The vast majority of anything you'll ever need, even in absurdly complex scenarios, are built in. If you need to do something really wild and weird, the plugin

The vast majority of anything you'll ever need, even in absurdly complex scenarios, are built in. If you need to do something really wild and weird, the plugin and loader architecture will let you do pretty much anything and hook into nearly everything. We're dealing with a legacy environment here and we have a suite of plugins and loaders to handle non-standard module types, deal with files pulled from CDN at build time, deal with legacy Rails-style script imports, plugins to do all sort of bundle validation, splitting, transforming...really anything goes.