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Socket.io v4.5.0 Release Notes

Release Date: 2022-04-23 // almost 2 years ago

  • 🐛 Bug Fixes

    • typings: ensure compatibility with TypeScript 3.x (#4259) (02c87a8)

    🔋 Features

    • ➕ add support for catch-all listeners for outgoing packets (531104d)

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

    Syntax:

    socket.onAnyOutgoing((event, ...args) => {
  console.log(event);
});
    • broadcast and expect multiple acks (8b20457)

    Syntax:

    io.timeout(1000).emit("some-event", (err, responses) => {
  // ...
});
    • ➕ add the "maxPayload" field in the handshake details (088dcb4)

    So that clients in HTTP long-polling can decide how many packets they have to send to stay under the maxHttpBufferSize value.

    This is a backward compatible change which should not mandate a new major revision of the protocol (we stay in v4), as we only add a field in the JSON-encoded handshake data:

    0{"sid":"lv_VI97HAXpY6yYWAAAC","upgrades":["websocket"],"pingInterval":25000,"pingTimeout":5000,"maxPayload":1000000}