preact.config.js

/**
 * Copyright 2018 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

const { resolve } = require('path');
import { generateSw } from 'preact-cli-workbox-plugin';

/**
 * Function that mutates original webpack config.
 * Supports asynchronous changes when promise is returned.
 *
 * @param {object} config original webpack config.
 * @param {object} env options passed to CLI.
 * @param {WebpackConfigHelpers} helpers object with useful helpers when working with config.
 **/
export default function(config, env, helpers) {
  let { rule } = helpers.getLoadersByName(config, 'babel-loader')[0];
  let babelConfig = rule.options;

  babelConfig.plugins.push('emotion');

  config.resolve.alias.src = resolve(__dirname, 'src');

  const workboxConfig = {
    include: [/\.html$/, /\.js$/, /\.css$/, /\.png$/]
  };

  return generateSw(config, helpers, workboxConfig);
}