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This looks really nice! I haven't understood why this pattern hasn't been the default all along. Singletons are not a pattern used very often in JS so I'm not sure why it caught on in Flux.

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Thanks! Yeah, I don't get it either. I think esamatti is exactly right: the original Facebook example used singletons and everyone followed their lead.

That, combined with the fact that all CommonJS modules are singletons, anyway.

All JavaScript modules are singletons regardless of the format. But it's still a very common practice to export a constructor function as the module's value and then to instantiate new instances. No idea why that hasn't been followed with React, but I imagine that you are correct about the Facebook example. They should have put more care into making it correct rather than just making it simple to explain.

Yep, that's what I was trying to say. The require cache makes the singleton pattern extra alluring, even in cases where you should avoid it.

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