There are JavaScript APIs in the loader you can call directly, but they will be asynchronously loaded and executed (so you'll need to pass in a callback)

Basically the only way to get this asynchronously loading / synchronously executing behavior is to statically analyze your "root" module for dependencies and load them (and their dependencies, etc). Once they're all loaded you can begin execution and synchronously execute every module as they're imported.

FYI CommonJS (not AMD) loaders for the browser do the same thing to avoid synchronous XHRs that will cause the UI to hang.

You can still import things conditionally (its treated as a statement), the only real restriction is that the filename is expected to be a static string, so the for loop thing wouldn't work. However, the "guts" of the import statement are also provided to you as a function that you can just call with anything, so you could still have for (;blah;) objj_import(filenames[i], callback) for these kinds of cases.