Optional externals

Hello,

I'm moving over my libraries to use webpack for a universal loader for the browser and Node.js. It's really great!

I have been scouring to find our how to make a dependency optional in webpack. Two cases:

jquery - it is optional on the server
stream (well, readable stream) - it is so large so I want it to be optional on the browser

If I require either, they get pulled into my build or if I use externals, they are added to the factory call like:

exports["kb"] = factory(require("underscore"), require("backbone"), require("moment"), require("stream"));

Is there a way to require these libraries in my library, but not make them a hard dependency?

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