import dayjs from 'dayjs';
import 'dayjs/locale/en-gb';
/**
 * Maps BCP-47 tags to dayjs locale ids (lowercase, e.g. `fr-FR` → `fr-fr`).
 * English variants map to dayjs bundles: `en-US` → `en`, `en-GB` → `en-gb`.
 * @public
 */
export declare function resolveDayjsLocale(lang: string): string;
/**
 * Browser BCP-47 locale (e.g. `en-GB`), or `en` when unavailable (SSR/tests).
 * @public
 */
export declare function getBrowserLocale(): string;
/**
 * Display format from dayjs locale `L` (e.g. en / en-US → MM/DD/YYYY, en-gb → DD/MM/YYYY).
 * Falls back to `en` when the locale is not loaded in dayjs (import the matching `dayjs/locale/*` bundle).
 * @public
 */
export declare function getDisplayFormatForLang(lang?: string): string;
/**
 * Maps a dayjs-style display format to a lowercase placeholder hint (e.g. DD/MM/YYYY → dd/mm/yyyy).
 * @public
 */
export declare function formatToPlaceholder(format: string): string;
export declare function hasDateValue(value: string | null | undefined): boolean;
/**
 * Internal wire format for the date picker's `value` attribute.
 * Display formatting is independent (see `format` / `getDisplayFormatForLang`).
 * @public
 */
export declare const DATE_PICKER_VALUE_FORMAT = "MM-DD-YYYY";
/**
 * Strictly parses a date picker value (`displayFormat` or internal `DATE_PICKER_VALUE_FORMAT`). Returns null when invalid.
 * @public
 */
export declare function parseDatePickerValue(dateString: string, displayFormat: string): dayjs.Dayjs | null;
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