I would like to cache the bundled of external modules files (i.e. node_modules) in the custom server to reduce for build time and deployment time.

but I'm not sure how to achieve those things?
e.g.
- how can I know what kinds of group of files should be cached. ( i think the extenral and internal modules are not explicitly seperated by default...)
- how can I know if the caches are invalidated or not.

Anyone knows any tips for this?