void is not valid as a constituent in a union

[mfulton26]

react-oidc-context/src/AuthProvider.tsx

Line 42 in 8f5d9b4

onSigninCallback?: (user: User | void) => Promise<void> | void;

see no-invalid-void-type | typescript-eslint

I suggest using user: User | undefined or user?: User instead of user: User | void.