JavaScript & TypeScript

Claude Code: /plugin marketplace add wshobson/agents → /plugin install javascript-typescript@claude-code-workflows

Two agents, one for modern JavaScript and one for TypeScript, plus a scaffold command and four skills. The TypeScript skill goes past generics into conditional types, mapped types and template literal types, which is the machinery needed to type an API client or a form validator without falling back on casts. The testing skill lays out both Jest and Vitest; the sample Jest configuration is a jest.config.ts file on the ts-jest preset, precisely the spot where a project emitting ESM tends to break, so it is worth reading before copying. Node guidance is opinionated in a useful way: Zod or Joi at the boundary, Pino or Winston for structured logs, and no wildcard CORS in production.