in build/BuildSteps.cs [373:386]
public static void CreateBundleJsonFile(string path)
{
var serializer = new JsonSerializerSettings();
serializer.NullValueHandling = NullValueHandling.Ignore;
Extension bundleInfo = new Extension()
{
Id = BundleConfiguration.Instance.ExtensionBundleId,
Version = BundleConfiguration.Instance.ExtensionBundleVersion
};
var fileContents = JsonConvert.SerializeObject(bundleInfo, serializer);
string bundleJsonPath = Path.Combine(path, "bundle.json");
FileUtility.Write(bundleJsonPath, fileContents);
}