Can OAuth2Client.verifyIdToken() really return null?

[gitgrimbo]

The docs:

https://googleapis.github.io/google-auth-library-nodejs/classes/_auth_oauth2client_.oauth2client.html#verifyidtoken

say verifyIdToken() can return null in the returned Promise:

Promise<LoginTicket | null>

but that doesn't seem possible.

This is causing (incorrect?) warnings in my TypeScript project.

---

The method:

google-auth-library-nodejs/src/auth/oauth2client.ts

Line 832 in fba5662

verifyIdToken(options: VerifyIdTokenOptions): Promise<LoginTicket|null>;

supposedly can return null in the Promise.

The verifyIdToken() method calls:

google-auth-library-nodejs/src/auth/oauth2client.ts

Line 862 in fba5662

const login = this.verifySignedJwtWithCerts(

which calls the following code (JSDoc shown) (no mention of null in the JSDoc, and also seemingly no way for the method to return null):

google-auth-library-nodejs/src/auth/oauth2client.ts

Line 951 in fba5662

* @return Returns a LoginTicket on verification.

[JustinBeckwith]

Fair point! That should never return null. Fix is over at #488