import { LitElement } from 'lit';
/**
 * Form step interface
 */
export interface FormStep {
    label: string;
    status?: 'complete' | 'current' | 'incomplete';
}
/**
 * USA Form Template
 *
 * Multi-step form page template following USWDS patterns.
 * Supports step indicators, form sections, and progress tracking.
 *
 * **Template Structure (from USWDS):**
 * - Skip navigation + Banner + Header
 * - Optional step indicator
 * - Form content area (patterns/components)
 * - Action buttons (next, back, submit)
 * - Optional sidebar
 * - Footer + Identifier
 *
 * @element usa-form-template
 *
 * @slot form-header - Content above the form (title, intro)
 * @slot form-content - Form fields and patterns
 * @slot form-actions - Submit/navigation buttons
 * @slot form-sidebar - Optional sidebar content
 * @slot header - Site header
 * @slot footer - Site footer
 *
 * @fires {CustomEvent} form-submit - Fired when form is submitted
 * @fires {CustomEvent} step-change - Fired when step changes
 * @fires {CustomEvent} template-ready - Fired when template initializes
 *
 * @example Basic single-step form
 * ```html
 * <usa-form-template
 *   heading="Contact Information"
 * >
 *   <div slot="form-content">
 *     <usa-name-pattern></usa-name-pattern>
 *     <usa-email-address-pattern></usa-email-address-pattern>
 *   </div>
 * </usa-form-template>
 * ```
 *
 * @example Multi-step form with step indicator
 * ```html
 * <usa-form-template
 *   heading="Application"
 *   show-step-indicator
 *   current-step="2"
 *   total-steps="4"
 *   .steps="${[
 *     { label: 'Personal Info', status: 'complete' },
 *     { label: 'Contact', status: 'current' },
 *     { label: 'Review', status: 'incomplete' },
 *     { label: 'Submit', status: 'incomplete' }
 *   ]}"
 * >
 *   <div slot="form-content">...</div>
 * </usa-form-template>
 * ```
 *
 * @uswds-template https://designsystem.digital.gov/templates/form-templates/
 */
export declare class USAFormTemplate 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;
    /**
     * Form heading/title
     */
    heading: string;
    /**
     * Form subheading/description
     */
    subheading: string;
    /**
     * Whether to show step indicator
     */
    showStepIndicator: boolean;
    /**
     * Current step number (1-based)
     */
    currentStep: number;
    /**
     * Total number of steps
     */
    totalSteps: number;
    /**
     * Step labels and statuses
     */
    steps: FormStep[];
    /**
     * Whether to center the step indicator labels
     */
    centerStepLabels: boolean;
    /**
     * Whether to show sidebar
     */
    showSidebar: boolean;
    /**
     * Sidebar position
     */
    sidebarPosition: 'left' | 'right';
    /**
     * Submit button text
     */
    submitText: string;
    /**
     * Back button text
     */
    backText: string;
    /**
     * Next button text
     */
    nextText: string;
    /**
     * Whether to show back button
     */
    showBackButton: boolean;
    /**
     * Form action URL
     */
    actionUrl: string;
    /**
     * Form method
     */
    method: string;
    /**
     * Form validation state
     */
    private isValid;
    connectedCallback(): void;
    firstUpdated(changedProperties: Map<string, any>): void;
    /**
     * Handle form submission
     */
    private handleSubmit;
    /**
     * Handle back button click
     */
    private handleBack;
    /**
     * Check if a slot has content
     */
    private hasSlotContent;
    /**
     * Render step indicator
     */
    private renderStepIndicator;
    /**
     * Render form actions
     */
    private renderFormActions;
    /**
     * Render form content area
     */
    private renderFormContent;
    /**
     * Render sidebar
     */
    private renderSidebar;
    render(): import('lit-html').TemplateResult<1>;
    /**
     * Public API: Go to next step
     */
    nextStep(): void;
    /**
     * Public API: Go to previous step
     */
    previousStep(): void;
    /**
     * Public API: Go to specific step
     */
    goToStep(step: number): void;
    /**
     * Public API: Set step status
     */
    setStepStatus(stepIndex: number, status: 'complete' | 'current' | 'incomplete'): void;
    /**
     * Public API: Get form element
     */
    getForm(): HTMLFormElement | null;
    /**
     * Public API: Validate form
     */
    validateForm(): boolean;
}
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