Node 16 support

When starting the emulator on NodeJS 16 there is an error thrown when initializing the app.

(node:31765) UnhandledPromiseRejectionWarning: Error: Credential implementation provided to initializeApp() via the "credential" property failed to fetch a valid Google OAuth2 access token with the following error: "Error fetching access token: Error while making request: getaddrinfo ENOTFOUND metadata.google.internal. Error code: ENOTFOUND".

This occurs when using an emulator start script with the following:

const admin = require('firebase-admin')
admin.initializeApp()

Should node 16 be working when starting the emulator?

[laurentpayot]

@Joebayld as a workaround you can force emulators to use another node version with the following npx command:

npx --package node@14.16.0 -- firebase emulators:start

(in the example above with node version 14.16, the same as the beta one used by functions, to avoid deployment surprises 😉 )

[lahirumaramba]

Closing due to inactivity. We can reopen later if you still run into this issue on the latest firebase-admin version.