typescript - socket.io-redis typescript 错误

Question

我试过像这样使用 @types/socket.io-redis:

import { Server as HttpServer } from 'http';
import socketIo, { Socket } from 'socket.io';
import redis, { RedisAdapter } from 'socket.io-redis';

export default function setupWebsocket(server: HttpServer) {
    const io = socketIo().listen(server);
    io.adapter(redis(process.env.REDIS_URL));

    const adapter: RedisAdapter = io.of('/').adapter;    // Error here
}

在Error here 注释所在的部分，我在 adapter 变量处得到了一条红色下划线，其中有错误:

Type 'Adapter' is not assignable to type 'RedisAdapter'.

Property 'uid' is missing in type 'Adapter'.

谁能帮我解决这个问题？我对 Typescript 很陌生

Answer 1

这是正确的行为，类型为 io.of('/').adapter是Adapter .事实上，您分配了接口(interface)(RedisAdapter)的特定实现(Adapter)不会更改属性类型，因为稍后您可能会更改为不同的实现Adapter .

可能的解决方案可能是在创建后直接分配适配器

import { Server as HttpServer } from 'http';
import socketIo, { Socket } from 'socket.io';
import redis, { RedisAdapter } from 'socket.io-redis';

export default function setupWebsocket(server: HttpServer) {
    const io = socketIo().listen(server);
    const adapter: RedisAdapter = redis(process.env.REDIS_URL);
    io.adapter(adapter);
    //... more code here
}

其他解决方案是转换为所需的类型

const adapter: RedisAdapter = io.of('/').adapter as RedisAdapter;