typescript SKILL.md skillA

This file is byte-identical to the first copy the registry indexed. Same content hash, so the same checks give both the same grade.

typescript from alexander-danilenko/cortex-ai-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

mdr add alexander-danilenko/cortex-ai-skills/typescript@git:20261013.ecfffa1

Pins git:20261013.ecfffa1 in mdr.lock. Pin the fingerprint instead.

Audit grade

A, 17 of 17 checks passed

Kind

SKILL.md skill

Repository

alexander-danilenko/cortex-ai-skills

Path

plugins/engineering/cortex-web/skills/typescript/SKILL.md

Versions recorded

1

Latest version

git:20261013.ecfffa1, committed Oct 13, 2026

Size

4,290 bytes

Repository stars

17

License

MIT

Apply these opinionated TypeScript conventions whenever writing or reviewing TypeScript: branded types for domain modeling, discriminated unions for state, `satisfies` over `as`, const objects instead of enums, type-only imports, and the strict tsconfig baseline beyond `strict: true`. Also use for monorepo project references and incremental build setup.

Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.

What the file says

# TypeScript

House conventions for TypeScript 5+. Apply them to code you are writing or changing — don't refactor untouched files to match unless asked.

## Conventions

- **Model the domain in types, not in checks.** Branded types (`type UserId = string & { readonly __brand: 'UserId' }`) and discriminated unions push errors to compile time, where they cost nothing. A runtime guard catches the same bug in production.
- **Discriminated unions for anything with states** — request lifecycles, form state, parse results. The compiler then forces every state to be handled, so a new variant surfaces as an error rather than a silent fallthrough.
- **`satisfies` over `as`.** `satisfies` validates against a type while keeping the narrow inferred literal; `as` throws the check away. Reach for `as` only when you know something the compiler cannot, and say why in a comment.
- **Const objects over `enum`.** `as const` objects are plain values with no emit and no nominal-typing surprises; `enum` generates runtime code and `const enum` breaks under `isolatedModules`.
…

Read the whole file at its exact version.

How to install

mdr add alexander-danilenko/cortex-ai-skills/typescript@sha256:b2ef9c5aeddaa892

[![mdr](https://markdownregistry.com/badge/art_txbayfhc7cgfwett.svg)](https://markdownregistry.com/a/art_txbayfhc7cgfwett)

Versions

The registry has recorded 1 version of this file, committed on Oct 13, 2026.

Audit of the latest version

Source

API

GET https://markdownregistry.com/api/v1/artifacts/art_txbayfhc7cgfwett
GET https://markdownregistry.com/api/v1/resolve?ref=alexander-danilenko/cortex-ai-skills/typescript
GET https://markdownregistry.com/api/v1/blob/b2ef9c5aeddaa892af8e3281faf6c7787af20423530db1570303f400a68838ec

Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.

Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.

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