/**
 * Executes the given command synchronously.
 * @async
 * @param command The command to execute.
 * @param path If given, defines the working directory of the created child process.
 * Resolves the promise with the console buffer parsed as string.
 */
export declare function execSync(command: string, path?: string): Promise<string>;
/**
 * Utility method to update a JSON file.
 * @async
 * @param filePath The relative path to the file to update, from the target project path.
 * @param modifier The method to call that will modify the file content when opened.
 */
export declare function updateJsonFile(filePath: string, modifier: (content: any) => Promise<void> | void): Promise<void>;
/**
 * Utility method to update a text file.
 * @async
 * @param filePath The relative path to the file to update, from the target project path.
 * @param modifier The method to call that will modify the file content when opened.
 */
export declare function updateFile(filePath: string, modifier: (content: string) => Promise<string> | string): Promise<void>;
/**
 * Checks if the string is null, not a string, or an empty one.
 * @param str The string you want to validate.
 */
export declare function isNullOrEmpty(str: unknown): boolean;