Tackle Complexity in Typescript apps with TSMC (theblacksmithhq.com)

TSMC allows you to configure the modules and submodules (as well as their inner dependencies) you want to get out of your library/app and compile them giving you separately packaged modules and submodules.

Let's say you have a modals module, inside your ui namespace which is one of many namespaces inside your awesomejs lib. Driven by your config, tsmc will give you a awesomejs-ui-modals.js, an awesomejs-ui.js (which contains everything inside ui, including modals) and a awesomejs.js (which includes ui and everything else). For each package it will also give you a declaration (.d.ts) file and a sourcemap (.js.map) file. AFAIK, this is the best way available to have your source code compiled into a big combine package as well as fine grained modules.