal ? "eval-cheap-module-source-map" : undefined,
  resolve: {
    extensions: [".js", ".mjs", ".ts", ".json"],
    symlinks: false,
    cacheWithContext: false,
  },
  output: {
    libraryTarget: "commonjs",
    path: path.join(__dirname, ".webpack"),
    filename: "[name].js",
  },
  optimization: {
    concatenateModules: false,
  },
  target: "node",
  externals: [nodeExternals({
    allowlist: ['@raise/shared']
  })],
  module: {
    rules: [
      // all files with a `.ts` or `.tsx` extension will be handled by `ts-loader`
      {
        test: /\.(tsx?)$/,
        loader: "ts-loader",
        exclude: [
          [
            path.resolve(__dirname, "node_modules"),
            path.resolve(__dirname, ".serverless"),
            path.resolve(__dirname, ".webpack"),
            path.resolve(__dirname, ".dynamodb"),
          ],
        ],
        options: {
          transpileOnly: true
        },
      },
    ],
  },
  plugins: [
    ...(slsw.lib.webpack.isLocal ? [] : [new SourceMapDevToolPlugin({
      filename: '[file].map',
      // This line appears to help with being able to print stacktraces.
      // Without this I think what is happening is:
      // - We generate massive source maps because we include sources of deps (6 MB+)
      // - We try accessing error.stack (or use a method which does this, like logging an error)
      // - source-map-support means this file is then read, which hangs Node.js
      // - Eventually the function times out and our server is sad - but doesn't alert us well
      noSources: true,
    })]),
    new ForkTsCheckerWebpackPlugin(),
  ],
}