webpack.config.js

const buildValidations = require('./build-utils/build-validations');
const commonConfig = require('./build-utils/webpack.common');
const argv = require('webpack-nano/argv');
const { merge } = require('webpack-merge');

const addons = (/* string | string[] */ addonsArg) => {
  let addons = Array.isArray(addonsArg)
    ? addonsArg.filter((item) => item !== true)
    : [addonsArg].filter(Boolean);

  return addons.map((addonName) =>
    require(`./build-utils/addons/webpack.${addonName}.js`)
  );
};

module.exports = () => {
  const { env, addons: addonsArg } = argv;

  if (!env) {
    throw new Error(buildValidations.ERR_NO_ENV_FLAG);
  }

  const envConfig = require(`./build-utils/webpack.${env}.js`);
  const mergedConfig = merge(commonConfig, envConfig, ...addons(addonsArg));

  return mergedConfig;
};