/**
 * Write JSON to a file atomically. The file is either the prior valid
 * contents or the new valid contents — never partially written — even
 * across power loss.
 *
 * Algorithm: write to a unique tmp file in the same directory, fsync
 * the data, then rename onto the target. POSIX `rename` is atomic
 * within a filesystem.
 *
 * The unique tmp suffix (pid + time + random) lets concurrent writes
 * for different targets coexist without collision. fsync is
 * best-effort — wrap in try/catch since some sandboxes don't support
 * it; the rename atomicity is the real guarantee.
 */
export declare function atomicWriteJson(filePath: string, data: unknown): void;
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