workbox/gulp-tasks/build.js

/*
 Copyright 2016 Google Inc. All Rights Reserved.
 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 path = require('path');
const gulp = require('gulp');
const chalk = require('chalk');
const promisify = require('promisify-node');

const {taskHarness, buildJSBundle} = require('../utils/build');

const fsePromise = promisify('fs-extra');

const printHeading = (heading) => {
  /* eslint-disable no-console */
  process.stdout.write(chalk.inverse(`  ⚒️  ${heading}  `));
  /* eslint-enable no-console */
};

const printBuildTime = (buildTime) => {
  process.stdout.write(chalk.inverse(`${buildTime}  \n`));
};

/**
 * Buids a given project.
 * @param {String} projectPath The path to a project directory.
 * @return {Promise} Resolves if building succeeds, rejects if it fails.
 */
const buildPackage = (projectPath) => {
  printHeading(`Building ${path.basename(projectPath)}`);
  const startTime = Date.now();
  const buildDir = `${projectPath}/build`;

  // Copy over package.json and README.md so that build/ contains what we
  // need to publish to npm.
  return fsePromise.emptyDir(buildDir)
    .then(() => {
      // Let each project define its own build process.
      const build = require(`${projectPath}/build.js`);
      return build();
    })
    .then(() => {
      return fsePromise.copy(
        path.join(__dirname, '..', 'LICENSE'),
        path.join(projectPath, 'LICENSE'));
    })
    .then(() => {
      printBuildTime(((Date.now() - startTime) / 1000) + 's');
    });
};

gulp.task('build:shared', () => {
  return buildJSBundle({
    rollupConfig: {
      entry: path.join(__dirname, '..', 'lib', 'log-helper.js'),
      format: 'umd',
      moduleName: 'goog.logHelper',
      plugins: [],
    },
    buildPath: 'build/log-helper.js',
    projectDir: path.join(__dirname, '..'),
  });
});

gulp.task('build', () => {
  // Start a new line before the build package logs start.
  console.log();

  return taskHarness(buildPackage, global.projectOrStar)
  .then(() => {
    // End new line before the rest of logs start
    console.log();
  });
});

gulp.task('build:watch', ['build'], (unusedCallback) => {
  gulp.watch(`packages/${global.projectOrStar}/src/**/*`, ['build']);
  gulp.watch(`lib/**/*`, ['build']);
});