typescript-advanced-type-system SKILL.md skillA
typescript-advanced-type-system from pantheon-org/tekhne is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add pantheon-org/tekhne/typescript-advanced-type-system@git:20260923.7852cb4Pins git:20260923.7852cb4 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- pantheon-org/tekhne
- Path
skills/development/typescript-advanced/type-system/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260923.7852cb4, committed Sep 23, 2026
- Size
- 6,695 bytes
- Repository stars
- 10
- License
- MIT
Advanced TypeScript type-system mechanics — union and intersection types, conditional types with `infer`, mapped types, template literal types, generics and their constraints, index signatures, type assertions, and extracting types from other types (return types, array elements, promise results). Use when designing a complex generic, modeling a type that transforms based on another type, extracting a type from a function or structure with `infer`, or deciding between a type assertion and a…
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 Type System The type-level mechanics that everything else in this skill family builds on: unions, conditionals, mapped types, template literals, generics, and type-level extraction with `infer`. ## Mindset Model the problem in types before reaching for a runtime check — a type that makes an invalid combination unrepresentable is a compile-time guarantee, while a runtime check for the same thing only protects the paths that get exercised. Prefer deriving a type from another type (`ReturnType<typeof fn>`, a mapped type, a conditional extraction with `infer`) over hand-writing a parallel type that can drift out of sync with the thing it describes. When a conditional type distributes over a union unexpectedly, that is usually the type system doing exactly what it's told — wrap the checked type in a tuple (`[T] extends [U]`) to opt out of distribution rather than restructuring the type to dodge it. A type assertion (`as`) is a claim, not a check; only reach for one when you have already established the fact some other way (e.g. immediately after a runtime guard), never as a way to silence an error you haven't investigated. ## When to Apply Use this skill when: …
Read the whole file at its exact version.
How to install
mdr add pantheon-org/tekhne/typescript-advanced-type-system@sha256:da843b57b2ea1d58The line at the top of this page pins the label git:20260923.7852cb4, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_oybznpett3qndpad)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Sep 23, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (6695 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
pantheon-org/tekhne · 10 stars · license MIT · pushed 2026-10-21 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_oybznpett3qndpad GET https://markdownregistry.com/api/v1/resolve?ref=pantheon-org/tekhne/typescript-advanced-type-system GET https://markdownregistry.com/api/v1/blob/da843b57b2ea1d589187b5e63eae461a9bbfdbfffbc957be59a03c31b9df6b89
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.