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Old React

Category: Engineering  ·  Sub-category: architecture  ·  Last updated:
type:audittype:review
Use when reviewing or refactoring React code in pre-RSC projects (classes, hooks, Redux/MobX/observable, Reselect, Immer). Applies FP-thinking rules grounded in render purity, immutable updates, and the Elm Architecture (Model, Msg, update, view, Cmd, Sub). Triggers on phrases like "review my React code", "refactor this class component", "audit hooks usage", "review this reducer", or the slash command `/old-react`. Out of scope: React Server Components, the `use(promise)` hook, `'use client'` and `'use server'` boundaries.

About this skill (catalog notes)

Old React includes at least one code block. The SKILL.md runs to about 805 words, in the catalog's typical mid-range.

License
MIT
Original author
caasi
Indexed lastmod
Catalog position
Engineering · architecture
Indexed related skills
10

How Old React fits the catalog

Old React sits in the Engineering category under the architecture sub-topic in the ClaudSkills catalog. There are 10 related skills indexed alongside it; comparing a few before installing usually reveals which fits your workflow best.

These notes are auto-generated from features detected in the SKILL.md file and from this catalog's structure — they aren't part of the source repository.

From the source SKILL.md

Review and refactor pre-RSC React code using FP-thinking rules.

What this skill does

Old React is a community-contributed Claude Code skill in the architecture sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/old-react/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when reviewing or refactoring React code in pre-RSC projects (classes, hooks, Redux/MobX/observable, Reselect, Immer). Applies FP-thinking rules grounded in render purity, immutable updates, and the Elm Architecture (Model, Msg, update, view, Cmd, Sub).

Who uses this skill

The Old React Claude Code skill is built for software engineers, backend developers, full-stack teams, and technical leads building and maintaining production systems. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 116,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/old-react
curl -L https://claudskills.com/skills/old-react/SKILL.md \
  -o ~/.claude/skills/old-react/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/old-react/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/old-react/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\old-react\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Telegram

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Old React Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/old-react/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Old React skill do?
Use when reviewing or refactoring React code in pre-RSC projects (classes, hooks, Redux/MobX/observable, Reselect, Immer). Applies FP-thinking rules grounded in render purity, immutable updates, and the Elm Architecture (Model, Msg, update, view, Cmd, Sub). Triggers on phrases like "review my React code", "refactor this class component", "audit hooks usage", "review this reducer", or the slash command `/old-react`. Out of scope: React Server Components, the `use(promise)` hook, `'use client'` and `'use server'` boundaries.
Is this skill free to install?
Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.
When should I use the Old React skill?
Use Old React when your Claude Code task falls under the Engineering category — specifically in the architecture area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Old React" or describe the task and let Claude pick). Browse related skills at /category/engineering/.
What is a Claude Code skill and how does the Old React skill fit in?
A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Old React is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Engineering category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA
caasi. (2026). Old React [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/old-react/
BibTeX
@misc{old-react-2026,
  author    = {caasi},
  title     = {Old React [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/old-react/}
}

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