Dejank

Detect and diagnose visual jank in React UIs. Covers two modes -- static analysis of code patterns that cause flicker, layout shift, and flash of intermediate state (for pre-merge review or preventive sweeps), and runtime investigation of specific visual symptoms (flicker, blink, jump, stutter, remount churn, scroll reset, post-paint correction). Use when the user mentions jank, something feeling off, flashing, blinking, layout shifting, full repaints, or wants a render stability audit.

31 starsFrontend & Design

Install

skills CLI (Claude Code, Cursor, Codex and more)

npx skills add gbasin/dejank --skill dejank

Manual install

git clone --depth 1 https://github.com/gbasin/dejank.git /tmp/dejank
mkdir -p ~/.claude/skills
cp -r /tmp/dejank/. ~/.claude/skills/dejank

Personal skills live in ~/.claude/skills. Use .claude/skills in a project folder to share a skill with your team.

From the SKILL.md

Find and fix visual instability in React and browser UIs. This skill operates in two modes depending on what is known at invocation time.

## Decision Tree

Determine the mode before doing any work:

**Is there a specific visual complaint?** (The user describes something they can see: flicker, blink, flash, jump, stutter, pop-in, scroll reset, focus loss, "the whole pane feels rebuilt.")

- **Yes** -- go to **Mode B: Runtime Investigation**
- **No** (general review, PR check, preventive sweep, or just a file/directory target) -- go to **Mode A: Static Analysis**

If unsure, start with Mode A. Its findings often explain the complaint without runtime tooling.

---

## Mode A -- Static Analysis

Use when: reviewing a PR, scanning changed files, doing a preventive sweep, or no specific symptom is reported.

1. Read [references/static-patterns.md](./references/static-patterns.md) for the full pattern catalog.
2. Read [references/scan-process.md](./references/scan-process.md) for scope rules, severity rubric, output format, and guardrails.
3. Identify scope: changed files in the current branch (`git diff --name-only` against base), or the user-specified target and its direct imports.
4. Scan each React component against all patterns.
5. Report findings grouped by component, ranked by severity.

Stop here unless a finding warrants runtime confirmation or the user escalates.

---

## Mode B -- Runtime Investigation

Read the full skill on GitHub

Details

Skill name: dejank
Repository: gbasin/dejank
Repo updated: 27 March 2026

FAQ

What does the Dejank skill do?

How do I install the Dejank skill?

skills CLI (Claude Code, Cursor, Codex and more): npx skills add gbasin/dejank --skill dejank. Skills go in ~/.claude/skills (personal) or .claude/skills (project), and Claude loads them automatically when a task matches the description.

Is Dejank popular?

It lives in gbasin/dejank, which has 31 GitHub stars and 0 forks.

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