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.
A skill your agent uses when reviewing large SPA bundles, new dependency additions, or routes that feel slow to hydrate.
MITAuto-check passed
Install Code Splitting
$ npx skills add thedaviddias/Front-End-Checklist --skill code-splitting -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install thedaviddias/Front-End-Checklist code-splitting --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/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/code-splitting .claude/skills/code-splitting && 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 "code-splitting" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/code-splitting into .claude/skills/code-splitting/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-splitting", 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/thedaviddias/Front-End-Checklist/tree/main/skills/code-splittingType 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 thedaviddias/Front-End-Checklist --skill code-splitting -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install thedaviddias/Front-End-Checklist code-splitting --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/code-splitting .agents/skills/code-splitting && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "code-splitting" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/code-splitting into .agents/skills/code-splitting/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-splitting", 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 thedaviddias/Front-End-Checklist --skill code-splitting -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install thedaviddias/Front-End-Checklist code-splitting --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/code-splitting .cursor/skills/code-splitting && 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 "code-splitting" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/code-splitting into .cursor/skills/code-splitting/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-splitting", 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/thedaviddias/Front-End-Checklist.git --path skills/code-splitting--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 thedaviddias/Front-End-Checklist --skill code-splitting -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install thedaviddias/Front-End-Checklist code-splitting --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/code-splitting .gemini/skills/code-splitting && 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 "code-splitting" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/code-splitting into .gemini/skills/code-splitting/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-splitting", 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 thedaviddias/Front-End-Checklist code-splittingInstalls 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 thedaviddias/Front-End-Checklist --skill code-splitting -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/code-splitting .github/skills/code-splitting && 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 "code-splitting" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/code-splitting into .github/skills/code-splitting/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-splitting", 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 thedaviddias/Front-End-Checklist --skill code-splitting -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install thedaviddias/Front-End-Checklist code-splitting --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/code-splitting .opencode/skills/code-splitting && 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 "code-splitting" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/code-splitting into .opencode/skills/code-splitting/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-splitting", 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
code-splitting- GitHub stars
- 74k
- Token cost
- ~492 tokens
- SKILL.md length
- 204 words
- Files
- 2 (incl. references)
- Skills in repo
- 390
- Repo updated
- First seen
- Licence
- MIT
At a glance
A skill your agent uses when reviewing large SPA bundles, new dependency additions, or routes that feel slow to hydrate.
- Reviewing large SPA bundles
- SKILL.md covers Quick Reference, Check, Fix and Explain, plus 1 more section
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- New dependency additions
What it does
Code Splitting is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing large SPA bundles, new dependency additions, or routes that feel slow to hydrate. Focus on code that is not required for the initial view and can move behind route transitions, user interaction, or viewport-based loading.
Its SKILL.md is about 490 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/rule.md`).
It works with JavaScript. The repository describes itself as: 🗂 The essential checklist for modern web development, for humans and AI agents. The licence is MIT.
When your agent uses it
- Reviewing large SPA bundles
- New dependency additions
- Routes that feel slow to hydrate
Example prompts
- “/code-splitting”
What it can do on your machine
Read from SKILL.md and the folder at commit e8d14d0. 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
Links to these hosts (documentation or services it may open):
frontendchecklist.io
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
Code Splitting loads about 492 tokens when it runs, and up to ~1.5k if it reads all its reference files. Until then it costs about 64 tokens; SKILL.md has 204 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 thedaviddias/Front-End-Checklist at commit e8d14d0, republished under its MIT licence (© thedaviddias). 204 words, ~492 tokens.
Download SKILL.mdSave it as
.claude/skills/code-splitting/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- code-splitting
- description
- Use when reviewing large SPA bundles, new dependency additions, or routes that feel slow to hydrate. Focus on code that is not required for the initial view and can move behind route transitions, user interaction, or viewport-based loading.
- metadata.category
- javascript
- metadata.priority
- high
- metadata.difficulty
- intermediate
- metadata.estimatedTime
- 25
- metadata.source
- frontendchecklist.io
- metadata.url
- https://frontendchecklist.io/rules/javascript/code-splitting
Split large JavaScript bundles
A 500 KB JavaScript bundle blocks page interactivity for 3–5 seconds on a mid-range mobile device even after the bytes arrive — JS must be parsed and compiled before execution. Code splitting means users only download and parse the code they actually need for the current page, dramatically improving Time to Interactive.
