webpack.config.js

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

const ONE_KB = 1000;

module.exports = {
  context: __dirname,
  mode: slsw.lib.webpack.isLocal ? 'development' : 'production',
  entry: slsw.lib.entries,
  devtool: slsw.lib.webpack.isLocal ? 'cheap-module-eval-source-map' : 'source-map',
  resolve: {
    extensions: ['.mjs', '.json', '.ts'],
    symlinks: false,
    cacheWithContext: false,
  },
  output: {
    libraryTarget: 'commonjs',
    path: path.join(__dirname, '.webpack'),
    filename: '[name].js',
  },
  target: 'node12.18',
  externals: [nodeExternals({
    allowlist: 'node-fetch'
  })],
  performance: {
    maxAssetSize: ONE_KB * 100,
    hints: 'error'
  },
  stats: {
    performance: true,
    runtimeModules: true,
  },
  module: {
    rules: [
      {
        test: /\.(j|t)s$/,
        loader: 'babel-loader',
        exclude: [
          [
            path.resolve(__dirname, 'node_modules'),
            path.resolve(__dirname, '.serverless'),
            path.resolve(__dirname, '.webpack'),
          ],
        ],
      },
    ],
  },
};