import { LogTransport, LogEntry, LogLevel, LogFormatter, FileTransportOptions } from '../types';
/**
 * File transport for writing logs to disk with rotation support
 */
export declare class FileTransport implements LogTransport {
    name: string;
    level: LogLevel;
    private formatter;
    private filename;
    private maxSize;
    private maxFiles;
    private createDir;
    private currentSize;
    private writeStream?;
    private writeQueue;
    private isWriting;
    constructor(options: FileTransportOptions);
    /**
     * Initializes the file transport
     */
    private init;
    /**
     * Ensures directory exists and stream is ready for writing
     */
    private ensureReady;
    /**
     * Creates a new write stream
     */
    private createWriteStream;
    write(entry: LogEntry): Promise<void>;
    /**
     * Processes the write queue asynchronously
     */
    private processWriteQueue;
    /**
     * Writes data to the stream
     */
    private writeToStream;
    /**
     * Rotates log files when max size is reached
     */
    private rotateFile;
    /**
     * Rotates existing log files
     */
    private rotateExistingFiles;
    /**
     * Closes a write stream gracefully
     */
    private closeStream;
    flush(): Promise<void>;
    close(): Promise<void>;
    /**
     * Gets current file size
     */
    getCurrentSize(): number;
    /**
     * Gets current filename
     */
    getFilename(): string;
    /**
     * Sets a new formatter
     */
    setFormatter(formatter: LogFormatter): void;
}
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