Quick Reference
- Use dynamic import() to load code only when it's actually needed
- Split routes in SPAs so each page loads only its own code
- Lazy-load heavy third-party libraries (chart libraries, rich text editors)
- Analyze your bundle with a visualizer to find what to split
Check
Identify any large third-party imports or feature modules in this file that could be loaded lazily with dynamic import() instead of statically.
Fix
Convert the identified static imports to dynamic imports using import() and add appropriate loading states.
Explain
Explain JavaScript code splitting, how dynamic import() works, and how to implement route-based splitting in a SPA.
Code Review
Inspect route modules, heavy feature imports, and third-party libraries loaded on initial render. Flag dependencies that can move behind import(), route boundaries, or user-triggered flows without breaking the first meaningful paint.
For full implementation details, code examples, and framework-specific guidance,
see references/rule.md.
Rule page: https://frontendchecklist.io/rules/javascript/code-splitting
© thedaviddias, 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 1 other file (references) in skills/code-splitting of thedaviddias/Front-End-Checklist.
- SKILL.md
- references/rule.md
Open the folder on GitHubat commit e8d14d0
Compare with similar skills
Code Splitting 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 |
|---|---|---|---|---|---|---|
| Code Splitting this skillthedaviddias/Front-End-Checklist | 74k | — | ~492 | 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 | |
| GSAP Core Animationgreensock/gsap-skills | 16k | 4 repos | ~3.7k | Automated safety check: Pass | MIT | |
| JavaScript Concept Fact Checkerleonardomso/33-js-concepts | 67k | 1 repos | ~5k | Automated safety check: Pass | MIT |
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Required groundwork before any use_figma call: the rules and reference files for running JavaScript in a Figma file through the Plugin API without common failures.
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Covers the GSAP core API for tweens, easing, staggers, defaults and matchMedia, and when to choose GSAP over CSS animations or other JavaScript animation libraries.
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Verifies the technical accuracy of JavaScript concept pages by checking code examples, MDN and ECMAScript claims and external links through a five-phase method.
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Related
Works with
Questions about Code Splitting
What does Code Splitting do?
A skill your agent uses when reviewing large SPA bundles, new dependency additions, or routes that feel slow to hydrate. Code Splitting is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing large SPA bundles, new dependency additions, or routes that feel slow to hydrate.
When should I use Code Splitting?
Code Splitting fits situations like: reviewing large SPA bundles; new dependency additions; routes that feel slow to hydrate.
How do I install Code Splitting in Claude Code?
Run `npx skills add thedaviddias/Front-End-Checklist --skill code-splitting -a claude-code`. Or copy the skill folder (skills/code-splitting in thedaviddias/Front-End-Checklist) into .claude/skills/code-splitting in your project. Claude Code loads it when a task matches its description.
How do I install Code Splitting in Codex?
Run `npx skills add thedaviddias/Front-End-Checklist --skill code-splitting -a codex`. Or copy the skill folder (skills/code-splitting in thedaviddias/Front-End-Checklist) into .agents/skills/code-splitting in your project. Codex loads it when a task matches its description.
Can I use Code Splitting 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 thedaviddias/Front-End-Checklist --skill code-splitting -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/code-splitting, .gemini/skills/code-splitting, .github/skills/code-splitting and .opencode/skills/code-splitting in your project.
What does Code Splitting need to run?
SKILL.md names no scripts, command-line tools or credentials: Code Splitting is instructions for the agent only.
Does Code Splitting access the network?
SKILL.md names 1 domain. As links in the text: frontendchecklist.io. This is read from the text; nothing was executed.
Is Code Splitting 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 Code Splitting use?
Code Splitting 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 Code Splitting use?
About 492 tokens (SKILL.md is roughly 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 999 tokens, read only when the agent opens those files.
What are the alternatives to Code Splitting?
Skills that share tags, products or a category with Code Splitting: 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 GSAP Core Animation (greensock/gsap-skills, 16k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Code Splitting?
thedaviddias (a GitHub user) maintains it in thedaviddias/Front-End-Checklist, which has 74,388 GitHub stars. The repository holds 390 skills in this directory. The repository was last updated on October 6, 2026.
Source: thedaviddias/Front-End-Checklist on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.