node-prune is a small tool to prune unnecessary files from ./node_modules, such as markdown, typescript source files, and so on.
$ go get github.com/tj/node-prune/cmd/node-prune
In your app directory:
$ node-prune
files total 27,330
files removed 3,990
size removed 13 MB
duration 200ms
Somewhere else:
$ node-prune path/to/node_modules
files total 27,330
files removed 3,990
size removed 13 MB
duration 200ms