typescript-best-practices SKILL.md skillA
typescript-best-practices from michael-denyer/pstack-claude is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add michael-denyer/pstack-claude/typescript-best-practices@git:20261020.d56fdb0Pins git:20261020.d56fdb0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- michael-denyer/pstack-claude
- Path
plugins/pstack/skills/typescript-best-practices/SKILL.md- Versions recorded
- 7
- Latest version
- git:20261020.d56fdb0, committed Oct 20, 2026
- First version recorded
- Aug 25, 2026
- Size
- 2,874 bytes
- Repository stars
- 3,776
- License
- MIT
TypeScript best practices. Use when reading or editing any .ts or .tsx file.
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 best practices
On Muse, read the [platform mapping](../poteto-mode/references/muse-tools.md), including its per-skill notes, before following this skill.
Apply the **type-system-discipline** principle skill first.
| Rule | Summary |
|------|---------|
| Discriminated unions | Model variants with a `kind` literal discriminant so impossible states can't be represented. No optional-field bags. |
| Branded types | Brand primitives with `& { readonly __brand: "X" }` so they can't be mixed up. Validate once at the boundary. A brand comes from a verifying type guard (`input is AgentId`), never from `as`. |
| Constructive modeling | Build the shape so the illegal value can't be constructed. `[T, ...T[]]` for non-empty, `[T, T][]` for even length, `start` plus `duration` for a range. Not a runtime guard, not a wish for refinement types. |
| Simplest total type | Keep `T[]` while every operation on it stays total. Strengthen to `NonEmpty<T>` only where the loose type forces `!`, a cast, or a "should never happen" throw. |
| `unknown` over `any` | External data is `unknown`. |
…Read the whole file at its exact version.
How to install
mdr add michael-denyer/pstack-claude/typescript-best-practices@sha256:5b42261bc68bb649The line at the top of this page pins the label git:20261020.d56fdb0, 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_ffx73ghsfdst5k2h)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 7 versions of this file, between Aug 25, 2026 and Oct 20, 2026, about one every 9 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261020.d56fdb0 latest | 2026-10-20 | d56fdb0 | 2,874 B | A | view · diff |
| git:20261019.49b6850 | 2026-10-19 | 49b6850 | 2,734 B | A | view · diff |
| git:20260907.ebb8c27 | 2026-09-07 | ebb8c27 | 2,653 B | A | view · diff |
| git:20260907.09f3a50 | 2026-09-07 | 09f3a50 | 2,749 B | A | view · diff |
| git:20260905.080177f | 2026-09-05 | 080177f | 2,818 B | A | view · diff |
| git:20260827.7ac420e | 2026-08-27 | 7ac420e | 2,601 B | A | view · diff |
| git:20260825.661af2b | 2026-08-25 | 661af2b | 2,532 B | A | view |
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 (2874 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
michael-denyer/pstack-claude · 3,776 stars · license MIT · pushed 2026-11-02 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_ffx73ghsfdst5k2h GET https://markdownregistry.com/api/v1/resolve?ref=michael-denyer/pstack-claude/typescript-best-practices GET https://markdownregistry.com/api/v1/blob/5b42261bc68bb649ec07aac8fa23912cff9701d26dc20b04a33096c3cba513c9
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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