is it possible to change a environment variable in the worker?

  async fetch(request: Request) {
    await this.ensureMessagesInitialized();
    const webSocketPair = new WebSocketPair();
    const [client, server] = Object.values(webSocketPair);
    this.ctx.acceptWebSocket(server);
    return new Response(null, {
      status: 101,
      webSocket: client,
    });
  }

  async fetch(request: Request) {
    await this.ensureMessagesInitialized();
    const webSocketPair = new WebSocketPair();
    const [client, server] = Object.values(webSocketPair);
    this.ctx.acceptWebSocket(server);
    return new Response(null, {
      status: 101,
      webSocket: client,
    });
  }

async webSocketClose(
    ws: WebSocket,
    code: number,
    reason: string,
    wasClean: boolean,
  ) {
    // cleaning up storage if you want, or remove if you prefer not to delete
    await this.state.storage.deleteAll();
    ws.close(code, "durable object is closing websocket");
  }

async webSocketClose(
    ws: WebSocket,
    code: number,
    reason: string,
    wasClean: boolean,
  ) {
    // cleaning up storage if you want, or remove if you prefer not to delete
    await this.state.storage.deleteAll();
    ws.close(code, "durable object is closing websocket");
  }