import type { Instance } from 'flatpickr/dist/types/instance';
import type { Hook } from 'flatpickr/dist/types/options';
/**
 * - offset: gap between input and calendar
 * - minViewportMargin: padding from viewport edges
 * - preferTop: bias toward opening upward when space is tight
 */
type FixedOverlayPositionOpts = {
    offset?: number;
    minViewportMargin?: number;
    preferTop?: boolean;
};
type FPPlugin = (fp: Instance) => {
    onReady?: Hook;
};
/**
 * Flatpickr plugin that positions the calendar using viewport-fixed coordinates.
 *  - detects modal/overlay contexts
 *  - tracks scroll/resize sources (including shadow DOM hosts) and repositions.
 *  - flips above the input when space below is insufficient.
 */
export declare function fixedOverlayPositionPlugin(opts?: FixedOverlayPositionOpts): FPPlugin;
export {};
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