Typing Role

I am using an enum from Prisma

but I cant pass that enum as a type for additional fields

  user: {
    additionalFields: {
      role: {
        type: "string",
        required: false,
        input: false,
      },
    },
  },

  user: {
    additionalFields: {
      role: {
        type: "string",
        required: false,
        input: false,
      },
    },
  },

  user: {
    additionalFields: {
      role: {
        type: "string",
        required: false,
        input: false,
      },
    },
  },

  user: {
    additionalFields: {
      role: {
        type: "string",
        required: false,
        input: false,
      },
    },
  },

(see image)

is there a way to have it typed as the values of my enum instead of as 'string' ?

KKHRM I am using an enum from Prisma but I cant pass that enum as a type for additio...

nikatune•4/12/25, 3:30 AM

probably no

KHRMOP•4/12/25, 3:37 AM

sometimes I forget simple solutions

import "server-only";

import { auth } from "@/lib/auth";
import { headers } from "next/headers";
import { Session, User } from "better-auth";
import { UserRole } from "@prisma/client";

type UserWithRole = Omit<User, "role"> & { role: UserRole };

export async function getAuthSession(): Promise<{
  session: Session;
  user: UserWithRole;
} | null> {
  const session = await auth.api.getSession({
    headers: await headers(),
  });
  return session as { session: Session; user: UserWithRole } | null;
}

import "server-only";

import { auth } from "@/lib/auth";
import { headers } from "next/headers";
import { Session, User } from "better-auth";
import { UserRole } from "@prisma/client";

type UserWithRole = Omit<User, "role"> & { role: UserRole };

export async function getAuthSession(): Promise<{
  session: Session;
  user: UserWithRole;
} | null> {
  const session = await auth.api.getSession({
    headers: await headers(),
  });
  return session as { session: Session; user: UserWithRole } | null;
}

nikatune•4/12/25, 3:39 AM

oh you mean this..

nikatune•4/12/25, 3:39 AM

role: {
type: roleEnum("admin"),
required: false,
input: false,
},

i thought u want something like this

KHRMOP•4/12/25, 3:40 AM

i did but its not valid better auth, so this wrapper is relatively safe since all types are directly from better auth except role

nikatune•4/12/25, 3:41 AM

yeah it must work good

nikatune•4/12/25, 3:41 AM

also make a function for client side

KHRMOP•4/12/25, 3:41 AM

oh good point!

Ping•4/13/25, 9:34 AM

@KHRM @rhitune auth client's useSession can be typed with the additionalFields plugin

Ping•4/13/25, 9:35 AM

https://www.better-auth.com/docs/concepts/typescript#inferring-additional-fields-on-client

TypeScript | Better Auth

Better Auth TypeScript integration.

PPing @KHRM @rhitune auth client's useSession can be typed with the additionalFields p...

KHRMOP•4/13/25, 5:14 PM

yes I have this setup, was trying to get to be more verbose on what literal strings a role can be i.e. 'user' , 'mod', 'admin'

import "server-only"; import { auth } from "@/lib/auth"; import { headers } from "next/headers"; import { Session, User } from "better-auth"; import { UserRole } from "@prisma/client"; type UserWithRole = Omit<User, "role"> & { role: UserRole }; export async function getAuthSession(): Promise<{ session: Session; user: UserWithRole; } | null> { const session = await auth.api.getSession({ headers: await headers(), }); return session as { session: Session; user: UserWithRole } | null; }

Typing Role

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