JavaScript & TypeScript

Primary reference: TypeScript docs. Rule files below link to the specific docs section they encode; when a rule and the official docs disagree, the docs win and the rule should be updated.

This Project: Deno

• Use Deno's configured import map and include .ts in local import specifiers.
• Write BDD tests with @std/testing/bdd and import expect explicitly from @std/expect.
• Do not add test preloads, setup files, ambient globals, or runner configuration to supply missing test identifiers. Report immutable-test boundary defects instead.
• Run task verify after every edit and before committing; it is the project's lint, full-test, 100%-coverage, and mutation-test gate.
• For behavior changes, follow the project's TCRDD workflow; keep implementations small and dependency-free unless the task requires otherwise.

Route to Sub-skills

type-system/ and zod/ are reference bundles read on demand from this router — they are not independently discovered skills, so their own frontmatter is intentionally minimal (no duplicate trigger list needed).