import { Temporal } from "@js-temporal/polyfill";
export type EthiopicFamilyCalendar = "ethiopic" | "ethiopic-amete-alem" | "coptic";
export declare function isEthiopicFamilyCalendar(value: string): value is EthiopicFamilyCalendar;
export interface EthiopicFamilyFields {
    year: number;
    era?: "ethioaa" | "ethiopic";
    eraYear?: number;
    month: number;
    day: number;
}
/**
 * Derive an Ethiopic-family calendar's native year/month/day (+ era, for "ethiopic") from a
 * Temporal.PlainDate, via Temporal's ICU-independent "ethioaa" calendar rather than the
 * target's own native calendar id. See the module comment above for why.
 */
export declare function ethiopicFamilyFieldsFromDate(date: Temporal.PlainDate, calendar: EthiopicFamilyCalendar): EthiopicFamilyFields;
/**
 * Construct a Temporal.PlainDate from an Ethiopic-family calendar's native fields, backed
 * by Temporal's "ethioaa" calendar rather than the target's own native calendar id. Throws
 * on an unrecognized era or a missing required field — callers wrap this in try-catch per
 * GMT's sentinel-return contract. See the module comment above for why.
 */
export declare function dateFromEthiopicFamilyFields(calendar: EthiopicFamilyCalendar, fields: {
    year?: number;
    era?: string;
    eraYear?: number;
    month: number;
    day: number;
}): Temporal.PlainDate;
/**
 * Split a Temporal.PlainDate into GMT's calendar-annotated string halves for an Ethiopic-family
 * calendar, mirroring `calendarDateParts`' shape for the rest of the calendar systems but
 * routed entirely through `ethiopicFamilyFieldsFromDate` — see the module comment above.
 *
 * Returned as `{ date, annotation }` rather than one string so the zoned grammar can splice its
 * time/offset between the two halves — see `calendarDateParts`' doc comment for why.
 */
export declare function ethiopicFamilyDateParts(date: Temporal.PlainDate, calendar: EthiopicFamilyCalendar): {
    date: string;
    annotation: string;
};
/**
 * Format a Temporal.PlainDate as GMT's calendar-annotated string for an Ethiopic-family
 * calendar, mirroring `formatCalendarDate`'s shape for the rest of the calendar systems but
 * routed entirely through `ethiopicFamilyFieldsFromDate` — see the module comment above.
 */
export declare function formatEthiopicFamilyDate(date: Temporal.PlainDate, calendar: EthiopicFamilyCalendar): string;