/**
 * Create a Supabase Edge Function handler for retrieving custom claims (app_metadata).
 *
 * @returns `(req: Request) => Promise<Response>` handler
 *
 * @example
 * ```typescript
 * // supabase/functions/get-custom-claims/index.ts
 * import { createGetCustomClaims } from '@donotdev/functions/supabase';
 * Deno.serve(createGetCustomClaims());
 * ```
 *
 * @version 0.1.0
 * @since 0.6.0
 */
export declare function createGetCustomClaims(): (req: Request) => Promise<Response>;
