/** Exposed so the narrow cross-platform fallback policy stays regression-tested. */
export declare function isUnsupportedDirectoryFsyncError(err: unknown): boolean;
/**
 * fsync a directory entry when the host filesystem supports it.
 *
 * Linux/macOS filesystems normally support directory fsync. Some platforms
 * and virtual/network filesystems reject the operation with a documented
 * "unsupported" errno. In that narrow case atomicity remains intact but crash
 * durability is best-effort; genuine I/O and permission errors still fail the
 * publication rather than making a false durability claim.
 */
export declare function fsyncDirectorySyncPortable(directoryPath: string): void;
/** Strictly fsync one regular file. Symlinks/devices are never accepted. */
export declare function fsyncRegularFileSync(filePath: string): void;
/**
 * Make a set of already-written files and their directory entries durable.
 * Duplicate paths are intentionally collapsed to avoid redundant disk flushes.
 */
export declare function fsyncFilesAndDirectorySync(directoryPath: string, filePaths: readonly string[]): void;
//# sourceMappingURL=fs-durability.d.ts.map