4.5.3

Bug Fixes

• do not swallow user exceptions (2403b88)

Links:

• Diff: 4.5.2...4.5.3
• Server release: 4.5.3
• engine.io-client version: ~6.2.1
• ws version: ~8.2.3

Size of the bundles:

	min	min+gzip
socket.io.min.js	42.6 KB (-)	13.6 KB (-)
socket.io.msgpack.min.js	47.7 KB (-)	14.6 KB (-)
socket.io.esm.min.js	34.5 KB (-)	11.5 KB (-)

4.5.2

Bug Fixes

• handle ill-formatted packet from server (c597023)

Links:

• Diff: 4.5.1...4.5.2
• Server release: 4.5.2
• engine.io-client version: ~6.2.1 (diff)
• ws version: ~8.2.3

Size of the bundles:

	min	min+gzip
socket.io.min.js	42.6 KB (-)	13.6 KB (-)
socket.io.msgpack.min.js	47.7 KB (-)	14.6 KB (-)
socket.io.esm.min.js	34.5 KB (-)	11.5 KB (-)

2.5.0

Bug Fixes

• ensure buffered events are sent in order (991eb0b)

Links:

• Diff: 2.4.0...2.5.0
• Server release: 2.5.0
• engine.io-client version: ~3.5.0
• ws version: ~7.4.2

4.5.1

There were some minor bug fixes on the server side, which mandate a client bump.

Links:

• Diff: 4.5.0...4.5.1
• Server release: 4.5.1
• engine.io-client version: ~6.2.1 (diff)
• ws version: ~8.2.3

Size of the bundles:

	min	min+gzip
socket.io.min.js	42.6 KB (-)	13.6 KB (-)
socket.io.msgpack.min.js	47.7 KB (-)	14.6 KB (-)
socket.io.esm.min.js	34.5 KB (-)	11.5 KB (-)

4.5.0

Features

• add details to the disconnect event (b862924)

The "disconnect" event will now include additional details to help debugging if anything has gone wrong.

Example when a payload is over the maxHttpBufferSize value in HTTP long-polling mode:

socket.on("disconnect", (reason, details) => {
  console.log(reason); // "transport error"

  // in that case, details is an error object
  console.log(details.message); "xhr post error"
  console.log(details.description); // 413 (the HTTP status of the response)

  // details.context refers to the XMLHttpRequest object
  console.log(details.context.status); // 413
  console.log(details.context.responseText); // ""
});

• add support for catch-all listeners for outgoing packets (74e3e60)

This is similar to onAny(), but for outgoing packets.

Syntax:

socket.onAnyOutgoing((event, ...args) => {
  console.log(event);
});

• slice write buffer according to the maxPayload value (46fdc2f)

The server will now include a "maxPayload" field in the handshake details, allowing the clients to decide how many packets they have to send to stay under the maxHttpBufferSize value.

Links:

• Diff: 4.4.1...4.5.0
• Server release: 4.5.0
• engine.io-client version: ~6.2.1 (diff)
• ws version: ~8.2.3

Size of the bundles:

	min	min+gzip
socket.io.min.js	42.6 KB (+ 2.2 KB ⬆️)	13.6 KB (+ 0.5 KB ⬆️)
socket.io.msgpack.min.js	47.7 KB (+ 2.1 KB ⬆️)	14.6 KB (+ 0.4 KB ⬆️)
socket.io.esm.min.js	34.5 KB (+ 1.4 KB ⬆️)	11.5 KB (+ 0.2 KB ⬆️)

4.4.1

This release only contains minor changes. Please see the diff for more details.

Links:

• Diff: 4.4.0...4.4.1
• Server release: 4.4.1
• engine.io-client version: ~6.1.1
• ws version: ~8.2.3

Size of the bundles:

	min	min+gzip
socket.io.min.js	40.4 KB (-)	13.1 KB (-)
socket.io.msgpack.min.js	45.6 KB (-)	14.2 KB (-)
socket.io.esm.min.js	33.1 KB (-)	11.3 KB (-)

4.4.0

Bug Fixes

• add package name in nested package.json (53d8fca), closes socketio/socket.io-client#1513
• fix socket.disconnect().connect() usage (99c2cb8)
• prevent socket from reconnecting after middleware failure (d54d12c)

Features

• add timeout feature (ccf7998)

socket.timeout(5000).emit("my-event", (err) => {
  if (err) {
    // the server did not acknowledge the event in the given delay
  }
});

Links:

• Diff: 4.3.2...4.4.0
• Server release: 4.4.0
• engine.io-client version: ~6.1.1 (diff)
• ws version: ~8.2.3

Size of the bundles:

	min	min+gzip
socket.io.min.js	40.4 KB (+ 0.4 KB ⬆️)	13.1 KB (+ 0.1 KB ⬆️)
socket.io.msgpack.min.js	45.6 KB (+ 0.4 KB ⬆️)	14.2 KB (-)
socket.io.esm.min.js	33.1 KB (+ 0.3 KB ⬆️)	11.3 KB (+ 0.2 KB ⬆️)

4.3.2

Bug Fixes

• restore the default export (bis) (6780f29)

Links:

• Diff: 4.3.1...4.3.2
• Server release: -
• engine.io-client version: ~6.0.1
• ws version: ~8.2.3

Size of the bundles:

	min	min+gzip
socket.io.min.js	40.0 KB (-)	13.0 KB (-)
socket.io.msgpack.min.js	45.2 KB (-)	14.2 KB (-)
socket.io.esm.min.js	32.8 KB (-)	11.1 KB (-)

4.3.1

Bug Fixes

• restore the default export (f0aae84)
• restore the namespace export (8737d0a)

Links:

• Diff: 4.3.0...4.3.1
• Server release: -
• engine.io-client version: ~6.0.1
• ws version: ~8.2.3

Size of the bundles:

	min	min+gzip
socket.io.min.js	40.0 KB (+ 0.1 KB ⬆️)	13.0 KB (+ 0.1 KB ⬆️)
socket.io.msgpack.min.js	45.2 KB (+ 0.1 KB ⬆️)	14.2 KB (+ 0.1 KB ⬆️)
socket.io.esm.min.js	32.8 KB (+ 0.1 KB ⬆️)	11.1 KB (-)

4.3.0

An ESM bundle is now provided:

<script type="module">
  import { io } from "https://cdn.socket.io/4.3.0/socket.io.esm.min.js";

  const socket = io();

  socket.emit("hello", "world");
</script>

The bundle size has also been greatly reduced, from 16.0 KB to 12.9 KB (min+gzip).

Features

• typings: add missing types for some emitter methods (#1502) (a9e5b85)
• provide an ESM build with and without debug (16b6569)
• migrate to rollup (0661564)

Links:

• Diff: 4.2.0...4.3.0
• Server release: 4.3.0
• engine.io-client version: ~6.0.1 (diff)
• ws version: ~8.2.3 (diff)

Size of the bundles:

	min	min+gzip
socket.io.min.js	39.9 KB (-24.6 KB ⬇️)	12.9 KB (-3.1 KB ⬇️)
socket.io.msgpack.min.js	45.1 KB (-25.6 KB ⬇️)	14 KB (-2.6 KB ⬇️)
socket.io.esm.min.js	32.7 KB	11.1 KB