mutation-testing
Mutation Testing
Mutation testing answers: "Would my tests catch this bug?" by actually introducing bugs and running tests.
Execution Workflow
CRITICAL: This skill actually mutates code and runs tests. Follow this exact process:
Step 1: Identify Target Code
# Get changed files on the branch
git diff main...HEAD --name-only | grep -E '\.(ts|js|tsx|jsx|vue)$' | grep -v '\.test\.' | grep -v '\.spec\.'
Step 2: For Each Function to Test
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Write high-quality Vue 3 composables following established patterns and best practices. Use when creating new composables, refactoring existing ones, or reviewing composable code. Triggers include requests to "create a composable", "write a use* function", "extract logic into a composable", or any Vue Composition API reusable logic task.
23product-planning
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19vitest-mocking
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15add-exercises
Add new exercises to the workout tracker database. Use when asked to add exercises, expand the exercise library, or check what exercises exist. Triggers include "add exercise", "new exercise", "exercise database", "what exercises", "missing exercises", "expand exercises".
12systematic-debugging
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12repository-pattern
Create and manage Dexie/IndexedDB repositories with type-safe interfaces, converters, and standardized CRUD operations. Use when (1) adding entity storage, (2) implementing save/load/delete operations, (3) designing database schema and indexes, (4) converting between database (Db*) and domain types, (5) handling database errors or migrations, (6) using existing repositories (SettingsRepository, WorkoutsRepository, TemplatesRepository, CustomExercisesRepository, BenchmarksRepository, ActiveWorkoutRepository). Triggers include "database", "repository", "save data", "fetch from database", "delete from storage", "database schema", "database table", "indexes", "migration", "persist", "convert workout", "converter", "buildPartialUpdate", "mock repository", "database error", "bulk operations", "import/export", or specific repository names.
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