/**
 * Priority queue for indexing tasks
 */
import type { IndexingTask } from './types.js';
/**
 * Priority-based indexing queue
 */
export declare class IndexingQueue {
    private queue;
    private processing;
    private maxRetries;
    constructor(maxRetries?: number);
    /**
     * Add task to queue
     */
    add(file: string, priority?: number, reason?: IndexingTask['reason']): void;
    /**
     * Add multiple tasks
     */
    addBatch(files: string[], priority?: number, reason?: IndexingTask['reason']): void;
    /**
     * Get next task from queue
     */
    next(): IndexingTask | null;
    /**
     * Get multiple tasks for batch processing
     */
    nextBatch(count: number): IndexingTask[];
    /**
     * Mark task as completed
     */
    complete(file: string): void;
    /**
     * Mark task as failed and retry or remove
     */
    fail(file: string, error: string): void;
    /**
     * Remove task from queue
     */
    remove(file: string): boolean;
    /**
     * Check if file is in queue or processing
     */
    has(file: string): boolean;
    /**
     * Check if file is currently being processed
     */
    isProcessing(file: string): boolean;
    /**
     * Get queue size
     */
    size(): number;
    /**
     * Get number of files being processed
     */
    processingCount(): number;
    /**
     * Get all files in queue
     */
    getFiles(): string[];
    /**
     * Clear queue
     */
    clear(): void;
    /**
     * Sort queue by priority (highest first)
     */
    private sortQueue;
    /**
     * Get queue statistics
     */
    getStats(): {
        queueSize: number;
        processing: number;
        retrying: number;
        byReason: Record<string, number>;
    };
}
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