import { LitElement } from 'lit';
/**
 * @element nve-format-relative-time
 * @description Formats a date/time value as localized relative text using the Intl.RelativeTimeFormat API. Renders inside a semantic time element.
 * Options mirror the Intl.RelativeTimeFormat API. When unit is 'auto', the component selects the best unit based on the time difference.
 * @since 0.0.0
 * @entrypoint \@nvidia-elements/core/format-relative-time
 * @slot - Date string to format (such as 2023-07-28T04:20:17.434Z). Serves as fallback before hydration.
 */
export declare class FormatRelativeTime extends LitElement {
    #private;
    static styles: import('lit').CSSResult[];
    static readonly metadata: {
        tag: string;
        version: string;
    };
    /**
     * Optional date string for values supplied by JavaScript or bound data.
     * By default, the component formats the element's text content, which also serves as the SSR fallback.
     * When both are present, this property takes precedence.
     */
    date?: string;
    /**
     * Language tag (such as en-US, de-DE). Defaults to document.documentElement.lang or browser default.
     */
    locale?: string;
    /**
     * Numeric formatting: 'always' | 'auto'. When 'auto', enables natural language forms such as 'yesterday' instead of '1 day ago'.
     */
    numeric: 'always' | 'auto';
    /**
     * Formatting length: 'long' | 'short' | 'narrow'. Controls verbosity (such as '3 days ago' vs '3d ago'). Maps to Intl.RelativeTimeFormat style option.
     */
    formatStyle: 'long' | 'short' | 'narrow';
    /**
     * Time unit: 'second' | 'minute' | 'hour' | 'day' | 'week' | 'month' | 'year' | 'auto'. Use 'auto' to let the component select the most appropriate unit based on the time difference.
     */
    unit: 'second' | 'minute' | 'hour' | 'day' | 'week' | 'month' | 'year' | 'auto';
    /**
     * When present, auto-updates the displayed relative time at appropriate intervals.
     */
    sync: boolean;
    connectedCallback(): void;
    disconnectedCallback(): void;
    updated(changed: Map<string, unknown>): void;
    render(): import('lit').TemplateResult<1>;
}