text: #!/usr/bin/env node
  
  /**
   * @license
   * Copyright Google Inc. All Rights Reserved.
   *
   * Use of this source code is governed by an MIT-style license that can be
   * found in the LICENSE file at https://angular.io/license
   */
  
  /**
   * GIT commit message format enforcement
   *
   * Note: this script was originally written by Vojta for AngularJS :-)
   */
  
  /* eslint-disable no-console */
  'use strict';
  
  const fs = require('fs');
  const path = require('path');
  const configPath = path.resolve(__dirname, './commit-message.json');
  const config = JSON.parse(fs.readFileSync(configPath, 'utf8'));
  const PATTERN = /^(revert\: )?(\w+)(?:\(([^)]+)\))?\: (.+)$/;
  
  module.exports = function(commitSubject) {
    if (commitSubject.length > config['maxLength']) {
      error(`The commit message is longer than ${config['maxLength']} characters`, commitSubject);
      return false;
    }
  
    const match = PATTERN.exec(commitSubject);
    if (!match || match[2] === 'revert') {
      error(
          'The commit message does not match the format of "<type>(<scope>): <subject> OR revert: type(<scope>): <subject>"',
          commitSubject);
      return false;
    }
  
    const type = match[2];
    if (config['types'].indexOf(type) === -1) {
      error(
          `${type} is not an allowed type.\n => TYPES: ${config['types'].join(', ')}`, commitSubject);
      return false;
    }
  
    const scope = match[3];
  
    if (scope && !config['scopes'].includes(scope)) {
      error(
          `"${scope}" is not an allowed scope.\n => SCOPES: ${config['scopes'].join(', ')}`,
          commitSubject);
      return false;
    }
  
    return true;
  };
  
  function error(errorMessage, commitMessage) {
    console.error(`INVALID COMMIT MSG: "${commitMessage}"\n => ERROR: ${errorMessage}`);
  }
  