/** Test-only: force splitting at a small size so a fixture exercises it. Returns the previous. */
export declare function _setSplitMinArrayItemsForTesting(n: number): number;
/**
 * Produce the same string `JSON.stringify(value, null, 2)` would.
 *
 * Only for tests and small values — it defeats the entire purpose on a large one. The streaming
 * writer is {@link writeJsonAtomicStreaming}.
 */
export declare function stringifyStreamingForTesting(value: unknown): string;
/**
 * Write `value` as pretty-printed JSON to `path`, atomically, without ever materializing the whole
 * string; return the SHA-256 hex digest of the bytes written.
 *
 * Atomicity matches `atomicWriteFile`: a sibling temp file, fsync'd, then renamed into place, so a
 * crash leaves the previously committed artifact untouched rather than a truncated one. The digest
 * is computed over the same bytes as they stream past, so a caller that must stamp another artifact
 * with it (the traversal index) never needs the string either.
 */
export declare function writeJsonAtomicStreaming(path: string, value: unknown): Promise<string>;
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