webpack.config.js

const path = require("path");
const slsw = require("serverless-webpack");
const nodeExternals = require("webpack-node-externals");

module.exports = {
  entry: slsw.lib.entries,
  target: "node",
  mode: slsw.lib.webpack.isLocal ? "development" : "production",
  optimization: {
    // We no want to minimize our code.
    minimize: false
  },
  performance: {
    // Turn off size warnings for entry points
    hints: false
  },
  devtool: 'cheap-module-source-map',
  externals: [nodeExternals()],
  module: {
    rules: [
       {
        test: /\.ts?$/,
        use: 'babel-loader',
        exclude: /node_modules/
      },
      {
        test: /\.js$/,
        use: ["source-map-loader"],
        enforce: "pre"
      },
    ]
  },
  resolve: {
    extensions: ['.ts']
  },
  output: {
    libraryTarget: "commonjs2",
    path: path.join(__dirname, ".webpack"),
    filename: "[name].js",
    sourceMapFilename: "[file].map"
  }
};