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