import { Transform } from 'stream';
import { ProgressInfo } from '../types';
/**
 * A Transform stream that merges multiple JSON files into a single JSON array
 */
export declare class JsonStreamMerger extends Transform {
    private isFirstFile;
    private processedBytes;
    totalBytes: number;
    private startTime;
    private onProgress;
    private arrayStartWritten;
    private isInterrupted;
    private lastChar;
    private buffer;
    constructor(options?: {
        onProgress?: (info: ProgressInfo) => void;
    });
    /**
     * Process a chunk of data
     */
    _transform(chunk: Buffer, encoding: string, callback: (error?: Error | null) => void): void;
    /**
     * Write the opening array bracket if not already written
     */
    private _writeArrayStart;
    /**
     * Process a chunk of text data
     */
    private _processChunk;
    /**
     * Check if a line should be skipped
     */
    private _shouldSkipLine;
    /**
     * Write a line with proper formatting
     */
    private _writeLine;
    /**
     * Report progress information
     */
    private _reportProgress;
    /**
     * Flush any remaining data
     */
    _flush(callback: (error?: Error | null) => void): void;
    /**
     * Handle stream destruction
     */
    _destroy(err: Error | null, callback: (error: Error | null) => void): void;
}