Reject value missing in AdminModuleOptions.auth.authenticate

[OoDeLally]

export interface AdminModuleOptions {
    adminBroOptions: AdminBroOptions;
    auth?: {
        authenticate: (email: string, password: string) => Promise<CurrentAdmin>; // here
        cookiePassword: string;
        cookieName: string;
    };
    formidableOptions?: ExpressFormidableOptions;
    sessionOptions?: SessionOptions;
}

There is no documented way to reject the authentication.

From a few issue discussions, I've seen empirically that return false is the way to reject the authentication.
Therefore the typing should be:

(email: string, password: string) => Promise<CurrentAdmin | false>

Throwing a JS error within the authenticate function would be preferable, but the promise rejection is not handled and crashes the server instead.