将requireJS模块公开给全局名称空间的正确方法是什么？

Question

I want to expose a Javascript API as a standalone library without polluting their global namespace. I've created the wrapper so I don't pollute their own requireJS according to http://requirejs.org/docs/faq-advanced.html . I've simplified what I have so far as below, but I'm not sure if this is the correct way or if I should be doing it some other way.

var MyApi = MyApi || {};
var MyApiRequireJS = (function() {
  // require.js pasted here
  return {requirejs: requirejs, require: require, define: define};
})();

(function(require, define, requirejs) {
  require.config({
    baseUrl: 'js/scripts',
    waitSeconds: 30,
  });  

  define( 'myapi', ['jquery', 'underscore'],
    function($, _) {
      $.noConflict(true);
      _.noConflict();
      function api(method, args, callback) {
        // do stuff here
      }
      return {api: api};
    }
  );

  require( ['myapi'], function( myapi ) {
    MyApi = myapi;
  });
}(MyApiRequireJS.require, MyApiRequireJS.define, MyApiRequireJS.requirejs));

Sites using this library would include a script tag referencing the above code and then call the api using

MyApi.api('some_remote_method', {foo: 'bar'}, function(result) {
  // handle the result
});

Answer 1

I think you're trying to anticipate someone else's problem by making it your problem, but I don't think you can really reasonably do that. The page that you link to is designed to let people who already have Javascript globals named "require" or "define" rename the RequireJS globals to something different. It's not intended to create two separate RequireJS instances that independently resolve dependencies.

That said, if you are really trying to minimize the namespace pollution, then you should expose exactly one name -- MyApi. Write one monster closure that includes your private copy of RequireJS as well as your API code, and have it return only the methods you want to expose on your API.

It's probably much friendlier/simpler to deliver your API in two versions, one that defines a requireJS module, and one that has no requireJS dependency.