import { ReactiveController, ReactiveControllerHost } from 'lit';
/**
 * Options for ScrollController
 */
export interface ScrollControllerOptions {
    /** Scroll threshold in pixels for triggering state changes */
    threshold?: number;
    /** Callback when scroll passes threshold (scrolled down) */
    onScrolledDown?: () => void;
    /** Callback when scroll returns above threshold (scrolled up) */
    onScrolledUp?: () => void;
}
/**
 * Reactive Controller for scroll threshold detection.
 *
 * Provides:
 * - Threshold-based callbacks for scroll state changes
 * - scrollToTop() utility for navigation
 *
 * @example
 * ```typescript
 * class MyComponent extends LitElement {
 *   private scrollController = new ScrollController(this, {
 *     threshold: 380, // Teaser height
 *     onScrolledDown: () => this.teaserCollapsed = true,
 *     onScrolledUp: () => this.teaserCollapsed = false,
 *   });
 *
 *   render() {
 *     return html`
 *       <button @click=${() => this.scrollController.scrollToTop()}>
 *         Back to top
 *       </button>
 *     `;
 *   }
 * }
 * ```
 */
export declare class ScrollController implements ReactiveController {
    private _host;
    private _options;
    private _handler;
    private _ticking;
    private _isPastThreshold;
    private _teaserCollapseEnabled;
    constructor(host: ReactiveControllerHost, options?: ScrollControllerOptions);
    /**
     * Whether the scroll position is past the threshold
     */
    get isPastThreshold(): boolean;
    /**
     * Scroll to the top of the page smoothly
     */
    scrollToTop(): void;
    /**
     * Update the threshold value dynamically
     */
    setThreshold(threshold: number): void;
    /**
     * Enable/disable teaser collapse behavior.
     * When disabled, scroll threshold callbacks are not triggered.
     * Use this on pages without teaser to prevent scroll events from
     * incorrectly toggling teaserCollapsed state.
     */
    setTeaserCollapseEnabled(enabled: boolean): void;
    hostConnected(): void;
    hostDisconnected(): void;
    /**
     * Create the scroll handler with requestAnimationFrame throttling
     */
    private _createScrollHandler;
    /**
     * Check if threshold is crossed and trigger callbacks
     */
    private _checkThreshold;
}
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