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In the repository, Microsoft stated:
If you are a developer looking to get started with developing apps for the HoloLens, you can start looking through the documentation available here. Microsoft has provided simple instructions that will help you get started but do keep in mind that you’ll require Visual Studio 2016 with Update 3 and the Microsoft HoloLens emulator to be able to use HoloJS. Once you have those installed and ready, you should be able to deploy and play around with the HoloJS sample from the GitHub repository.