In Magento 2, there's a mageUtils RequireJS module alias that points to mage/utils/main. If you look at the source of this module

#File: vendor/magento/magento2-base/lib/web/mage/utils/main.js

define(function (require) {
    'use strict';

    var utils = {},
        _ = require('underscore');

    return _.extend(

You can see this code directly calls require to pull in dependencies rather than listing them as define dependencies. I'd expect to see something more like this

        './template'], function (Arrays, Compare, Misc, Objects, Strings, Template) {
    'use strict';

    var utils = {},
        _ = require('underscore');

    return _.extend(
        utils, Arrays, Compare, Misc, Objects, Strings, Template

It's my understanding that directly calling require or requirejs to fetch a module reference only works if the module's already been loaded. Therefore, this means the mage/utils/main module can only be used if it's loaded in a particular order as part of the Magento bootstrap process.

  1. Is this an incorrect assumption about directly calling require?
  2. Is there a technical reason the mage/utils/main utility doesn't use define dependencies to pull these modules in?

1 Answer 1


This is "simplified CommonJS wrapping". A special form of RequireJS module declaration. In this case require calls are parsed by RequireJs and executed before this function is executed.

Some links:

We discourage it in new code

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