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I could imagine working on very complex static JSON. You want to type-check selections and transformations on this JSON.

It's a very niche use-case, this is definitely more of an impressive showcase of the new Template Literal Types feature of TS :)

You can import a json document directly into typescript and the entire document is a readonly constant type of the entire json object literal.

I've used this with a template JSON document that has an instance of all possible types in the runtime json.

Sometimes you might have to loosen the type slightly, but it works great for a quick start.