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***************************************************************************** */


/// <reference lib="es2018.intl" />

declare namespace Intl {
    /**
     * The locale matching algorithm to use.
     *
     * [MDN](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Intl#Locale_negotiation).
     */
    type DurationFormatLocaleMatcher = "lookup" | "best fit";

    /**
     * The style of the formatted duration.
     *
     * [MDN](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Intl/DurationFormat/DurationFormat#style).
     */
    type DurationFormatStyle = "long" | "short" | "narrow" | "digital";

    /**
     * Whether to always display a unit, or only if it is non-zero.
     *
     * [MDN](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Intl/DurationFormat/DurationFormat#display).
     */
    type DurationFormatDisplayOption = "always" | "auto";

    /**
     * Value of the `unit` property in duration objects
     *
     * [MDN](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Intl/DurationFormat/format#duration).
     */
    type DurationFormatUnit =
        | "years"
        | "months"
        | "weeks"
        | "days"
        | "hours"
        | "minutes"
        | "seconds"
        | "milliseconds"
        | "microseconds"
        | "nanoseconds";

    type DurationFormatUnitSingular =
        | "year"
        | "month"
        | "week"
        | "day"
        | "hour"
        | "minute"
        | "second"
        | "millisecond"
        | "microsecond"
        | "nanosecond";

    /**
     * An object representing the relative time format in parts
     * that can be used for custom locale-aware formatting.
     *
     * [MDN](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Intl/DurationFormat/formatToParts).
     */
    type DurationFormatPart =
        | {
            type: "literal";
            value: string;
            unit?: DurationFormatUnitSingular;
        }
        | {
            type: Exclude<NumberFormatPartTypes, "literal">;
            value: string;
            unit: DurationFormatUnitSingular;
        };

    /**
     * An object with some or all properties of the `Intl.DurationFormat` constructor `options` parameter.
     *
     * [MDN](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Intl/DurationFormat/DurationFormat#parameters)
     */
    interface DurationFormatOptions {
        localeMatcher?: DurationFormatLocaleMatcher | undefined;
        numberingSystem?: string | undefined;
        style?: DurationFormatStyle | undefined;
        years?: "long" | "short" | "narrow" | undefined;
        yearsDisplay?: DurationFormatDisplayOption | undefined;
        months?: "long" | "short" | "narrow" | undefined;
        monthsDisplay?: DurationFormatDisplayOption | undefined;
        weeks?: "long" | "short" | "narrow" | undefined;
        weeksDisplay?: DurationFormatDisplayOption | undefined;
        days?: "long" | "short" | "narrow" | undefined;
        daysDisplay?: DurationFormatDisplayOption | undefined;
        hours?: "long" | "short" | "narrow" | "numeric" | "2-digit" | undefined;
        hoursDisplay?: DurationFormatDisplayOption | undefined;
        minutes?: "long" | "short" | "narrow" | "numeric" | "2-digit" | undefined;
        minutesDisplay?: DurationFormatDisplayOption | undefined;
        seconds?: "long" | "short" | "narrow" | "numeric" | "2-digit" | undefined;
        secondsDisplay?: DurationFormatDisplayOption | undefined;
        milliseconds?: "long" | "short" | "narrow" | "numeric" | undefined;
        millisecondsDisplay?: DurationFormatDisplayOption | undefined;
        microseconds?: "long" | "short" | "narrow" | "numeric" | undefined;
        microsecondsDisplay?: DurationFormatDisplayOption | undefined;
        nanoseconds?: "long" | "short" | "narrow" | "numeric" | undefined;
        nanosecondsDisplay?: DurationFormatDisplayOption | undefined;
        fractionalDigits?: 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | undefined;
    }

    /**
     * The Intl.DurationFormat object enables language-sensitive duration formatting.
     *
     * [MDN](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Intl/DurationFormat)
     */
    interface DurationFormat {
        /**
         * @param duration The duration object to be formatted. It should include some or all of the following properties: months, weeks, days, hours, minutes, seconds, milliseconds, microseconds, nanoseconds.
         *
         * [MDN](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Intl/DurationFormat/format).
         */
        format(duration: Partial<Record<DurationFormatUnit, number>>): string;
        /**
         * @param duration The duration object to be formatted. It should include some or all of the following properties: months, weeks, days, hours, minutes, seconds, milliseconds, microseconds, nanoseconds.
         *
         * [MDN](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Intl/DurationFormat/formatToParts).
         */
        formatToParts(duration: Partial<Record<DurationFormatUnit, number>>): DurationFormatPart[];
        /**
         * [MDN](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Intl/DurationFormat/resolvedOptions).
         */
        resolvedOptions(): ResolvedDurationFormatOptions;
    }

    interface ResolvedDurationFormatOptions {
        locale: UnicodeBCP47LocaleIdentifier;
        numberingSystem: string;
        style: DurationFormatStyle;
        years: "long" | "short" | "narrow";
        yearsDisplay: DurationFormatDisplayOption;
        months: "long" | "short" | "narrow";
        monthsDisplay: DurationFormatDisplayOption;
        weeks: "long" | "short" | "narrow";
        weeksDisplay: DurationFormatDisplayOption;
        days: "long" | "short" | "narrow";
        daysDisplay: DurationFormatDisplayOption;
        hours: "long" | "short" | "narrow" | "numeric" | "2-digit";
        hoursDisplay: DurationFormatDisplayOption;
        minutes: "long" | "short" | "narrow" | "numeric" | "2-digit";
        minutesDisplay: DurationFormatDisplayOption;
        seconds: "long" | "short" | "narrow" | "numeric" | "2-digit";
        secondsDisplay: DurationFormatDisplayOption;
        milliseconds: "long" | "short" | "narrow" | "numeric";
        millisecondsDisplay: DurationFormatDisplayOption;
        microseconds: "long" | "short" | "narrow" | "numeric";
        microsecondsDisplay: DurationFormatDisplayOption;
        nanoseconds: "long" | "short" | "narrow" | "numeric";
        nanosecondsDisplay: DurationFormatDisplayOption;
        fractionalDigits?: 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9;
    }

    const DurationFormat: {
        prototype: DurationFormat;

        /**
         * @param locales A string with a BCP 47 language tag, or an array of such strings.
         *   For the general form and interpretation of the `locales` argument, see the [Intl](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Intl#locale_identification_and_negotiation)
         *   page.
         *
         * @param options An object for setting up a duration format.
         *
         * [MDN](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Intl/DurationFormat/DurationFormat).
         */
        new (locales?: LocalesArgument, options?: DurationFormatOptions): DurationFormat;

        /**
         * Returns an array containing those of the provided locales that are supported in display names without having to fall back to the runtime's default locale.
         *
         * @param locales A string with a BCP 47 language tag, or an array of such strings.
         *   For the general form and interpretation of the `locales` argument, see the [Intl](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Intl#locale_identification_and_negotiation)
         *   page.
         *
         * @param options An object with a locale matcher.
         *
         * @returns An array of strings representing a subset of the given locale tags that are supported in display names without having to fall back to the runtime's default locale.
         *
         * [MDN](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Intl/DurationFormat/supportedLocalesOf).
         */
        supportedLocalesOf(locales?: LocalesArgument, options?: { localeMatcher?: DurationFormatLocaleMatcher; }): UnicodeBCP47LocaleIdentifier[];
    };
}