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Kaj Kowalski
cd05fc8648
- Fix syntax errors in skills markdown files (.github/skills, .opencode/skills) - Change typescript to tsx for code blocks with JSX - Replace ellipsis (...) in array examples with valid syntax - Separate CSS from TypeScript into distinct code blocks - Convert JavaScript object examples to valid JSON in docs - Fix enum definitions with proper comma separation
732 B
732 B
title, impact, impactDescription, tags
| title | impact | impactDescription | tags |
|---|---|---|---|
| Subscribe to Derived State | MEDIUM | reduces re-render frequency | rerender, derived-state, media-query, optimization |
Subscribe to Derived State
Subscribe to derived boolean state instead of continuous values to reduce re-render frequency.
Incorrect (re-renders on every pixel change):
function Sidebar() {
const width = useWindowWidth(); // updates continuously
const isMobile = width < 768;
return <nav className={isMobile ? "mobile" : "desktop"} />;
}
Correct (re-renders only when boolean changes):
function Sidebar() {
const isMobile = useMediaQuery("(max-width: 767px)");
return <nav className={isMobile ? "mobile" : "desktop"} />;
}