/**
 * Find root directory path based on the existence of `package.json`.
 *
 * This function uses `package.json` as a marker to determine the root directory,
 * which is particularly useful in supporting MONOREPO structures.
 * It first checks the current working directory using `process.cwd()`
 * and then falls back to the Git root directory if necessary.
 *
 * @returns {string} The root directory path where `package.json` is found.
 * @throws {Error} If `package.json` cannot be found in either the current
 * working directory or the Git root directory, or if Git is not installed or accessible.
 */
export default function findRootDir(): string;