READ THIS: DOWNGRADING TO @firebase/auth@0.17.1 fixed the problem.
Operating System version: macOS 10.15.2
in my package.json:
"@firebase/auth": "^0.19.5",
./src/components/app/login/login.component.ts:18:0-108 - Error: Module not found: Error: Package path ./cordova is not exported from package /Users/me/project/node_modules/@firebase/auth (see exports field in /Users/me/project/node_modules/@firebase/auth/package.json)
Import code:
import {
getRedirectResult,
signInWithRedirect,
getAuth,
GoogleAuthProvider,
} from '@firebase/auth/cordova';