Do you remember the "Smarter, Faster" concept for Ruby 4.0?

RuboCop now includes the built-in LSP as an experimental feature. This feature was essential to meet modern developer experience demands.

Ruby has some LSP implementations and among them, I will focus on the "Smarter, Faster" concept that RuboCop, the de facto standard Linter and Formatter, is aiming for.

Currently, RuboCop uses the Parser gem for Ruby syntax parsing. In addition to this, there is a plan to introduce the Prism Ruby parser as an experimental option. I will also talk about their purposes and designs.

RuboCop will enhance your developer experience by incorporating its built-in LSP. You can receive RuboCop in its current state and future vision.