4.2.0

Bug Fixes

• typings: allow async listener in typed events (ccfd8ca)

Features

• ignore the query string when serving client JavaScript (#4024) (24fee27)

Links:

• Diff: 4.1.3...4.2.0
• Client release: 4.2.0
• engine.io version: ~5.2.0
• ws version: ~7.4.2

4.1.3

Bug Fixes

• fix io.except() method (94e27cd)
• remove x-sourcemap header (a4dffc6)

Links:

• Diff: 4.1.2...4.1.3
• Client release: 4.1.3
• engine.io version: ~5.1.0
• ws version: ~7.4.2

4.1.2

Bug Fixes

• typings: ensure compatibility with TypeScript 3.x (0cb6ac9)
• ensure compatibility with previous versions of the adapter (a2cf248)

Links:

• Diff: 4.1.1...4.1.2
• Client release: 4.1.2
• engine.io version: ~5.1.0
• ws version: ~7.4.2

4.1.1

Bug Fixes

• typings: properly type server-side events (b84ed1e)
• typings: properly type the adapter attribute (891b187)

Links:

• Diff: 4.1.0...4.1.1
• Client release: 4.1.1
• engine.io version: ~5.1.0
• ws version: ~7.4.2

4.1.0

Blog post: https://socket.io/blog/socket-io-4-1-0/

Features

• add support for inter-server communication (93cce05)
• notify upon namespace creation (499c892)
• add a "connection_error" event (7096e98, from engine.io)
• add the "initial_headers" and "headers" events (2527543, from engine.io)

Links:

• Diff: 4.0.2...4.1.0
• Client release: 4.1.0
• engine.io version: ~5.1.0
• ws version: ~7.4.2

4.0.2

Bug Fixes

• typings: make "engine" attribute public (b81ce4c)
• properly export the Socket class (d65b6ee)

Links:

• Diff: 4.0.1...4.0.2
• Client release: 4.0.2
• engine.io version: ~5.0.0
• ws version: ~7.4.2

4.0.1

Bug Fixes

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

Links:

• Diff: 4.0.0...4.0.1
• Client release: 4.0.1
• engine.io version: ~5.0.0
• ws version: ~7.4.2

4.0.0

Blog post: https://socket.io/blog/socket-io-4-release/
Migration guide: https://socket.io/docs/v3/migrating-from-3-x-to-4-0/

Bug Fixes

• make io.to(...) immutable (ac9e8ca)

Features

• add some utility methods (b25495c)
• add support for typed events (#3822) (0107510)
• allow to exclude specific rooms when broadcasting (#3789) (7de2e87)
• allow to pass an array to io.to(...) (085d1de)

BREAKING CHANGES

• io.to(...) now returns an immutable operator

Previously, broadcasting to a given room (by calling io.to()) would mutate the io instance, which could lead to surprising behaviors, like:

io.to("room1");
io.to("room2").emit(/* ... */); // also sent to room1

// or with async/await
io.to("room3").emit("details", await fetchDetails()); // random behavior: maybe in room3, maybe to all clients

Calling io.to() (or any other broadcast modifier) will now return an immutable instance.

Links:

• Diff: 3.1.2...4.0.0
• Client release: 4.0.0
• engine.io version: ~5.0.0
• ws version: ~7.4.2

3.1.2

Bug Fixes

• ignore packets received after disconnection (494c64e)

Links:

• Diff: 3.1.1...3.1.2
• Client release: 3.1.2
• engine.io version: ~4.1.0
• ws version: ~7.4.2

3.1.1

Bug Fixes

• properly parse the CONNECT packet in v2 compatibility mode (6f4bd7f)
• typings: add return types and general-case overload signatures (#3776) (9e8f288)
• typings: update the types of "query", "auth" and "headers" (4f2e9a7)

Links:

• Diff: 3.1.0...3.1.1
• Client release: 3.1.1
• engine.io version: ~4.1.0
• ws version: ~7.4.2