If you link your project to github and set up
push-to-deploy (or just
link the repository, leaving deployment as a separate step), you'll be able to browse your source code through the Developers Console. If you set up your
static file handlers (or create a dynamic file server handler on the same route, /js/gitp.js) you'll be able to access the gitp.js file at the route /js/. The two are separate-but-related ways to access/view the file.
I hope this has helped answer your question. Let me know if you have any issues and I'll be glad to help.
Best wishes,