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RBS, Ruby’s new type signature language

(developer.squareup.com)
511 points mootrichard | 1 comments | 29 Jul 20 18:04 UTC | HN request time: 0.212s | source
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muglug ◴[29 Jul 20 19:15 UTC] No.23990520[source]▶
Can someone explain why the types cannot live in Ruby code itself (after an appropriate version bump)?

Python 3 incorporated types into the language itself, in a similar way (though non-reified) to PHP. This seems much easier to deal with than requiring two files (.rb and .rbs) to describe a single data structure.

replies(4): >>23990918 #>>23990947 #>>23991201 #>>23991455 #
1. rattray ◴[29 Jul 20 20:49 UTC] No.23991455[source]▶
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.