typescript-best-practices SKILL.md skillA
typescript-best-practices from aiskillstore/marketplace is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add aiskillstore/marketplace/typescript-best-practices@git:20260705.e9e4712Pins git:20260705.e9e4712 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- aiskillstore/marketplace
- Path
skills/0xbigboss/typescript-best-practices/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260705.e9e4712, committed Jul 5, 2026
- First version recorded
- Jan 13, 2026
- Size
- 3,943 bytes
- Repository stars
- 450
- License
- none declared
Use when reading or writing TypeScript or JavaScript files (.ts, .tsx, .js, tsconfig.json).
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
Follows type-first, functional, and error handling patterns from CLAUDE.md. This skill covers language-specific idioms only.
## Pair with React Best Practices
When working with React components (`.tsx`, `.jsx` files or `@react` imports), always load `react-best-practices` alongside this skill. This skill covers TypeScript fundamentals; React-specific patterns (effects, hooks, refs, component design) are in the dedicated React skill.
## Make Illegal States Unrepresentable
Use the type system to prevent invalid states at compile time.
**Discriminated unions for mutually exclusive states:**
```ts
// Good: only valid combinations possible
type RequestState<T> =
| { status: 'idle' }
| { status: 'loading' }
| { status: 'success'; data: T }
| { status: 'error'; error: Error };
// Bad: allows invalid combinations like { loading: true, error: Error }
type RequestState<T> = {
loading: boolean;
data?: T;
error?: Error;
};
```
**Branded types for domain primitives:**
```ts
type UserId = string & { readonly __brand: 'UserId' };
type OrderId = string & { readonly __brand: 'OrderId' };
// Compiler prevents passing OrderId where UserId expected
…Read the whole file at its exact version.
How to install
mdr add aiskillstore/marketplace/typescript-best-practices@sha256:ead45ba0d67c2464The line at the top of this page pins the label git:20260705.e9e4712, 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_iwnugptlqzj2bmmg)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Jan 13, 2026 and Jul 5, 2026, about one every 173 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260705.e9e4712 latest | 2026-07-05 | e9e4712 | 3,943 B | A | view · diff |
| git:20260113.222b7de | 2026-01-13 | 222b7de | 8,703 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 (3943 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
aiskillstore/marketplace · 450 stars · license none declared · pushed 2026-10-31 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_iwnugptlqzj2bmmg GET https://markdownregistry.com/api/v1/resolve?ref=aiskillstore/marketplace/typescript-best-practices GET https://markdownregistry.com/api/v1/blob/ead45ba0d67c2464c85aa1a46c76354e38153c9377968a36e836a771c0b99dbd
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.
More from aiskillstore/marketplace
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