import { AnnouncementPriority } from '../types';
/**
 * Generate contextual ARIA label for loaders
 */
export declare function generateAriaLabel(componentName: string, options?: {
    progress?: number;
    status?: string;
    estimatedTime?: number;
}): string;
/**
 * Determine if a progress value should trigger an announcement
 */
export declare function shouldAnnounceProgress(currentProgress: number, previousProgress: number, milestones?: number[], minInterval?: number): boolean;
/**
 * Get announcement message for progress updates
 */
export declare function getProgressAnnouncement(progress: number, options?: {
    taskName?: string;
    includeTimeEstimate?: boolean;
    estimatedSeconds?: number;
}): string;
/**
 * Determine politeness level based on priority
 */
export declare function getPolitenessLevel(priority: AnnouncementPriority): 'polite' | 'assertive';
/**
 * Queue for managing announcements to prevent overwhelming screen readers
 */
export declare class AnnouncementQueue {
    private queue;
    private isProcessing;
    private readonly minDelay;
    /**
     * Add an announcement to the queue
     */
    add(message: string, priority?: AnnouncementPriority): void;
    /**
     * Process the announcement queue
     */
    private processQueue;
    /**
     * Announce a message (to be implemented by consumer)
     */
    private announce;
    /**
     * Clear all pending announcements
     */
    clear(): void;
    /**
     * Get queue length
     */
    getLength(): number;
}
/**
 * Singleton announcement queue instance
 */
export declare const announcementQueue: AnnouncementQueue;
/**
 * Helper to announce loading state changes
 */
export declare function announceLoadingState(state: 'start' | 'progress' | 'success' | 'error', options?: {
    taskName?: string;
    progress?: number;
    errorMessage?: string;
    priority?: AnnouncementPriority;
}): void;
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