brackets/atomのエクステンションの仕組み ref: http://qiita.com/noradaiko/items/a35d2b8191765a4e84e5

ExtensionLoader.js(169)

// Read optional requirejs-config.json
var promise = _mergeConfig(extensionConfig).then(function (mergedConfig) {
        // Create new RequireJS context and load extension entry point
        var extensionRequire = brackets.libRequire.config(mergedConfig),
                extensionRequireDeferred = new $.Deferred();

        contexts[name] = extensionRequire;
        extensionRequire([entryPoint], extensionRequireDeferred.resolve, extensionRequireDeferred.reject);

        return extensionRequireDeferred.promise();
}).then(function (module) {

file0.txt

/*jslint vars: true, plusplus: true, devel: true, nomen: true, regexp: true, indent: 4, maxerr: 50 */
/*global define, $, brackets, window */

/** Simple extension that adds a "File > Hello World" menu item */
define(function (require, exports, module) {
    "use strict";

    var CommandManager = brackets.getModule("command/CommandManager"),
        Menus          = brackets.getModule("command/Menus");


    // Function to run when the menu item is clicked
    function handleHelloWorld() {
        window.alert("Hello, world!");
    }


    // First, register a command - a UI-less object associating an id to a handler
    var MY_COMMAND_ID = "helloworld.sayhello";   // package-style naming to avoid collisions
    CommandManager.register("Hello World", MY_COMMAND_ID, handleHelloWorld);

    // Then create a menu item bound to the command
    // The label of the menu item is the name we gave the command (see above)
    var menu = Menus.getMenu(Menus.AppMenuBar.FILE_MENU);
    menu.addMenuItem(MY_COMMAND_ID);

    // We could also add a key binding at the same time:
    //menu.addMenuItem(MY_COMMAND_ID, "Ctrl-Alt-W");
    // (Note: "Ctrl" is automatically mapped to "Cmd" on Mac)
});

file1.txt

{
    "name": "fezvrasta.gist-manager",
    "title": "Gist Manager",
    "description": "Create and view Github Gists within Brackets. (View > Show Gists Manager)",
    "keywords": ["gist", "GitHub", "snippets"],
    "homepage": "https://github.com/FezVrasta/gist-manager",
    "version": "0.1.1",
    "author": "Fez Vrasta <info@mywebexpression.com> (http://www.mywebexpression.com)",
    "license": "MIT",
    "engines": {
        "brackets": ">=0.24.0"
    }
}

file4.txt

global.loadModule = function (name) {
  return require(name);
};

file5.txt

loadModule("util"); // -> Object {}

Global.js(114)

// Loading extensions requires creating new require.js contexts, which
// requires access to the global 'require' object that always gets hidden
// by the 'require' in the AMD wrapper. We store this in the brackets
// object here so that the ExtensionLoader doesn't have to have access to
// the global object.
global.brackets.libRequire = global.require;