Read document in Firestore from firebase onCall cloud function

Question

I am using an onCall firebase cloud function to check if a document exists in a collection on the firestore. If the document exists, i want to continue, if it still does not exist, than i want to create it.

I have tried many different things, but always got errors, so now i am trying to go step-by-step and simply get the content of a file i know exists on the collection. The collection is called "timeline_state" and the document is called "888"

const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp(functions.config().firebase);

exports.afterLogin = functions.https.onCall((data, context) => {
  console.log("afterLogin STARTING");

  const getDocument = admin.firestore().collection('timeline_state').doc('888').get();

  return getDocument.then(doc => {
    console.log(doc);
    return doc
  }).catch(error => {
    console.log(error)
    return error;
 })
})

When i call it from my code i get an empty data object, and in the Firebase functions log i see the function runs but i get an error:

/user_code/node_modules/firebase-admin/node_modules/gaxios/build/src/index.js:28
async function request(opts) {
      ^^^^^^^^

SyntaxError: Unexpected token function
    at createScript (vm.js:56:10)
    at Object.runInThisContext (vm.js:97:10)
    at Module._compile (module.js:549:28)
    at Object.Module._extensions..js (module.js:586:10)
    at Module.load (module.js:494:32)
    at tryModuleLoad (module.js:453:12)
    at Function.Module._load (module.js:445:3)
    at Module.require (module.js:504:17)
    at require (internal/module.js:20:19)
    at Object.<anonymous> (/user_code/node_modules/firebase-admin/node_modules/gcp-metadata/build/src/index.js:17:18)

Any ideas on what i am doing wrong, and maybe how i can fix it? Thanks!

Answer 1

My solution, thanks to a tip i got, was to update the node engine to 8.

To do so, i added the following to the package.json

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

Maybe this is helpful to someone else... ;)