/** Injected filesystem primitives — narrow and synchronous, so ordering and
 *  failure paths are testable without a real disk race. */
export interface AtomicFsDeps {
    /** Current bytes at `path`, or `undefined` when it does not exist. */
    readConfig(path: string): Buffer | undefined;
    createTemp(path: string): string;
    write(path: string, bytes: Buffer): void;
    fsync(path: string): void;
    /** Flush the directory ENTRY created by a rename, not the file's contents.
     *  Syncing the file only guarantees its bytes survive; on several filesystems
     *  the rename that gives those bytes their name is a separate metadata update
     *  that a power loss can still lose. */
    fsyncDir(path: string): void;
    rename(from: string, to: string): void;
    remove(path: string): void;
}
export declare function realFsDeps(): AtomicFsDeps;
/** Replace `path`'s contents with `bytes`, atomically. Any failure leaves the
 *  original bytes untouched and removes the temp file. */
export declare function atomicWriteBytes(fs: AtomicFsDeps, path: string, bytes: Buffer): void;
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