modern-javascript-patterns

A guide to newer JavaScript features and common ways to structure code, including promises, modules, and functions that handle data. It is for writing and updating JavaScript applications.

In plain words
What is it for?
Use it when refactoring older JavaScript, adding modern language features, or improving how an application handles asynchronous work and data.
Why use it?
It helps replace older, harder-to-follow code with clearer patterns and avoids having to remember how each newer feature is used.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/norkzyt/claude-code-autopilot/modern-javascript-patterns
Any agent
npx skills add NorkzYT/claude-code-autopilot --skill modern-javascript-patterns
Clone the repo
git clone --depth 1 https://github.com/NorkzYT/claude-code-autopilot

Made for: Claude Code, Codex.

Per session 64 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 5,440 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. Scan, not verified.
Origin unknown No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00064 $0.05440
Opus 5 $0.00032 $0.02720
Sonnet 5 $0.00013 $0.01088
Haiku 4.5 $0.00006 $0.00544

Measured 2d ago against content hash 40c03bbf1a52, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

modern-javascript-patterns scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

return await fetch(url);
.claude/skills/modern-javascript-patterns/SKILL.md · 928 lines

The source is not reproduced here

Licensed GPL-3.0

The repository is licensed GPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 928 lines · 64 tokens per session scan A 40c03bbf1a52

Subscribe to this mod's changes

modern-javascript-patterns is a skill published in the GitHub repository NorkzYT/claude-code-autopilot (2 stars, last pushed 2mo ago), licensed GPL-3.0. It adds 64 tokens to every session and 5,440 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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