typescript

Context skill for TypeScript projects covering type safety patterns, pnpm monorepo management, package publishing, Vitest testing, ESLint/Prettier, and GitLab CI.

Philosophy

All projects enable strict: true in tsconfig.json and avoid type casts in favour of narrowing or using types exported by the libraries in use. Workspaces are managed with pnpm; packages are linked via workspace protocol rather than copied. Tests run with Vitest using --import-mode=importlib so same-named test files can coexist across packages. Linting and formatting are enforced by pre-commit hooks so CI never sees unformatted code.

Recipes

• TypeScript Conventions: Strict Mode, Type Safety, and Error Handling — strict mode setup, unknown in catch, avoiding casts, Zod schema typing, naming
• pnpm Monorepo Setup — workspace declaration, internal libs with workspace:*, consuming packages
• Managing Shared Dependencies with pnpm Catalogs — catalogs, named catalogs, supply-chain guard with onlyBuiltDependencies
• Publishing TypeScript Packages — npm and GitLab registry, dual ESM/CJS, Changesets
• Unit and E2E Testing with Vitest — unit, integration, and Playwright browser tests
• Code Quality: ESLint, Prettier, and Pre-commit Hooks — flat config, module boundaries, husky/lint-staged
• GitLab CI for pnpm Monorepos — cached installs, per-package change detection, publish

References

• TypeScript documentation
• Vitest documentation