在socket.io-client中调用IO时出错，角度为8 [英] Getting error while calling IO in socket.io-client, angular 8

问题描述

我正在如下所示的角度项目中调用socket.io-client的IO:

I am calling IO of socket.io-client in my angular project like below:

import { Injectable } from '@angular/core';
import { Observable } from 'rxjs/internal/Observable';
import * as io from 'socket.io-client';
@Injectable({
  providedIn: 'root'
})
export class SocketclientService {
  socket:any;
  url:any="ws://localhost:8080"
  constructor() {
    this.socket = io(this.url);
   }
   
   listen(eventname:any,data:any){
     return new Observable((subscriber)=>{
       this.socket.on(eventname,(data:any)=>{
         subscriber.next(data);
       })
     })
   }
   emit(eventname:string,data:any){
     this.socket.emit(eventname,data);
   } 
}

但是我总是收到类似这样的错误:

But I am always getting an error like:

 Error: src/app/services/socketclient.service.ts:11:19 - error TS2349: This expression is not callable.
      Type 'typeof import("C:/somepathtoproject/node_modules/socket.io-client/build/index")' has no call signatures.
    
    11     this.socket = io(this.url);
                         ~~

即使我已经安装了@ types/socket.io-client

I am not getting it why this is showing, even I have installed @types/socket.io-client

推荐答案

在角度10中效果很好:

In angular 10 works fine:

import {io} from 'socket.io-client';

这是官方文档 https://socket.io/docs/v3/client-api/index.html

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