undefined is not a function (evaluating '_iterator2[typeof Symbol === "function"

Question

I am implementing firebase with react native, here are the versions i am working with

"firebase": "^5.4.1",
"react-native": "0.56.0",
"react": "16.4.1",

But when i import firebase, it is showing following error :

undefined is not a function (evaluating '_iterator2[typeof Symbol === "function" ? Symbol.iterator : "@@iterator"]()')

Note : Getting this error only on Android device, on iOS it is working perfect.

Answer 1

I had the same issue when importing firebase and found the solution here

Add this in your index.js

// index.js
global.Symbol = require('core-js/es6/symbol');
require('core-js/fn/symbol/iterator');
require('core-js/fn/map');
require('core-js/fn/set');
require('core-js/fn/array/find');

The way I see it is that there are certain JS syntaxes that doesn't translate well for android to understand.