client-event-listeners

Use useSWRSubscription() to share global event listeners across component instances.

Skills
Web development
0

What it does and how to use it

A skill that teaches Claude Code to do web development tasks well. It is packaged knowledge the model uses whenever it is relevant.

Install the skill (command above).
In Claude Code, describe what you need - the skill turns on by itself when the context fits.
No commands to memorize: you talk in plain language and the skill does the rest.

Install (Claude Code)

mkdir -p .claude/skills/client-event-listeners && curl -fsSL https://doutorai.pt/data/lib/skills__client-event-listeners.md -o .claude/skills/client-event-listeners/SKILL.md

Paste this command into the terminal, in your project folder, and the component installs automatically.

Content

---
title: Deduplicate Global Event Listeners
impact: MEDIUM-HIGH
impactDescription: single listener for N components
tags: client, swr, event-listeners, subscription
---

## Deduplicate Global Event Listeners

Use `useSWRSubscription()` to share global event listeners across component instances.

**Incorrect (N instances = N listeners):**

```tsx
function useKeyboardShortcut(key: string, callback: () => void) {
  useEffect(() => {
    const handler = (e: KeyboardEvent) => {
      if (e.metaKey && e.key === key) {
        callback()
      }
    }
    window.addEventListener('keydown', handler)

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