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

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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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