import { Transform } from 'node:stream';
import type { TransformCallback } from 'node:stream';
/** Passes every byte on unchanged and hashes it on the way. */
export declare class DigestStream extends Transform {
    private readonly hash;
    private seen;
    private result?;
    constructor(algorithm?: string);
    get bytes(): number;
    /** @throws InvalidOperation before the stream finished, since the digest covers the whole input */
    digest(encoding?: 'hex' | 'base64'): string;
    _transform(chunk: Buffer, _encoding: BufferEncoding, callback: TransformCallback): void;
    _flush(callback: TransformCallback): void;
}
/** Passes at most `maxBytes` bytes on; the chunk that would go over fails the stream with LimitExceeded and is dropped. */
export declare class ByteLimitStream extends Transform {
    private readonly maxBytes;
    private passed;
    constructor(maxBytes: number);
    /** Bytes passed on so far; never more than `maxBytes`. */
    get bytes(): number;
    _transform(chunk: Buffer, _encoding: BufferEncoding, callback: TransformCallback): void;
}
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