existsByEmail 에서 Type '{_id: any; }' is not assignable to type 'boolean'. 에러 발생

async existsByEmail(email: string): Promise { try { const result = await this.catModel.exists({ email }); if (result) return true; else return false; } catch (error) { throw new HttpException('db error', 400); } }위와 같이 작성하세요