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Sord was originally developed to generate Sorbet type signature files from YARD comments. Sorbet is a type checking system developed by Stripe, and it does not use anything specific to Ruby 3 but is instead a custom DSL for defining types. However, Sord has recently been upgraded to support generation of RBS files (Ru*by **Signature*). This means that instead of having to write all your Ruby 3 type signature files by hand (which are standalone—Ruby 3 doesn't support inline typing in Ruby code itself), you can write YARD comments—just like with Solargraph—and autogenerate the signature files.
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Once you have those in place, you use a tool called Steep, which is the official type checker "blessed" by the Ruby core team. Steep evaluates your code against your signature files and provides a printout of all the errors and warnings (similar to any other type checker, TypeScript and beyond).
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Right now, I'm in the middle of an extensive overhaul of the Bridgetown project to add YARD documentation comments to all classes and methods. With the Solargraph gem + VSCode plugin installed, I get extensive type descriptions and code completion with a minimal amount of effort. If I were to type:
