install gulp to process code

node_modules/gulp-cli/lib/versioned/^3.7.0/format-error.js

@@ -0,0 +1,23 @@
+'use strict';
+
+// Format orchestrator errors
+function formatError(e) {
+  if (!e.err) {
+    return e.message;
+  }
+
+  // PluginError
+  if (typeof e.err.showStack === 'boolean') {
+    return e.err.toString();
+  }
+
+  // Normal error
+  if (e.err.stack) {
+    return e.err.stack;
+  }
+
+  // Unknown (string, number, etc.)
+  return new Error(String(e.err)).stack;
+}
+
+module.exports = formatError;