/**
 * Merge source JSON file (with comments) into target JSON file (with comments) at node level.
 * Rules:
 *  - If a top-level or nested property in source does not exist in target, add it (preserving source value).
 *  - If property exists and both values are arrays, append source array elements to target array (with de-duplication).
 *  - If property exists and both values are plain objects, recurse.
 *  - Otherwise (primitive / mismatched types), keep the existing target value (no overwrite).
 *  - Comments present in the existing target file are preserved. New properties won't have comments unless provided in target.
 */
export declare function mergeJsonFile(sourcePath: string, targetPath: string): Promise<void>;
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