export interface AtomicWriteOptions {
    /**
     * File permission mode for the written file. Defaults to 0o600 (owner read/write only).
     */
    readonly mode?: number;
    /**
     * When true, creates parent directories if they do not exist. Defaults to false.
     */
    readonly mkdirp?: boolean;
}
/**
 * Writes `data` to `path` atomically: writes to a sibling temp file, fsyncs
 * it, then renames it into place. On POSIX, rename(2) is atomic so readers
 * always see either the old file or the new file, never a partial write.
 *
 * If the write or fsync fails, the temp file is cleaned up before rethrowing.
 *
 * @param path   Destination file path.
 * @param data   UTF-8 string content, or raw bytes, to write. A `Uint8Array`
 *               is written as-is; a string is written with `writeFileSync`'s
 *               default UTF-8 encoding, exactly as before this accepted bytes.
 * @param opts   Optional mode and mkdirp flags.
 */
export declare function atomicWriteFileSync(path: string, data: string | Uint8Array, opts?: AtomicWriteOptions): void;
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