/**
 * Byte-level helpers behind the content-addressed attachment store: the
 * best-effort durability sync, and the streaming hash+size a staged file is
 * measured by. Their own module so the row layer above stays about rows,
 * authority, and audit.
 */
export declare function fsyncBestEffort(target: string): void;
export declare function hashAndSize(target: string): {
    sha256: string;
    bytes: number;
};
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