export interface AtomicWriteOptions {
    /** File mode. Default: the existing file's mode, or the umask default (0666 & ~umask) for a new file. */
    mode?: number;
}
/** Atomically replace `path` with `content`. */
export declare function atomicWriteFile(path: string, content: string | Uint8Array, options?: AtomicWriteOptions): Promise<void>;
/** Synchronous atomicWriteFile, for callers that are synchronous. */
export declare function atomicWriteFileSync(path: string, content: string | Uint8Array, options?: AtomicWriteOptions): void;
/**
 * Atomically replace `path`, forcing `mode` (default 0600, for `.env` secrets).
 * @deprecated Use atomicWriteFile(path, content, { mode }).
 */
export declare function writeFileAtomic(path: string, content: string | Uint8Array, mode?: number): Promise<void>;
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