TypeScript/JavaScript Development Skill

@./../_shared/development-workflow.md @./../_shared/typescript-commands.md @./../_shared/react-redux-patterns.md

No `any` — hard rule

New code must not introduce any, explicit or implicit. No any annotations, no as any / as unknown as, no untyped parameters or returns that infer any, no implicitly-any destructures or array/object literals.
Untyped third-party / boundary values must be typed at the boundary (a declared type, unknown + type guard, or a small typed wrapper) — never let any propagate inward.
Mandatory type verification. Before finishing a TS/TSX change, run bun run type-check-pure. If TypeScript LSP tools are available, also inspect changed symbols with hover and go-to-definition; otherwise skip LSP check.