javascript-ops SKILL.md skillB
javascript-ops from 0xdarkmatter/claude-mods is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add 0xdarkmatter/claude-mods/javascript-ops@git:20261005.82dd412Pins git:20261005.82dd412 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- B, 16 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- 0xdarkmatter/claude-mods
- Path
skills/javascript-ops/SKILL.md- Versions recorded
- 5
- Latest version
- git:20261005.82dd412, committed Oct 5, 2026
- First version recorded
- Mar 9, 2026
- Size
- 12,713 bytes
- Repository stars
- 68
- License
- MIT
JavaScript and Node.js patterns, async programming, modules, runtime internals, and modern ES2024+ features. Use for: javascript, js, node, nodejs, esm, commonjs, promise, async await, event loop, v8, npm, es6, es2024, worker threads, streams, event emitter, prototype, closure.
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
# JavaScript Operations Comprehensive reference for modern JavaScript and Node.js — async patterns, module systems, runtime internals, and ES2022-2025 features. --- ## Async Decision Tree ``` What are you doing asynchronously? │ ├─ Simple one-off operation (DB query, HTTP call) │ └─ async/await with try/catch ✓ default choice │ ├─ Multiple independent operations │ ├─ All must succeed → Promise.all([a(), b(), c()]) │ ├─ Don't care about failures → Promise.allSettled([...]) │ └─ First one wins → Promise.race([...]) or Promise.any([...]) │ ├─ Need external resolve/reject control (deferred) │ └─ Promise.withResolvers() (ES2024) │ ├─ Processing a sequence of async values │ ├─ Known array → for...of with await inside loop │ └─ Unknown/infinite sequence → async generator + for await...of │ ├─ Large data / backpressure concerns │ └─ Streams (ReadableStream / node:stream) │ ├─ Transform data in flight → TransformStream / Transform │ └─ Pipe chain → stream.pipeline() (Node) / pipeThrough() (Web) │ ├─ CPU-intensive work (would block event loop) │ ├─ Short burst → offload with setTimeout(fn, 0) to yield …
Read the whole file at its exact version.
How to install
mdr add 0xdarkmatter/claude-mods/javascript-ops@sha256:4d2bbd32159ab428The line at the top of this page pins the label git:20261005.82dd412, 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_xj757xvtc65denlr)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 5 versions of this file, between Mar 9, 2026 and Oct 5, 2026, about one every 53 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261005.82dd412 latest | 2026-10-05 | 82dd412 | 12,713 B | B | view · diff |
| git:20260705.df16013 | 2026-07-05 | df16013 | 12,558 B | B | view · diff |
| git:20260610.e29f196 | 2026-06-10 | e29f196 | 12,493 B | B | view · diff |
| git:20260410.d221136 | 2026-04-10 | d221136 | 12,330 B | B | view · diff |
| git:20260309.cd4e5d2 | 2026-03-09 | cd4e5d2 | 12,285 B | B | view |
Audit of the latest version
- fail: No script tag (matched: <script)
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (12713 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
Starting a new one? Use a template for SKILL.md on mdpantry, which passes every one of these checks and says what to change in it.
Source
0xdarkmatter/claude-mods · 68 stars · license MIT · pushed 2026-10-14 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_xj757xvtc65denlr GET https://markdownregistry.com/api/v1/resolve?ref=0xdarkmatter/claude-mods/javascript-ops GET https://markdownregistry.com/api/v1/blob/4d2bbd32159ab42865e1110a2bfa92bc2d4f01fd5baddf266d7899b4689ea845
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.