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language-typescript SKILL.md skillA

language-typescript from lugassawan/swe-workbench is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add lugassawan/swe-workbench/language-typescript@git:20260828.71a6399

Pins git:20260828.71a6399 in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: lugassawan/swe-workbench
Path: skills/language-typescript/SKILL.md
Versions recorded: 5
Latest version: git:20260828.71a6399, committed Aug 28, 2026
First version recorded: Apr 21, 2026
Size: 4,189 bytes
Repository stars: 3
License: MIT

TypeScript and JavaScript idioms — strict mode, async patterns, and Node. Auto-load when working with .ts, .tsx, .js, .jsx files, package.json, or when the user mentions TypeScript, JavaScript, type safety, or tsconfig.

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

<!-- preload-canary: SWB-PRELOAD-LANGUAGE-TYPESCRIPT -->

# TypeScript / JavaScript

## Strict mode or nothing
Enable in `tsconfig.json`:

```json
{
  "compilerOptions": {
    "strict": true,
    "noUncheckedIndexedAccess": true,
    "noImplicitOverride": true,
    "exactOptionalPropertyTypes": true
  }
}
```

Without these, types lie.

## Prefer `unknown` over `any`
`any` turns off the type system. `unknown` forces narrowing.

```ts
function parse(input: unknown): User {
  if (!isUser(input)) throw new Error("invalid user");
  return input;
}
```

## Discriminated unions over enums
Enums have runtime quirks and poor exhaustiveness. Use string-literal unions with a discriminant.

```ts
type Event =
  | { kind: "click"; x: number; y: number }
  | { kind: "submit"; form: FormData };

function handle(e: Event) {
  switch (e.kind) {
    case "click":  return trackClick(e.x, e.y);
    case "submit": return submit(e.form);
    default: {
      const _exhaustive: never = e; return _exhaustive;
    }
  }
}
```

## Branded types for domain primitives
Stop `UserId` from being passed where an `OrderId` is expected.

```ts
type Brand<K, T> = K & { readonly __brand: T };
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add lugassawan/swe-workbench/language-typescript@sha256:dc9f5393a8f3d2a9

The line at the top of this page pins the label git:20260828.71a6399, 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.

Badge

[![mdr](https://markdownregistry.com/badge/art_vqpvpt6c46mi6lzw.svg)](https://markdownregistry.com/a/art_vqpvpt6c46mi6lzw)

1 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 5 versions of this file, between Apr 21, 2026 and Aug 28, 2026, about one every 32 days.

version	committed	commit	size	audit
git:20260828.71a6399 latest	2026-08-28	71a6399	4,189 B	A	view · diff
git:20260725.074b496	2026-07-25	074b496	4,230 B	A	view · diff
git:20260719.e1f78e0	2026-07-19	e1f78e0	4,173 B	A	view · diff
git:20260623.a686e99	2026-06-23	a686e99	3,872 B	A	view · diff
git:20260421.54db3b9	2026-04-21	54db3b9	3,548 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (4189 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

GitHub

lugassawan/swe-workbench · 3 stars · license MIT · pushed 2026-11-07 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_vqpvpt6c46mi6lzw
GET https://markdownregistry.com/api/v1/resolve?ref=lugassawan/swe-workbench/language-typescript
GET https://markdownregistry.com/api/v1/blob/dc9f5393a8f3d2a9cdd8b061b30fba9451dc165ed173e0ea67ea487265aec215

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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