/**
 * Atomic File Write
 *
 * Write files atomically using write-to-temp-then-rename pattern.
 * Prevents corrupted config/cache files from crash-mid-write scenarios.
 *
 * @since v2.5.19
 */
/**
 * Write a file atomically by writing to a temp file first, then renaming.
 * Rename is atomic on the same filesystem, so either the old or new content
 * is fully present — never a partial write.
 */
export declare function writeFileAtomic(filePath: string, content: string, options?: {
    mode?: number;
}): Promise<void>;
/**
 * Synchronous version of writeFileAtomic for code that uses sync I/O.
 */
export declare function writeFileAtomicSync(filePath: string, content: string | Buffer, options?: {
    mode?: number;
}): void;
/**
 * Copy a file atomically: copy to temp, then rename.
 * Prevents partial JARs if the process crashes mid-copy.
 */
export declare function copyFileAtomic(src: string, dest: string): Promise<void>;
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