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You're getting in the realm of "projectional editing." It's a fascinating idea: https://news.ycombinator.com/item?id=15534555

Yep. You can take MPS today and implement an AST projection that looks like whatever you want. No parsing involved, impossible to even write syntactically invalid code (since it is not code you're writing, but an AST projection).

I love reading about stuff like this, thanks for sharing. Developer UX still has a lot of room to grow.

Interesting. I sometimes wish to only see the types and get rid of the rest.

What about instead maintaining the type definitions in a separate file, and then having the editor add in the type hinting?