import * as stream from 'node:stream';
type CallbackType = (error?: Error | null) => void;
export type ChunkSizeChoice = {
    kind: 'everyN';
    n: number;
} | {
    kind: 'chunksOf';
    dataSize: number;
};
export declare function everyNthByte(n: number): ChunkSizeChoice;
export declare function inferChunkSize(dataSize: number): ChunkSizeChoice;
export declare class DigestingPassThrough extends stream.Transform {
    private digester;
    constructor(key: Uint8Array<ArrayBuffer>, sizeChoice: ChunkSizeChoice);
    getFinalDigest(): Uint8Array<ArrayBuffer>;
    _transform(data: Uint8Array<ArrayBuffer>, enc: BufferEncoding, callback: CallbackType): void;
    _final(callback: CallbackType): void;
}
export declare class ValidatingPassThrough extends stream.Transform {
    private validator;
    private buffer;
    constructor(key: Uint8Array<ArrayBuffer>, sizeChoice: ChunkSizeChoice, digest: Uint8Array<ArrayBuffer>);
    _transform(data: Uint8Array<ArrayBuffer>, enc: BufferEncoding, callback: CallbackType): void;
    _final(callback: CallbackType): void;
}
export declare function chunkSizeInBytes(sizeChoice: ChunkSizeChoice): number;
export {};