export interface VisualViewportPinOptions {
    /** Which layout-viewport edge the element is pinned to (default `'top'`).
     *  The hook assumes the element's untransformed position IS that edge —
     *  true for `fixed` bars, and for `sticky` bars while stuck. */
    edge?: 'top' | 'bottom';
    /** Suspend pinning and hand the transform back to CSS — e.g. while a
     *  `sticky="scroll-up"` header is hidden by its own translate. */
    disabled?: boolean;
}
/**
 * Keeps a fixed/sticky bar glued to the visual viewport while the user
 * pinch-zooms or pans, so persistent chrome (and the CTA it carries) never
 * leaves the visible screen. Returns a callback ref — attach it to the bar
 * (composable via `composeRefs`); late-mounting and remounting nodes re-pin
 * automatically.
 *
 * The pin engages only under real pinch-zoom (`visualViewport.scale > 1`):
 * keyboard-driven viewport shrink (scale stays 1) and desktop scrollbar
 * deltas never move the bar. Deliberate 1.4.4 trade-off: counter-scaled
 * chrome cannot itself be magnified by pinch-zoom — its text sizes through
 * rem tokens and OS text-size settings instead, while the pin keeps the
 * controls reachable (a net gain for zoom accessibility).
 *
 * Writes `transform` / `transform-origin` imperatively (per-frame viewport
 * geometry cannot be expressed as static classes) and suppresses the
 * element's own transitions only while a pin is applied, so the bar tracks
 * the viewport without transition lag. All geometry is in physical viewport
 * coordinates by nature — this is not layout CSS, so the logical-properties
 * rule does not apply.
 */
export declare function useVisualViewportPin<T extends HTMLElement>({ edge, disabled, }?: VisualViewportPinOptions): (node: T | null) => void;
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