Deploy to firebase functions

Today we'll learn how to deploy you node app to firebase functions. You can also use nodevader boilerplate to do this tutorial.

First, install the Firebase CLI if you don't have it.

npm install -g firebase-tools   

Then, run, login to your firebase account and init a project, right after choose option functions and connect it to your project

firebase login  
firebase init   

Now, you have a folder called functions.

Yes, delete it.

rm -rf functions    

Go to the firebase.json file and add the source property to functions, pointing to current directory:

{   
  "functions": {    
    "source": ".",  
    ... 
  }
}

Now install dependencies for firebase

npm install --save firebase-admin   
npm install --save firebase-functions   
npm install --save-dev firebase-functions-test  

and, add the required engine property to your package.json file

  { 
    ... 
    "engines": {    
      "node": "8"   
    }   
  } 

We're almost there. Go to your src/index.js file, remove app.listen(...)

// app.listen(...)  

And the last step. Add functions dependency and export the function.

const functions = require('firebase-functions') 
// your code here ...   
const api = functions.https.onRequest(app)  
module.exports = {  
  api   
}   

Now you can deploy your function to firebase

firebase deploy 

If you want to get the firebase CLI key for CI/CD. Run

firebase login:ci   

Thanks and Good luck.