revert: feat: expose current offset to allow deduplication

This reverts commit 4e64123.

Using the id of the socket is not possible, since it is lost upon
reconnection (unless connection recovery is successful), so we revert
the previous change.

lib/socket.ts

@@ -217,22 +217,6 @@ export class Socket<
    * });
    */
   public connected: boolean = false;
-  /**
-   * The identifier of the current packet. Multiple retries of the same packet will have the same identifier, in order
-   * to allow deduplication (only process a packet once).
-   *
-   * @example
-   * io.on("connection", (socket) => {
-   *   socket.on("my-event", async (payload, callback) => {
-   *     const offset = socket.currentOffset;
-   *
-   *     await insertInDatabase(payload, offset);
-   *
-   *     callback();
-   *   })
-   * });
-   */
-  public currentOffset: string;
 
   /**
    * The session ID, which must not be shared (unlike {@link id}).
@@ -668,7 +652,6 @@ export class Socket<
     if (null != packet.id) {
       debug("attaching ack callback to event");
       args.push(this.ack(packet.id));
-      this.currentOffset = `${this.id}-${packet.id}`;
     }
 
     if (this._anyListeners && this._anyListeners.length) {

test/socket.ts

@@ -1105,28 +1105,4 @@ describe("socket", () => {
       socket3.on("disconnect", partialDone);
     });
   });
-
-  // TODO: enable once a new version of the socket.io-client package is released
-  // it("should retry with the same packet ID", (done) => {
-  //   const io = new Server(0);
-  //   let counter = 0;
-  //
-  //   io.on("connection", (socket) => {
-  //     socket.on("my-event", (cb) => {
-  //       expect(socket.currentOffset).to.eql(socket.id + "-0");
-  //       if (++counter === 3) {
-  //         cb();
-  //
-  //         success(done, io, clientSocket);
-  //       }
-  //     });
-  //   });
-  //
-  //   const clientSocket = createClient(io, "/", {
-  //     retries: 10,
-  //     ackTimeout: 20,
-  //   });
-  //
-  //   clientSocket.emit("my-event");
-  // });
 });