Bug Fixes

• typings: add fallback to untyped event listener (#3834) (a11152f)
• typings: update return type from emit (#3843) (1a72ae4)

Links:

• Diff: https://github.com/socketio/socket.io/compare/4.0.0...4.0.1
• Client release: 4.0.1
• engine.io version: ~5.0.0
• ws version: ~7.4.2