export type DateTimeFormatOptions = Intl.DateTimeFormatOptions;

export interface ZoneOptions {
    /**
     * If true, adjust the underlying time so that the local time stays the same, but in the target zone.
     * You should rarely need this.
     * Defaults to false.
     */
    keepLocalTime?: boolean | undefined;
    /**
     * @deprecated since 0.2.12. Use keepLocalTime instead
     */
    keepCalendarTime?: boolean | undefined;
}

/** @deprecated */
export type EraLength = StringUnitLength;

export type NumberingSystem = Intl.DateTimeFormatOptions extends { numberingSystem?: infer T } ? T
    :
        | "arab"
        | "arabext"
        | "bali"
        | "beng"
        | "deva"
        | "fullwide"
        | "gujr"
        | "guru"
        | "hanidec"
        | "khmr"
        | "knda"
        | "laoo"
        | "latn"
        | "limb"
        | "mlym"
        | "mong"
        | "mymr"
        | "orya"
        | "tamldec"
        | "telu"
        | "thai"
        | "tibt";

export type CalendarSystem = Intl.DateTimeFormatOptions extends { calendar?: infer T } ? T
    :
        | "buddhist"
        | "chinese"
        | "coptic"
        | "ethioaa"
        | "ethiopic"
        | "gregory"
        | "hebrew"
        | "indian"
        | "islamic"
        | "islamicc"
        | "iso8601"
        | "japanese"
        | "persian"
        | "roc";

export type HourCycle = "h11" | "h12" | "h23" | "h24";

export type StringUnitLength = "narrow" | "short" | "long";
export type NumberUnitLength = "numeric" | "2-digit";
export type UnitLength = StringUnitLength | NumberUnitLength;