ruby-conventions

name	ruby-conventions
description	Ruby code conventions covering Ruby 3.2+, RuboCop, RBS type checking, RSpec/Minitest, security scanning, exception handling, composition, Bundler, and gem packaging. Load when writing or reviewing Ruby code.

• Ruby 3.2+, frozen_string_literal: true, .ruby-version file.
• Linting: a linter/formatter (e.g., RuboCop) with auto-fix (120 char max), plus its RSpec/performance plugins.
• Type checking: RBS with a type checker (e.g., steep). Use rbs prototype for scaffolding type signatures.
• Testing: RSpec (or Minitest) with describe/context/it, factories over fixtures, a coverage tool (e.g., SimpleCov) at 80%+.
• Security: a SAST tool (e.g., Brakeman for Rails), bundler-audit for dependency CVE scanning.
• Error handling: specific exceptions inheriting StandardError, no bare rescue.
• Composition over inheritance, Comparable/Enumerable mixins, case/in pattern matching.
• Dependencies: bundler, commit Gemfile.lock, pessimistic ~> constraints.
• Gem packaging: use gemspec with bundler gem template, rake release for distribution.
• &:method_name block shorthand, => pattern matching destructuring (3.2+).
• Anti-patterns: monkey patching, method_missing without respond_to_missing?, eval with user input.