ff-5mp-api-ts

Professional-grade ESLint development for JavaScript and TypeScript projects. Use when working with ESLint for (1) configuring ESLint in projects, (2) understanding or fixing ESLint errors and warnings, (3) creating or modifying ESLint rules, (4) integrating ESLint into build systems or editors, (5) migrating ESLint configurations, (6) setting up custom parsers or plugins, (7) troubleshooting ESLint issues, (8) implementing code quality standards, or (9) any task involving ESLint setup, configuration, or usage. Covers all ESLint versions with focus on v9+ flat config format.

Comprehensive JavaScript testing with Jest 30.0. Use when writing tests, debugging test failures, setting up Jest in projects, configuring test runners, mocking modules and functions, writing async tests, snapshot testing, framework integration with React or React Native, or any Jest-related task

Comprehensive Vitest testing framework skill for writing, configuring, and running tests in JavaScript/TypeScript projects. Use when Claude needs to: set up Vitest in a new or existing project (Vite or non-Vite), write or modify tests using Vitest APIs, configure Vitest for specific scenarios (coverage, browser testing, mocking, etc.), migrate from Jest or older Vitest versions, debug test failures or configuration issues, implement advanced testing patterns (workspace, browser mode, snapshots, mocking).