Firebase Cloud Functions Setup How to setup a Firebase Cloud Functions environment with TypeScript

Installation and setup is identical for Mac, Windows, and Linux. The only requirement is NodeJS which is likely available on your system, but if not, install NVM https://github.com/nvm-sh/nvm.

Install Node

Cloud functions in either Node 6 or 8, so it is recommended that you setup your local env with. For example, with NVM

command line 
nvm install 8
nvm use 8

Setup Cloud Functions

command line 
npm install firebase-tools -g

firebase login

firebase init functions

cd functions

### Common Issue on Windows Incorrect environment path on windows https://github.com/firebase/firebase-tools/issues/610
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