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Closure Compiler is a JavaScript optimizing compiler. It parses your JavaScript, analyzes it, removes dead code and rewrites and minimizes what's left. It also checks syntax, variable references, and types, and warns about common JavaScript pitfalls. It is used in many of Google's JavaScript apps, including Gmail, Google Web Search, Google Maps, and Google Docs. This binary checks for style issues such as incorrect or missing JSDoc usage, and missing goog.require() statements. It does not do more advanced checks such as typechecking.

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#!/usr/bin/env node

/*
 * Copyright 2016 The Closure Compiler Authors.
 *
 * 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.
 */

'use strict';

const fs = require('fs');
const path = require('path');

/*
 * Known resource roots. Resources outside these roots will throw an Error.
 * Files found here will have the root removed, and the value prefixed (e.g.
 * "javascript/externs/foo.js" => "externs/foo.js".
 */
const roots = {
  'com/google/javascript/jscomp': '',
  'com/google/javascript': '',
  'javascript/externs': 'externs',
};

/**
 * Filter filenames that should not be included.
 *
 * @param {string} filename
 * @return {boolean} Whether to include the file.
 */
function filter(filename) {
  // TODO(thorogood): This file contains Google-internal code that we can't
  // strip out right now. Remove this when we can build resources.json in
  // open-source land (b/30904071).
  return !filename.endsWith('externs/chrome.js');
}

/**
 * Finds a matching root for the given filename, and flattens into a common
 * namespace.
 *
 * @param {string} filename
 * @return {string} Local filename for use in the resources JSON.
 */
function relativize(filename) {
  for (let root in roots) {
    const index = filename.indexOf(root + '/');
    if (index === -1) {
      continue;
    } else if (index !== 0 && filename[index-1] !== '/') {
      continue;  // not at start, or after a seperator
    }
    const tail = filename.substr(index + root.length + 1);  // remove root
    return path.join(roots[root], tail);
  }
  throw new Error('file not matched by build_resources.js known roots: '
      + filename);
}

const reads = process.argv.slice(2).filter(filter).map(filename => {
  const local = relativize(filename);
  return new Promise((fulfill, reject) =>
    fs.readFile(filename, 'utf8', (err, data) => {
      if (err) {
        reject(err);
      } else {
        fulfill({file: local, contents: data});
      }
    }));
});

Promise.all(reads).then(
  results => {
    // Builds an object in the form {path: {name: contents}}. This allows quick
    // enumeration over contents of a directory.
    const files = {};
    for (let result of results) {
      files[result.file] = result.contents;
    }
    console.log(JSON.stringify(files));
  }).catch(err => {
    console.error(err.message);
    process.exit(1);
  });