Code Review Checklist
shareAI-lab/learn-claude-code
Reviews code against a five-part checklist covering security, correctness, performance, maintainability and testing, and reports findings in a fixed format.
Modern JavaScript (ES2022+) patterns for clean, maintainable code.
MITAuto-check passed
Install Javascript Language
$ npx skills add HoangNguyen0403/agent-skills-standard --skill javascript-language -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install HoangNguyen0403/agent-skills-standard javascript-language --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/HoangNguyen0403/agent-skills-standard.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/javascript/javascript-language .claude/skills/javascript-language && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "javascript-language" agent skill from https://github.com/HoangNguyen0403/agent-skills-standard/tree/develop/skills/javascript/javascript-language into .claude/skills/javascript-language/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "javascript-language", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/HoangNguyen0403/agent-skills-standard/tree/develop/skills/javascript/javascript-languageType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add HoangNguyen0403/agent-skills-standard --skill javascript-language -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install HoangNguyen0403/agent-skills-standard javascript-language --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/HoangNguyen0403/agent-skills-standard.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/javascript/javascript-language .agents/skills/javascript-language && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "javascript-language" agent skill from https://github.com/HoangNguyen0403/agent-skills-standard/tree/develop/skills/javascript/javascript-language into .agents/skills/javascript-language/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "javascript-language", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add HoangNguyen0403/agent-skills-standard --skill javascript-language -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install HoangNguyen0403/agent-skills-standard javascript-language --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/HoangNguyen0403/agent-skills-standard.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/javascript/javascript-language .cursor/skills/javascript-language && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "javascript-language" agent skill from https://github.com/HoangNguyen0403/agent-skills-standard/tree/develop/skills/javascript/javascript-language into .cursor/skills/javascript-language/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "javascript-language", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/HoangNguyen0403/agent-skills-standard.git --path skills/javascript/javascript-language--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add HoangNguyen0403/agent-skills-standard --skill javascript-language -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install HoangNguyen0403/agent-skills-standard javascript-language --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/HoangNguyen0403/agent-skills-standard.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/javascript/javascript-language .gemini/skills/javascript-language && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "javascript-language" agent skill from https://github.com/HoangNguyen0403/agent-skills-standard/tree/develop/skills/javascript/javascript-language into .gemini/skills/javascript-language/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "javascript-language", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install HoangNguyen0403/agent-skills-standard javascript-languageInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add HoangNguyen0403/agent-skills-standard --skill javascript-language -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/HoangNguyen0403/agent-skills-standard.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/javascript/javascript-language .github/skills/javascript-language && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "javascript-language" agent skill from https://github.com/HoangNguyen0403/agent-skills-standard/tree/develop/skills/javascript/javascript-language into .github/skills/javascript-language/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "javascript-language", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add HoangNguyen0403/agent-skills-standard --skill javascript-language -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install HoangNguyen0403/agent-skills-standard javascript-language --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/HoangNguyen0403/agent-skills-standard.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/javascript/javascript-language .opencode/skills/javascript-language && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "javascript-language" agent skill from https://github.com/HoangNguyen0403/agent-skills-standard/tree/develop/skills/javascript/javascript-language into .opencode/skills/javascript-language/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "javascript-language", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
javascript-language- GitHub stars
- 571
- Token cost
- ~547 tokens
- SKILL.md length
- 190 words
- Files
- 3 (incl. references)
- Skills in repo
- 211
- Repo updated
- First seen
- Licence
- MIT
At a glance
Modern JavaScript (ES2022+) patterns for clean, maintainable code.
- Working with modern JavaScript features like optional chaining
- SKILL.md covers Priority: P0 (CRITICAL), Implementation Guidelines, Anti-Patterns and Code & Reference, plus 2 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Nullish coalescing
What it does
Javascript Language is an agent skill from HoangNguyen0403/agent-skills-standard. Modern JavaScript (ES2022+) patterns for clean, maintainable code. Use when working with modern JavaScript features like optional chaining, nullish coalescing, or ESM.
Its SKILL.md is about 550 tokens, which your agent loads only when the skill is triggered. The skill folder holds 4 other files, including reference files (for example `evals/evals.json` and `references/REFERENCE.md`).
It works with JavaScript. The repository describes itself as: A collection of Agent Skills Standard and Best Practice for Programming Languages, Frameworks that help our AI Agent follow best practies on frameworks and programming laguages. The licence is MIT.
When your agent uses it
- Working with modern JavaScript features like optional chaining
- Nullish coalescing
Example prompts
- “/javascript-language”
What it can do on your machine
Read from SKILL.md and the folder at commit 73422bd. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Javascript Language loads about 547 tokens when it runs, and up to ~1.3k if it reads all its reference files. Until then it costs about 47 tokens; SKILL.md has 190 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from HoangNguyen0403/agent-skills-standard at commit 73422bd, republished under its MIT licence (© HoangNguyen0403). 190 words, ~547 tokens.
Download SKILL.mdSave it as
.claude/skills/javascript-language/SKILL.md (or your agent's skills folder). This skill also uses 2 other files; get the full folder from GitHub.- name
- javascript-language
- description
- Modern JavaScript (ES2022+) patterns for clean, maintainable code. Use when working with modern JavaScript features like optional chaining, nullish coalescing, or ESM.
