import { LitElement } from 'lit';
/**
 * USA Error Template
 *
 * Error page template for 404, 500, and other error states.
 * Provides a minimal, focused layout for error messaging.
 *
 * **Template Structure (from USWDS):**
 * - Skip navigation + Banner + Header (optional)
 * - Error content with code, title, message
 * - Action buttons (home link, etc.)
 * - Footer + Identifier (optional)
 *
 * @element usa-error-template
 *
 * @slot error-content - Custom error content
 * @slot header - Site header
 * @slot footer - Site footer
 *
 * @fires {CustomEvent} template-ready - Fired when template initializes
 *
 * @example 404 Error
 * ```html
 * <usa-error-template
 *   error-code="404"
 *   error-title="Page not found"
 *   error-message="We couldn't find the page you're looking for."
 *   home-url="/"
 *   home-text="Return to home"
 * ></usa-error-template>
 * ```
 *
 * @example 500 Error
 * ```html
 * <usa-error-template
 *   error-code="500"
 *   error-title="Server error"
 *   error-message="Something went wrong. Please try again later."
 *   show-contact
 *   contact-url="/contact"
 * ></usa-error-template>
 * ```
 *
 * @uswds-template https://designsystem.digital.gov/templates/error-page/
 */
export declare class USAErrorTemplate extends LitElement {
    protected createRenderRoot(): this;
    /**
     * Page language attribute
     */
    lang: string;
    /**
     * Whether to show the government banner
     */
    showBanner: boolean;
    /**
     * Whether to show the identifier at the bottom
     */
    showIdentifier: boolean;
    /**
     * Error code (e.g., "404", "500")
     */
    errorCode: string;
    /**
     * Error title/heading
     */
    errorTitle: string;
    /**
     * Error description message
     */
    errorMessage: string;
    /**
     * Home page URL
     */
    homeUrl: string;
    /**
     * Home button text
     */
    homeText: string;
    /**
     * Whether to show a contact link
     */
    showContact: boolean;
    /**
     * Contact page URL
     */
    contactUrl: string;
    /**
     * Contact link text
     */
    contactText: string;
    /**
     * Additional help text
     */
    helpText: string;
    connectedCallback(): void;
    firstUpdated(changedProperties: Map<string, any>): void;
    /**
     * Check if a slot has content
     */
    private hasSlotContent;
    /**
     * Render the error content
     */
    private renderErrorContent;
    render(): import('lit-html').TemplateResult<1>;
    /**
     * Public API: Set error state
     */
    setError(code: string, title: string, message: string): void;
}
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