/**
 * Demerzel zstd I/O helpers
 *
 * Wraps @mongodb-js/zstd for snapshot read/write.
 * Write path: always produces <outputPath>.zst
 * Read path: tries <path>.zst first; falls back to legacy <path> (plain text)
 */
/** The `.zst` extension suffix appended to snapshot paths on disk. */
export declare const ZST_SUFFIX = ".zst";
/**
 * Given a canonical snapshot path (e.g. `.foundation/snapshot.txt`), returns
 * the on-disk compressed path (`.foundation/snapshot.txt.zst`).
 */
export declare function compressedPath(snapshotPath: string): string;
/**
 * Write `content` to `<snapshotPath>.zst`.
 * The uncompressed `.txt` file is NOT written — only the compressed form.
 *
 * @returns The actual path written to disk (i.e. `snapshotPath + ".zst"`).
 */
export declare function writeCompressed(snapshotPath: string, content: string): Promise<string>;
/**
 * Read a snapshot, transparently handling both compressed and legacy formats.
 *
 * Resolution order:
 * 1. `<snapshotPath>.zst` — decompress and return UTF-8 string
 * 2. `<snapshotPath>` (legacy plain text) — read directly
 * 3. Throws if neither exists
 */
export declare function readSnapshotContent(snapshotPath: string): Promise<string>;
/**
 * Check whether a snapshot exists on disk (either compressed or legacy).
 */
export declare function snapshotExists(snapshotPath: string): boolean;
/**
 * Return the actual on-disk path for a snapshot (compressed if present,
 * otherwise legacy), or `null` if neither exists.
 */
export declare function resolveSnapshotPath(snapshotPath: string): string | null;
//# sourceMappingURL=zstd-io.d.ts.map