why is socket.io a devDependency?

[tjwebb]

https://github.com/Automattic/wp-calypso/blob/master/package.json#L127

It seems unlikely to me that this is correct

[Tug]

Socket.io is not used on WordPress.com in production, only in development for hot reloading of our modules bundled with Webpack.
If you are interested, I believe our integration is based on https://github.com/webpack/webpack-dev-server

[nb]

We’re not using the server for the bundling in development, but the middleware.

As for socket.io, @Tug is right, it’s used in the hot reloading parts of the dev environment.