I wonder what percentage of TypeScript users write their types inline, and what percentage of users choose to write separate .d.ts files for each of their sourc

I wonder what percentage of TypeScript users write their types inline, and what percentage of users choose to write separate .d.ts files for each of their source files. My guess is the latter is vanishingly small – that it's pretty much only done for libraries that were written before TS was a thing – so I wonder how things will go in Ruby. Maybe everybody will just standardize on third-party tools like Sorbet which allow inline typedefs, or use types a lot less, or hook up a "regenerate inferred .rbs on save" workflow in their editor, or just switch between files a lot.