Who can help with npm, gulp and webpack error?

Question

npm

I'm trying to run one template through webpack:
I get this error:

webpack is watching the files…

 ERROR  Failed to compile with 16 errors                              4:54:57 PM

These dependencies were not found:

* child_process in ./node_modules/opn/index.js
* fs in ./node_modules/chokidar/index.js, ./node_modules/chokidar/lib/nodefs-handler.js and 13 others

To install them, you can run: npm install --save child_process fs
Entrypoint app [big] = runtime.js vendors~app.js app.js

child_process, fs installed, but does not help:
npm install --save child_process fs