import winston from "winston";
import type { LogEntry } from "../log-entry";
import type { LogLevel } from "../logger";
import { Writer } from "./base";
import type { BaseWriterParams } from "./base";
export interface FileWriterConfig extends BaseWriterParams {
    level: LogLevel;
    logFilePath: string;
    fileTransportOptions?: object;
    json?: boolean;
    truncatePrevious?: boolean;
}
type FileTransportOptions = winston.transports.FileTransportOptions;
export declare function render(level: LogLevel, entry: LogEntry): string | null;
export declare class FileWriter extends Writer {
    type: string;
    protected fileLogger: winston.Logger | null;
    protected logFilePath: string;
    protected fileTransportOptions: FileTransportOptions;
    constructor(config: FileWriterConfig);
    static factory(config: FileWriterConfig): Promise<FileWriter>;
    initFileLogger(): winston.Logger;
    render(entry: LogEntry): string | null;
    write(entry: LogEntry): void;
}
export {};