findPackageConfig function

String? findPackageConfig([ String? startDir ])

Finds the package_config.json file by recursively searching parent directories. This supports Dart workspaces where the package_config.json may be in a parent directory.

Returns the path to the package_config.json file, or null if not found.

Implementation

String? findPackageConfig([String? startDir]) {
  var dir = Directory(startDir ?? Directory.current.path);

  // Search up to the root directory
  while (true) {
    final packageConfigPath = join(
      dir.path,
      '.dart_tool',
      'package_config.json',
    );
    final packageConfigFile = File(packageConfigPath);

    if (packageConfigFile.existsSync()) {
      return packageConfigPath;
    }

    // Check if we've reached the root directory
    final parent = dir.parent;
    if (parent.path == dir.path) {
      // We've reached the root
      return null;
    }

    dir = parent;
  }
}