function installExampleAngular()

in gulpfile.js [500:540]

• 36 lines of code
• 8 McCabe index (conditional complexity)

function installExampleAngular() {
  var sources;
  var template;
  var libs = [
    'core', 'common', 'compiler', 'compiler-cli',
    'platform-browser', 'platform-browser-dynamic', 'platform-server',
    'forms', 'http', 'router', 'upgrade'];

  var build = argv.build;
  if (build) {
    if (typeof build === 'string') {
      build = (build[0]==='#' ? '' : '#') + build;
    } else {
      build = '';
    }
  } else{
    build = 'npm';
  }
  // Like: "angular/core-builds" or "@angular/core"
  sources = libs.map( lib => {
    return build === 'npm'
      ? `@angular/${lib}`
      : `git+https://github.com/angular/${lib}-builds${build}`;
  });

  if (argv.build) { 
    sources.push('@angular/tsc-wrapped'); // tsc-wrapped needed for builds
    sources.push('typescript@2.2.1');     // recent builds need recent TypeScript
  } 

  sources.push('@angular/router-deprecated');

  gutil.log(`Installing Angular packages from ${build === 'npm' ? 'NPM' : 'BUILD ' + build}`);

  var spawnInfo = spawnExt('node', ['node_modules/rimraf/bin.js', 'node_modules/@angular'], { cwd: EXAMPLES_PATH});
  return spawnInfo.promise
    .then(() =>  {
      spawnInfo = spawnExt('npm', ['install', ...sources], {cwd: EXAMPLES_PATH});
      return spawnInfo.promise
    });
}