JavaScript Javascript, solution needed for async issue

I do not know why you need the connect method , but here is one approach

export class WebsocketService {

  getSocket() {

    // this function should only return this.socket when it is available

    if (!this.socket || (this.socket && this.socket.disconnected)) {

      this.socket = new Promise((resolve, reject) => {

        const token = sessionStorage.getItem('token');
        const s = io('http://localhost:3000', { query: { token: token } });

        s.on('connect', () => {
          console.log(socket.connected); // true
          resolve(s);
        });

        s.on('disconnect', () => {
          console.log(socket.disconnect); // true
          reject(s);
        });
      });
    }

    return this.socket;
  }
}

Then, usage is:

service.getSocket().then(socket => {
    // Use the socket
});

Or with async/await:

const socket = await service.getSocket();
// Use the socket

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