
Code formatting and style rules not handled by auto-formatters (Biome/Prettier). Use when writing or modifying code files. Covers function declarations, exports, types, comments, JSX, and naming conventions.
Guide for writing comprehensive, well-structured tests with full coverage. Use when creating test files, adding tests to existing files, reviewing test coverage, or when asked to write, fix, or expand tests. Covers test organization (flat vs nested), coverage categories (happy/sad/edge), .todo patterns for planned tests, and formatting conventions.