Gulp pipe-able function for creating angular modules only when its not already created

gulp-angular-module-task.js

var through = require('through2');

var moduleWrapper = through.obj(function (chunk, enc, cb) {
  var content = chunk._contents.toString();
  var newContent = content.replace(/angular\s*\.\s*module\s*\(\s*['"]([^'"]+)['"]\s*,\s*\[([^\]]*)\][^)]*\)/mg, function(match, mod, deps) {  
    // ignore ngHtml2Js templates module name
    // if(mod === 'app.templates') { return match; }
    return "((function () {\n  try {\n    return angular.module('" + mod + "');\n  } catch (e) {\n    return angular.module('" + mod + "', [" + deps + "]);\n  }\n})())";
  });
  chunk._contents = new Buffer(newContent);
  cb(null, chunk);
});

Transform angular.module('module-name', [ 'dep1', 'dep2' ]) to

((function () {
  try {
    return angular.module('module-name');
  } catch (e) {
    return angular.module('module-name', ['dep1', 'dep2']);
  }
})())

Usage:

gulp.src(..)
  .pipe(..)
  .pipe(moduleWrapper)
  .dest(...);