Deno Knowledge Patch

Use this skill to choose current Deno APIs, CLI flags, configuration, and compatibility behavior. Check the relevant topic reference before changing a project because several features were removed, restored, stabilized, or given new defaults.

Working approach

1. Inspect deno --version, deno.json or deno.jsonc, package.json, deno.lock, workspace configuration, and the commands used by CI.
2. Open every reference relevant to the requested change. Follow the exact option names and stability gates documented there.
3. Treat a later version-attributed statement as superseding an earlier one only for the behavior it explicitly changes.
4. Preserve least-privilege permissions. Do not add -A merely to bypass a permission failure.
5. Keep manifest and lockfile changes together, and use frozen or CI installation modes when reproducibility matters.
6. Verify with the narrowest applicable built-in commands: deno check, deno lint, deno fmt --check, deno test, and the requested build or package command.

Reference index