/**
 * @copyright Sister Software
 * @license AGPL-3.0
 * @author Teffen Ellis, et al.
 *
 *   The incremental digest the runner records in `manifest.json`.
 */
/**
 * A digest built from chunks rather than from one value.
 *
 * `@mailwoman/core/hash` covers one-shot digests with `sha256Hex` and whole-file digests with `sha256File`.
 * The runner needs neither, because it hashes each jsonl line as it streams past
 * and would otherwise read the file a second time for the manifest checksum.
 */
export interface StreamingHasher {
    update(chunk: string | Uint8Array): void;
    digest(): string;
}
/**
 * A SHA-256 {@linkcode StreamingHasher} returning a hex digest.
 *
 * `digest()` is idempotent and `update()` after it throws, so a caller cannot
 * extend a digest it has already recorded.
 */
export declare function streamingSha256(): StreamingHasher;
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