Utilities
Hooks, libraries, pages, files, themes, fonts, bases, styles, and other items.
Color ContrastWCAG contrast ratios and readable text color selection, with no dependencies.FormatLocale-aware formatters for dates, ranges, currency, numbers, and durations.useControllableStateA hook that makes any component work controlled or uncontrolled from one state API.useCopyToClipboardA small hook that copies text and tracks the latest copy result.useDebouncedValueA hook that defers a rapidly changing value until it settles.useEventListenerA hook that attaches a typed event listener with automatic cleanup.useFileUploadA hook that manages file selection, validation, previews, and upload progress.useHotkeysA hook that binds keyboard shortcuts with modifier and sequence support.useIntersectionObserverA hook that tracks whether an element is in the viewport.useLocalStorageA hook that persists state to localStorage and syncs it across tabs.useMediaQueryA hook that tracks a CSS media query without tearing during hydration.useMountedA hook that reports whether the component has mounted on the client.usePreviousA hook that remembers the value from before the most recent change.useResizeObserverA hook that measures an element and updates on resize.useScrollLockA hook that locks body scroll without layout shift.