/**
 * Writes data to a JSON file atomically using a temp-file-and-rename strategy.
 * This prevents file corruption if the process crashes or is killed during writing.
 *
 * @param filePath Path to the target file.
 * @param data Data to be JSON-serialized and written.
 */
export declare function writeJsonAtomic(filePath: string, data: any): void;
/**
 * Reads data from a JSON file. Returns undefined if the file doesn't exist or is corrupt.
 */
export declare function readJsonSafe<T>(filePath: string): T | undefined;