JavaScript Language Patterns
Priority: P0 (CRITICAL)
Implementation Guidelines
- Variables: const default. let if needed. No var — block scope only.
- Functionality: Use
Arrow Functionsfor callbacks/inlines;Function Declarationfor core logic. - Async Logic: Use async/await with try/catch and Promise.all() for parallel operations. ESM import/export only. No Callbacks — promisify everything.
- Modern Syntax: Use Destructuring, Spread (...), Optional Chain ?. and Nullish ?? coalescing.
- String Handling: Use
Template Literals(backticks) for interpolation and multi-line strings. - Data Collections: Prefer
map,filter, andreduceover imperativeforloops. - Modules: Standardize on ESM import/export; use Named Exports over Default.
- Encapsulation: Leverage
#privateclass fields for encapsulation. - Error States: Throw
new Error()with descriptive messages; never throw strings.
Anti-Patterns
- No var — Block scope only.
- No
==: Strict===. - No
new Object(): Use literals{}. - No Callbacks: Promisify everything.
- No Mutation: Immutability first.
Code & Reference
See references/REFERENCE.md for modern syntax, async patterns, private fields, and functional programming examples.
Related Topics
best-practices | tooling
Canonical response anchors
When this skill applies, preserve the following domain terminology or equivalent concrete examples in the answer when relevant:
ESM import/export
No Callbacks
No var
Nullish ??
Optional Chain ?.
async/await
const default
let if needed
user?.profile?.name
Additional task-grounded exact anchors: try/catch
© HoangNguyen0403, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 2 other files (references) in skills/javascript/javascript-language of HoangNguyen0403/agent-skills-standard.
- SKILL.md
- evals/evals.json
- references/REFERENCE.md
Open the folder on GitHubat commit 73422bd
Compare with similar skills
Javascript Language next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Javascript Language this skillHoangNguyen0403/agent-skills-standard | 571 | — | ~547 | Automated safety check: Pass | MIT | |
| Code Review ChecklistshareAI-lab/learn-claude-code | 78k | 5 repos | ~1.1k | Automated safety check: Pass | MIT | |
| Tailwindcss Developmentanonaddy/anonaddy | 4.9k | 10 repos | ~865 | Automated safety check: Pass | MIT | |
| Figma use_figma Plugin API Ruleswarpdotdev/warp | 65k | 4 repos | ~4.4k | Automated safety check: Pass | AGPL-3.0 | |
| Install Anti-Slop Oxlint Rulesdmmulroy/anti-slop | 5.3k | 1 repos | ~2.2k | Automated safety check: Pass | MIT | |
| GSAP Core Animationgreensock/gsap-skills | 16k | 4 repos | ~3.7k | Automated safety check: Pass | MIT |
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Related
Works with
Questions about Javascript Language
What does Javascript Language do?
Modern JavaScript (ES2022+) patterns for clean, maintainable code. Javascript Language is an agent skill from HoangNguyen0403/agent-skills-standard. Modern JavaScript (ES2022+) patterns for clean, maintainable code.
When should I use Javascript Language?
Javascript Language fits situations like: working with modern JavaScript features like optional chaining; nullish coalescing.
How do I install Javascript Language in Claude Code?
Run `npx skills add HoangNguyen0403/agent-skills-standard --skill javascript-language -a claude-code`. Or copy the skill folder (skills/javascript/javascript-language in HoangNguyen0403/agent-skills-standard) into .claude/skills/javascript-language in your project. Claude Code loads it when a task matches its description.
How do I install Javascript Language in Codex?
Run `npx skills add HoangNguyen0403/agent-skills-standard --skill javascript-language -a codex`. Or copy the skill folder (skills/javascript/javascript-language in HoangNguyen0403/agent-skills-standard) into .agents/skills/javascript-language in your project. Codex loads it when a task matches its description.
Can I use Javascript Language in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add HoangNguyen0403/agent-skills-standard --skill javascript-language -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/javascript-language, .gemini/skills/javascript-language, .github/skills/javascript-language and .opencode/skills/javascript-language in your project.
What does Javascript Language need to run?
SKILL.md names no scripts, command-line tools or credentials: Javascript Language is instructions for the agent only.
Does Javascript Language access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Javascript Language safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Javascript Language use?
Javascript Language is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Javascript Language use?
About 547 tokens (SKILL.md is roughly 2.2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 748 tokens, read only when the agent opens those files.
What are the alternatives to Javascript Language?
Skills that share tags, products or a category with Javascript Language: Code Review Checklist (shareAI-lab/learn-claude-code, 78k stars), Tailwindcss Development (anonaddy/anonaddy, 4.9k stars), Figma use_figma Plugin API Rules (warpdotdev/warp, 65k stars) and Install Anti-Slop Oxlint Rules (dmmulroy/anti-slop, 5.3k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Javascript Language?
HoangNguyen0403 (a GitHub user) maintains it in HoangNguyen0403/agent-skills-standard, which has 571 GitHub stars. The repository holds 211 skills in this directory. The repository was last updated on October 7, 2026.
Source: HoangNguyen0403/agent-skills-standard on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.