webpack.config.js

const path = require('path');
const CopyWebpackPlugin = require('copy-webpack-plugin');
const yaml = require('node-yaml');
const nodeExternals = require('webpack-node-externals');

function getFunctions() {
  const serverlessYml = yaml.readSync('serverless.yml');
  const webPackFunctions = {};
  const functionNames = Object.keys(serverlessYml.functions || {});
  functionNames.forEach((name) => {
    const handlerFile = serverlessYml.functions[name].handler.replace(/.[^.]*$/, '');
    webPackFunctions[handlerFile] = `./${handlerFile}.js`;
  });
  return webPackFunctions;
}

module.exports = {
  entry: getFunctions(),
  target: 'node',
  module: {
    rules: [
      { test: /\.json/, loader: 'json-loader' },
    ],
  },
  plugins: [
    new CopyWebpackPlugin([
      { from: '.env' },
    ]),
  ],
  output: {
    libraryTarget: 'commonjs',
    path: path.join(__dirname, '.webpack'),
    filename: '[name].js',
  },
  externals: [nodeExternals()],
};