/**
 * Recursive search upwards for a config file with the given name, starting from the specified directory.
 * fx: dotenv-diff.config.json or dotenv-diff.baseline.json
 * @param dir - Directory to start searching from
 * @param file - The name of the config file to search for
 * @returns The path to the config file if found, otherwise null
 */
export declare function findConfigFile(dir: string, file: string): string | null;
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