ccfg-typescript

Autonomous per-file test coverage improvement loop

Initialize new TypeScript project with strict, production-ready defaults

Run TypeScript quality gates - typecheck, lint, test, format

Use for Angular 17+ applications with signals, standalone components, RxJS operators, and NgRx state management. Examples: migrating from NgModules to standalone components, implementing signal-based reactivity, designing lazy-loaded feature modules with loadComponent, building NgRx stores with effects and selectors, composing complex RxJS operator chains.

Use for Next.js 14+ development with App Router, server actions, ISR, middleware, and deployment. Examples: implementing server actions for form mutations, configuring ISR with on-demand revalidation, building API routes with route handlers, creating middleware chains for auth and localization, optimizing images and fonts.

Use for building Node.js backends with Express, Fastify, or NestJS, including REST/GraphQL APIs, middleware architecture, authentication, and database integration. Examples: creating REST APIs with Fastify and type-safe validation, implementing JWT authentication, integrating Prisma for database access, building NestJS module architecture.

Use for npm package development, monorepo management, bundling, and publishing workflows. Examples: setting up pnpm workspace with multiple packages, configuring tsup for dual CJS/ESM output, publishing scoped packages to npm, managing monorepo dependencies with Turborepo or Nx, configuring changesets.

Use for React 18+ development with modern hooks, server components, Suspense, and performance optimization. Examples: building complex form components with react-hook-form and zod, optimizing re-renders with useMemo and useCallback, implementing server component patterns, integrating Zustand or Jotai for state management.

Use for Svelte 5 applications with runes, SvelteKit routing, server-side rendering, and form actions. Examples: building reactive UI with $state and $derived runes, implementing SvelteKit pages and layouts, creating server load functions, handling form actions with progressive enhancement, building API routes.

Use for modern TypeScript 5+ development with advanced type system features, complex generics, utility types, and module systems. Examples: designing type-safe APIs with conditional types, implementing complex generic constraints, building branded types for domain modeling, creating template literal types for string validation.

Use for testing TypeScript and React applications with Vitest, React Testing Library, msw for API mocking, and Playwright for E2E testing. Examples: writing component tests with user events, mocking API endpoints with msw handlers, testing async behavior with waitFor, setting up Playwright E2E tests, improving test coverage.

Use for Vue 3 applications with Composition API, Pinia state management, Nuxt 3 server features, and reactive SFC patterns. Examples: building reusable composables, designing Pinia stores with TypeScript, implementing Nuxt server routes and middleware, creating typed components with defineProps and defineEmits, implementing VueUse utilities.

This skill should be used when creating or editing package.json, tsconfig, managing npm dependencies, configuring monorepos, or publishing npm packages.

This skill should be used when writing TypeScript tests, configuring Vitest or Jest, testing React components, mocking APIs, or improving test coverage.

This skill should be used when working on TypeScript projects, writing TypeScript code, configuring tsconfig, or reviewing TypeScript code.