/**
 * Intersection Observer Action for Scroll-Triggered Animations
 *
 * Svelte action that triggers animations when elements scroll into view.
 * Embodies "the tool recedes" - animation feels natural, not forced.
 *
 * Usage:
 *   <div use:inview={{ threshold: 0.3 }} on:inview={handleInView}>
 *
 * Or with the helper:
 *   <div use:inview on:inview={() => visible = true}>
 */
export type InViewOptions = {
    /** Percentage of element visible before triggering (0-1) */
    threshold?: number;
    /** Root margin for earlier/later trigger */
    rootMargin?: string;
    /** Only trigger once (default: true) */
    once?: boolean;
};
/**
 * Svelte action for intersection observer
 */
export declare function inview(node: HTMLElement, options?: InViewOptions): {
    destroy(): void;
    update(newOptions: InViewOptions): void;
};
/**
 * Helper to create a reactive visible state
 */
export declare function createInViewState(): {
    readonly visible: boolean;
    onInView(): void;
    reset(): void;
};