Even with a timeout of 0, the 'open' event was emitted before the
timeout was reached, so the tests would randomly fail in the CI.

Subscribing/unsubscribing for a lot of different event types could lead
to a memory leak.

See sindresorhus/component-emitter@aa2e57a

Diff: sindresorhus/component-emitter@1.2.1...1.3.0

Following previous commit, the lock file was not up-to-date.

- base64-arraybuffer => dev
- has-cors => dev
- object-component => removed

The newer versions need to be transpiled to ES5, so we'll rollback for
now as it breaks IE11.

We'll have to find a way to provide the users who bundle the Engine.IO
(or Socket.IO) client (with webpack for example) with a source code
which does not include debug (or document the usage of
webpack-remove-debug [1]).

[1] https://github.com/johngodley/webpack-remove-debug

Closes socketio/socket.io#3358

It was included by the previous commit, but the test code is not
currently transpiled to ES5 so it breaks IE in the CI.

Let's use a plain function for now.

Diff:

- socketio/engine.io-parser@2.2.0...2.2.1
- socketio/socket.io-parser@3.3.0...3.3.1

Related:

- #1376
- #1234

Diff: 2.3.0...2.3.1