node.js - Fastify Typescript 请求查询

Question

我正在尝试按照此处的 Fastify with Typescript 文档组合一个简单的端点:
https://www.fastify.io/docs/v3.1.x/TypeScript/

export default async function foo(fastify: any) {
       const MyInstance = new Foo(fastify.db);
       app.get<{ Querystring: IQueryString, Headers: IHeaders }>(
           "/foo",
           async (request: FastifyRequest, reply: FastifyReply) => {
              console.log(request.query); // *prints query object*
              const { queryObj } = request.query; // *Gives error: Object is of type 'unknown'*
              const result = await MyInstance.getFoo(queryObj);
              reply.status(200).send(result);
           }
       );
   }

为什么我在尝试访问 request.query 时会收到错误消息对象以及如何修复它？

Answer 1

默认 FastifyRequest.query的类型 RequestQuerystringDefault映射到 unknown因为人们无法猜测您要为其设置哪些属性/类型。
您是否应该为 query 定义类型一些请求，只需定义 request type并使用它:

type MyRequest = FastifyRequest<{
  Querystring: { queryObj: MyQueryObject }
}>

然后将其指定为预期的请求类型:

 async (request: MyRequest, reply: FastifyReply) => {
   const { queryObj } = request.query // Ok
 }