export declare function fsyncDir(dir: string): void;
/** mkdir -p, then fsync every directory the call created and the parent that now lists them. */
export declare function mkdirDurable(dir: string): void;
/** Write `text` so that readers see all of it or none of it, and a crash after return keeps it. */
export declare function writeFileDurable(path: string, text: string): void;
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