/**
 * Write batcher for optimizing file I/O operations
 * Collects multiple file writes and executes them in batches to reduce I/O overhead
 */
export declare class WriteBatcher {
    private writeQueue;
    private readonly batchSize;
    private readonly batchDelay;
    private flushTimer;
    private flushing;
    constructor(batchSize?: number, batchDelay?: number);
    /**
     * Add a file write to the batch queue
     */
    addWrite(fileName: string, data: string): Promise<void>;
    /**
     * Flush all pending writes
     */
    flush(): Promise<void>;
    /**
     * Get the current queue length
     */
    getQueueLength(): number;
    /**
     * Get queue statistics for visualization
     */
    getQueueStats(): {
        queueLength: number;
        batchSize: number;
        isFlushing: boolean;
    };
    /**
     * Schedule the next flush (extracted for testability)
     * This method is called from the setTimeout callback to handle errors
     * @private
     */
    private scheduleNextFlush;
    /**
     * Test helper to check if flush timer is set
     * This is only used in tests to verify timer scheduling for coverage
     * @returns true if flush timer is set, false otherwise
     */
    hasFlushTimer(): boolean;
    /**
     * Flush all remaining writes in batches (for final flush)
     * Processes writes in chunks to avoid EMFILE (too many open files) errors
     */
    flushAll(): Promise<void>;
    /**
     * Wait for all pending writes to complete
     * More aggressive flushing to prevent blocking
     */
    waitForCompletion(): Promise<void>;
}
/**
 * Serialize JSON to YAML or JSON string
 */
export declare function serializeData(json: unknown, format: string): string;
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