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A skill your agent uses when reviewing scripts, client components, bundles, or runtime behavior related to Prefer immutable data patterns.
MITAuto-check passed
Install Immutable Patterns
$ npx skills add thedaviddias/Front-End-Checklist --skill immutable-patterns -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install thedaviddias/Front-End-Checklist immutable-patterns --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/immutable-patterns .claude/skills/immutable-patterns && 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 "immutable-patterns" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/immutable-patterns into .claude/skills/immutable-patterns/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "immutable-patterns", 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/immutable-patternsType 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 immutable-patterns -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install thedaviddias/Front-End-Checklist immutable-patterns --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/immutable-patterns .agents/skills/immutable-patterns && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "immutable-patterns" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/immutable-patterns into .agents/skills/immutable-patterns/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "immutable-patterns", 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 immutable-patterns -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install thedaviddias/Front-End-Checklist immutable-patterns --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/immutable-patterns .cursor/skills/immutable-patterns && 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 "immutable-patterns" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/immutable-patterns into .cursor/skills/immutable-patterns/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "immutable-patterns", 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/immutable-patterns--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 immutable-patterns -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install thedaviddias/Front-End-Checklist immutable-patterns --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/immutable-patterns .gemini/skills/immutable-patterns && 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 "immutable-patterns" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/immutable-patterns into .gemini/skills/immutable-patterns/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "immutable-patterns", 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 immutable-patternsInstalls 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 immutable-patterns -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/immutable-patterns .github/skills/immutable-patterns && 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 "immutable-patterns" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/immutable-patterns into .github/skills/immutable-patterns/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "immutable-patterns", 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 immutable-patterns -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 immutable-patterns --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/immutable-patterns .opencode/skills/immutable-patterns && 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 "immutable-patterns" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/immutable-patterns into .opencode/skills/immutable-patterns/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "immutable-patterns", 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
immutable-patterns- GitHub stars
- 74k
- Token cost
- ~505 tokens
- SKILL.md length
- 208 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 scripts, client components, bundles, or runtime behavior related to Prefer immutable data patterns.
- Reviewing scripts
- 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
- Client components
What it does
Immutable Patterns is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing scripts, client components, bundles, or runtime behavior related to Prefer immutable data patterns. Inspect both source code and the browser execution path so fixes target the real bottleneck or bug.
Its SKILL.md is about 510 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`).
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 scripts
- Client components
- Runtime behavior related to Prefer immutable data patterns
Example prompts
- “/immutable-patterns”
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
Immutable Patterns loads about 505 tokens when it runs, and up to ~1.5k if it reads all its reference files. Until then it costs about 59 tokens; SKILL.md has 208 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). 208 words, ~505 tokens.
Download SKILL.mdSave it as
.claude/skills/immutable-patterns/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- immutable-patterns
- description
- Use when reviewing scripts, client components, bundles, or runtime behavior related to Prefer immutable data patterns. Inspect both source code and the browser execution path so fixes target the real bottleneck or bug.
- metadata.category
- javascript
- metadata.priority
- medium
- metadata.difficulty
- intermediate
- metadata.estimatedTime
- 20
- metadata.source
- frontendchecklist.io
- metadata.url
- https://frontendchecklist.io/rules/javascript/immutable-patterns
Prefer immutable data patterns
Mutating shared objects makes it impossible to track where a value changed. When you update state immutably, each version of the data is a separate object — you can compare references to detect changes, time-travel debug, and know exactly which part of your code changed the data.
Quick Reference
- Use spread (...) to create modified copies of objects and arrays
- Prefer map(), filter(), and reduce() over push(), splice(), and direct assignment
- Use Object.freeze() for configuration objects that should never change
- Immutability is especially important in state management (Redux, Zustand, Signals)
Check
Find all places in this code where objects or arrays are mutated in place. Flag direct property assignments on function parameters and push/splice on arrays.
Fix
Replace in-place mutations with immutable patterns using spread operators and non-mutating array methods.
Explain
Explain immutable data patterns, why mutation causes bugs in shared state, and how spread and array methods enable immutability.
Code Review
Review scripts, client components, and browser execution paths related to Prefer immutable data patterns. Flag exact imports, event handlers, runtime side effects, or blocking operations that violate the rule, and state how the change should be verified in the browser.
For full implementation details, code examples, and framework-specific guidance,
see references/rule.md.
Rule page: https://frontendchecklist.io/rules/javascript/immutable-patterns
© 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/immutable-patterns of thedaviddias/Front-End-Checklist.
- SKILL.md
- references/rule.md
Open the folder on GitHubat commit e8d14d0
Compare with similar skills
Immutable Patterns 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 |
|---|---|---|---|---|---|---|
| Immutable Patterns this skillthedaviddias/Front-End-Checklist | 74k | — | ~505 | Automated safety check: Pass | MIT | |
| Triage Support Bundlenetdata/netdata | 81k | — | ~2.7k | Automated safety check: Pass | GPL-3.0 | |
| Analyzing Backend BundleTriliumNext/Trilium | 38k | — | ~2.6k | Automated safety check: Pass | AGPL-3.0 | |
| Production Bundle Auditkeybase/client | 9.3k | — | ~620 | Automated safety check: Pass | BSD-3-Clause | |
| Create Paperclip Bundled Skillpaperclipai/paperclip | 98k | — | ~2.7k | Automated safety check: Pass | MIT | |
| Rig Bundles And Shareable Artifactsmvschwarz/openrig | 5.5k | — | ~1.1k | Automated safety check: Pass | Apache-2.0 |
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Questions about Immutable Patterns
What does Immutable Patterns do?
A skill your agent uses when reviewing scripts, client components, bundles, or runtime behavior related to Prefer immutable data patterns. Immutable Patterns is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing scripts, client components, bundles, or runtime behavior related to Prefer immutable data patterns.
When should I use Immutable Patterns?
Immutable Patterns fits situations like: reviewing scripts; client components; runtime behavior related to Prefer immutable data patterns.
How do I install Immutable Patterns in Claude Code?
Run `npx skills add thedaviddias/Front-End-Checklist --skill immutable-patterns -a claude-code`. Or copy the skill folder (skills/immutable-patterns in thedaviddias/Front-End-Checklist) into .claude/skills/immutable-patterns in your project. Claude Code loads it when a task matches its description.
How do I install Immutable Patterns in Codex?
Run `npx skills add thedaviddias/Front-End-Checklist --skill immutable-patterns -a codex`. Or copy the skill folder (skills/immutable-patterns in thedaviddias/Front-End-Checklist) into .agents/skills/immutable-patterns in your project. Codex loads it when a task matches its description.
Can I use Immutable Patterns 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 immutable-patterns -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/immutable-patterns, .gemini/skills/immutable-patterns, .github/skills/immutable-patterns and .opencode/skills/immutable-patterns in your project.
What does Immutable Patterns need to run?
SKILL.md names no scripts, command-line tools or credentials: Immutable Patterns is instructions for the agent only.
Does Immutable Patterns 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 Immutable Patterns 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 Immutable Patterns use?
Immutable Patterns 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 Immutable Patterns use?
About 505 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 947 tokens, read only when the agent opens those files.
What are the alternatives to Immutable Patterns?
Skills that share tags, products or a category with Immutable Patterns: Triage Support Bundle (netdata/netdata, 81k stars), Analyzing Backend Bundle (TriliumNext/Trilium, 38k stars), Production Bundle Audit (keybase/client, 9.3k stars) and Create Paperclip Bundled Skill (paperclipai/paperclip, 98k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Immutable Patterns?
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.