validate method
Implementation
Future<void> validate() async {
List<bool> files = await Future.wait([
checkFileExist(Constants.pubspecFilePath),
checkFileExist(Constants.mainFilePath),
]);
if (!files[0]) {
throw CliException(
message: "${Constants.pubspecFilePath.path} file is not exist",
);
}
if (!files[1]) {
throw CliException(
message: "${Constants.mainFilePath.path} file is not exist",
);
}
}