What a silly statement and effectively just a long-winded, arrogant way of telling everyone you have no idea what you're talking about.

There are maybe a few cases where this makes sense and is possible, but there are things you can model with typescript which only make sense in typescript and simply don't have any overlap with what you are describing. You can't "restructure your JavaScript" to get static type safety and auto completion for nested object paths.

You can restructure your JS to avoid some crazy verbose TS though, sometimes. I think that's the point they were making. Why be so hostile?

I agree. The advanced stuff mostly exists in order to allow writing type annotations for JavaScript libraries that have APIs that are very dynamic.

If you're purely writing Typescript then you mostly don't need it.