封装一个DTO

// response.dto.tsimport {CallHandler,ExecutionContext,Injectable,NestInterceptor,
} from "@nestjs/common";
import { FastifyReply } from "fastify";
import { Observable } from "rxjs";
import { map } from "rxjs/operators";
import { getReasonPhrase } from "http-status-codes";
import { instanceToPlain } from "class-transformer";function getCurrentTimestamp(): number {return Date.parse(new Date().toString()) / 1000;
}@Injectable()
export class TransformInterceptor implements NestInterceptor {intercept(context: ExecutionContext,next: CallHandler<any>): Observable<any> {// 获取Fastify的响应对象const response: FastifyReply = context.switchToHttp().getResponse<FastifyReply>();return next.handle().pipe(map((originalData: any) => {if (originalData &&originalData.code &&originalData.message &&"data" in originalData) {return originalData; // 如果是，直接返回}// 获取响应状态码const statusCode: number = response.statusCode;// 获取对应状态码的标准消息const message: string = getReasonPhrase(statusCode);// 构造标准响应格式return {code: statusCode,message: message,data: instanceToPlain(originalData) || null,timestamp: getCurrentTimestamp(),};}));}
}

在app.module中引入