issue # nestjs 로 초기화

src/modules/account/account.service.ts

@@ -0,0 +1,15 @@
+import { Injectable } from "@nestjs/common";
+import { AccountRepo } from "./account.repo";
+import { CheckDuplicationRequestDto } from "./dto/checkDuplication/check-duplication-request.dto";
+import { CheckDuplicationResponseDto } from "./dto/checkDuplication/check-duplication-response.dto";
+
+@Injectable()
+export class AccountService {
+  constructor(private readonly accountRepo: AccountRepo) {}
+
+  async checkDuplication(data: CheckDuplicationRequestDto): Promise<CheckDuplicationResponseDto> {
+    const count = await this.accountRepo.checkDuplication(data.type, data.value);
+
+    return { isDuplicated: count > 0 };
+  }
+}