TypeScript - Extend hook type

[flacial]

The hook useSession returns an object that has a data property. The data property type only has the email, username, and image. Our user object has more than these types. I would like to extend the default useSession data type and I don't know how.

useSession type:

export declare type SessionContextValue<R extends boolean = false> = R extends true ? {
    data: Session;
    status: "authenticated";
} | {
    data: null;
    status: "loading";
} : {
    data: Session;
    status: "authenticated";
} | {
    data: null;
    status: "unauthenticated" | "loading";
};

data or Session type:

export interface Session extends Record<string, unknown>, DefaultSession {
}

DefaultSession type:

export interface DefaultSession extends Record<string, unknown> {
    user?: {
        name?: string | null;
        email?: string | null;
        image?: string | null;
    };
    expires: ISODateString;
}

[flacial]

This worked but we'll have to specify the type every time:

interface Session extends DefaultSession {
  lessonStatus: {
    starGiven: string
    passedAt: Date | null
    lessonId: number
  }[]
  user: {
    id: number
    username: string
    name: string
    isAdmin: boolean
    isConnectedToDiscord: boolean
  }
  submissions: Submission[]
}

export declare type SessionContext<R extends boolean = false> = R extends true
  ?
      | {
          data: Session
          status: 'authenticated'
        }
      | {
          data: null
          status: 'loading'
        }
  :
      | {
          data: Session
          status: 'authenticated'
        }
      | {
          data: null
          status: 'unauthenticated' | 'loading'
        }