What Does Tensorflow.js Use fbjs For?

I was looking over the Tensorflow.js dependencies and noticed that fbjs is included in the dependency list. What functionality requires fbjs? I'm not familiar with the package, but I'm aware that it is a Facebook JavaScript package. It just seems a little strange to me, but as I said, I don't know much about fbjs so maybe there's something useful in the context of Tensorflow.js.

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