webpack.config.js

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

module.exports = {
  entry: slsw.lib.entries, // important
  target: 'node',
  mode: 'production',
  devtool: 'source-map', // important
  externals: [nodeExternals()],
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: [
          {
            loader: 'babel-loader',
          },
        ],
      },
    ],
  },
  output: { // important
    libraryTarget: 'commonjs',
    path: path.join(__dirname, '.webpack'),
    filename: '[name].js',
    sourceMapFilename: '[file].map',
  },
}