Use RequireJS in your own extension 

To be able to use RequireJS at all, some prerequisites must be fulfilled:

• Your extension must have a Resources/Public/JavaScript directory. That directory is used for autoloading the modules stored in your extension.
• Each module has a namespace and a module name. The namespace is TYPO3/CMS/<EXTKEY>, <EXTKEY> is your extension key in UpperCamelCase, e.g. foo_bar = FooBar
• The namespace maps automatic to your Resources/Public/JavaScript directory
• The filename is the modulename + .js

Think about what's the purpose of the module. You can only write one module per file (anything else is bad practice anyway) A complete example: TYPO3/CMS/FooBar/MyMagicModule is resided in EXT:foo_bar/Resources/Public/JavaScript/MyMagicModule.js

Every AMD (Asynchronous Module Definition) is wrapped in the same construct:

define([], function() {
   // your module logic here
});

This is the "container" of the module. It holds the module logic and takes care of dependencies.

TYPO3 defines in its own modules an object to hold the module logic in properties and methods. The object has the same name as the module. In our case "MyMagicModule":

define([], function() {
   var MyMagicModule = {
      foo: 'bar'
   };

   MyMagicModule.init = function() {
     // do init stuff
   };

   // To let the module be a dependency of another module, we return our object
   return MyMagicModule;
});