The major bump is due to some breaking changes on the server side.
Blog post: https://socket.io/blog/socket-io-4-release/
Bug Fixes
- bundle: restore support for JS modules (43613d1)
Features
Links:
- Diff: 3.1.2...4.0.0
- Server release: 4.0.0
- engine.io-client version:
~5.0.0
- ws version:
~7.4.2
- Build size
socket.io.min.js
:62.8 KB (+ 2.5 KB)
socket.io.msgpack.min.js
:63.9 KB (+2.6 KB)