socket.io-client 3.0.0

on Node.js NPM

More details about this release in the blog post: https://socket.io/blog/socket-io-3-release/

Dedicated migration guide: https://socket.io/docs/migrating-from-2-x-to-3-0/

Features

• emit an Error object upon middleware error (0939395)
• add bundle with msgpack parser (71d6048)
• add support for catch-all listeners (55f464f)
• add volatile events (7ddad2c)
• move binary detection back to the parser (1789094)
• add ES6 module export (cbabb03)
• do not reuse the Engine.IO id (bbe94ad)
• remove the implicit connection to the default namespace (249e0be)
• split the events of the Manager and Socket (132f8ec)
• throw upon reserved event names (6494f61)

BREAKING CHANGES

• the Socket instance will now emit a "connect_error" event instead of "error" (which is not a reserved event anymore)

// before
socket.on("error", () => {});

// after
socket.on("connect_error", () => {});

• the Socket#binary() method is removed, as this use case is now covered by the ability to provide your own parser.

• the Socket instance will no longer forward the events of its Manager

Those events can still be accessed on the Manager instance though:

socket.io.on("reconnect", () => {
  // ...
});

Links:

• Milestone: 3.0.0
• Diff: 2.3.1...3.0.0
• Server release: 3.0.0
• engine.io-client version: ~4.0.0
• ws version: ~7.2.1
• Build size
  • socket.io.min.js: 60.7 KB
  • socket.io.msgpack.min.js: 61.8 KB