Use http://json2ts.com/ instead.
This was a StackBlitz experiment but I do plan to build a usable tool that will convert json to a single typescript interface
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Do checkout StackBlitz. I stopped using it when my browser crashed and I lost work, but it's increadible. StackBlitz also has mime-type issues when working outside the main folder, so bin/index.js does not work. It also failed to load css with mime-type issues. But it's going to be incredible.