import * as NodeJSFileSystem from 'fs';
import { LogHandler } from '../handler';
import { LogRecord } from '../record';
declare type Encoder = (record: LogRecord) => string;
export declare const fileHandler: ({ fs, filename, writeOptions, format, }: {
    fs?: Pick<typeof NodeJSFileSystem.promises, "open" | "writeFile" | "mkdir"> | undefined;
    filename: string | (() => string);
    writeOptions?: {
        encoding?: BufferEncoding | undefined;
        mode?: number | undefined;
        flag?: string | undefined;
        /**
         * Write in file every `flushInterval`ms
         */
        flushInterval?: number | undefined;
    } | undefined;
    format?: Encoder | undefined;
}) => LogHandler;
export {};
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