RuboCop 1.89 is out, and it comes with the usual assortment of new cops and bug fixes. But there’s one theme running through this release that I’m particularly excited about, and that’s what I want to talk about today: RuboCop is finally learning to look beyond a single file.

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RuboCop 1.89 introduces project-wide analysis via optional integration with rubydex, a Shopify library that builds a cross-file index of Ruby code. Previously limited to single-file analysis, RuboCop can now detect typos in constant/method names across files (Lint/NameTypo), flag deprecated API usage project-wide (Lint/DeprecatedReference), find unused private methods (Lint/UnusedPrivateMethod), and catch duplicate methods or constant reassignments across different files. Existing cops like Lint/MissingSuper and Lint/ConstantResolution also become significantly less noisy with full ancestry resolution. Rubydex is opt-in, requiring two config changes, and falls back gracefully if not installed. A new option to index gem sources raises ancestry resolution from ~20% to ~97% of classes.

RuboCop 1.89: Project-Wide Analysis with Rubydex