import stream from "stream";
interface ToUtf8Options {
    encoding?: string;
    sampleSize?: number;
}
export declare function detectEncoding(buf: Buffer): string;
export default class ToUtf8 extends stream.Transform {
    private encodingHint?;
    private sampleSize;
    private sampleBuffer;
    private sampledLength;
    private decoder?;
    private detected?;
    constructor(opts?: ToUtf8Options);
    get detectedEncoding(): string | undefined;
    private useEncoding;
    private flushSample;
    _transform(chunk: Buffer, _enc: string, cb: (err?: Error | null) => void): void;
    _flush(cb: (err?: Error | null) => void): void;
}
export {};