We published three minor releases right after 1.4.0 addressing build issues in different environments.

• Socket.IO-client now includes the latest version of engine.io-client

• Fixed an issue that was preventing bundling with webpack.

• Socket.IO now adds support for NativeScript!

<script src="https://cdnjs.cloudflare.com/ajax/libs/socket.io/1.4.3/socket.io.min.js"></script>