refactor: add BetterAuthPlugin type to loginLink and tokenExchange functions

packages/db/src/auth/plugins/login-link.ts

@@ -1,5 +1,6 @@
 import * as schema from '@db/schema';
 
+import type { BetterAuthPlugin } from 'better-auth';
 import { createAuthEndpoint } from 'better-auth/api';
 import { setSessionCookie as _setSessionCookie } from 'better-auth/cookies';
 const setSessionCookie = _setSessionCookie as (
@@ -30,7 +31,7 @@ function getLoginLinkSecret(): Uint8Array {
   return new TextEncoder().encode(secret);
 }
 
-export function loginLink() {
+export function loginLink(): BetterAuthPlugin {
   return {
     id: 'login-link',
     endpoints: {

packages/db/src/auth/plugins/token-exchange.ts

@@ -1,5 +1,6 @@
 import * as schema from '@db/schema';
 
+import type { BetterAuthPlugin } from 'better-auth';
 import { createAuthEndpoint } from 'better-auth/api';
 // Session cookie helper: runtime accepts (ctx, { session, user }), typings show 1 arg
 import { setSessionCookie as _setSessionCookie } from 'better-auth/cookies';
@@ -21,7 +22,7 @@ function generateToken(): string {
   return Array.from(bytes, (b) => b.toString(16).padStart(2, '0')).join('');
 }
 
-export function tokenExchange() {
+export function tokenExchange(): BetterAuthPlugin {
   return {
     id: 'token-exchange',
     endpoints: {