jscriptcoder
10 verified skills
functional
Functional programming patterns with immutable data. Use when writing logic, data transformations, or encountering mutation bugs. Covers immutability violations catalog, pure functions, composition, early returns, and options objects. Do NOT over-apply heavy FP abstractions (monads, fp-ts) unless the project requires them.
development
react-testing
React component testing patterns including components, hooks, context, and forms. Covers Vitest Browser Mode with vitest-browser-react (preferred) and @testing-library/react. Use when testing React applications. For general UI testing patterns, see the front-end-testing skill.
development
tdd
Test-Driven Development workflow. Use for ALL code changes - features, bug fixes, refactoring. TDD is non-negotiable.
development
typescript-strict
TypeScript strict mode patterns including schema-first development, branded types, type vs interface guidance, and tsconfig strict flags. Use when writing TypeScript code, defining types or schemas, or reviewing type safety. For immutability and pure function patterns, see the functional skill.
development
expectations
Working expectations and documentation practices. Use when capturing learnings, documenting gotchas, recording architectural decisions, or understanding how to work with a codebase. Triggers on "document this", "remember this pattern", "what should I know about", or after completing significant features.
development
planning
Planning work in small, known-good increments. Use when starting significant work or breaking down complex tasks.
development
refactoring
Refactoring assessment and patterns. Use after mutation testing validates test strength (MUTATE phase) to assess improvement opportunities.
development
test-design-reviewer
Evaluates test quality using Dave Farley's 8 properties. Use when reviewing tests, assessing test suite quality, or analyzing test effectiveness against TDD best practices.
testing
testing
Testing patterns for behavior-driven tests. Use when writing tests, creating test factories, structuring test files, or deciding what to test. Do NOT use for UI-specific testing (see front-end-testing or react-testing skills).
development
mutation-testing
Mutation testing patterns for verifying test effectiveness. Use when analyzing branch code to find weak or missing tests.
development