borisyankov/DefinitelyTyped — pull request #1165 by duncanmak (2013-10-22 15:28:16+00:00)
Title: Update signatures for EventEmitter.

* Allow for method chaining in addListener/removeListener, on/once,
and removeAllListeners.

* Fix return type for 'emit'.

This patch mirrors the changes made to the API docs in this commit:
https://github.com/joyent/node/commit/41cbdc5e64d090e0708dd2a63d4cd63000019bb1