/** Margen mínimo respecto a los bordes del viewport (px). */
export declare const DATE_PICKER_VIEWPORT_MARGIN = 8;
export declare const DATE_PICKER_PORTAL_WIDTH = 256;
export interface DatePickerPortalLayoutInput {
    inputRect: DOMRectReadOnly;
    viewportWidth: number;
    viewportHeight: number;
    portalWidth: number;
    portalHeight: number;
    margin?: number;
}
/**
 * Calcula top/left del portal del DatePicker en coordenadas de viewport.
 * Si cabe debajo del input, se ancla ahí con `margin`. Si no, se voltea arriba con el mismo gap.
 */
export declare function computeDatePickerPortalPosition({ inputRect, viewportWidth, viewportHeight, portalWidth, portalHeight, margin, }: DatePickerPortalLayoutInput): {
    top: number;
    left: number;
};
export declare function getEstimatedDatePickerPortalHeight(options: {
    timeVisible: boolean;
    calendarsCount?: number;
    mode?: 'single' | 'range';
}): number;
/** Mide el panel del portal; ignora lecturas inválidas o del tamaño del viewport entero. */
export declare function measureDatePickerPortalSize(portalEl: HTMLElement, viewportHeight?: number): {
    width: number;
    height: number;
} | null;
export declare function isValidPortalHeightForLayout(portalHeight: number, viewportHeight: number): boolean;
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