a

backend/node_modules/mongoose/lib/helpers/query/sanitizeProjection.js

@@ -0,0 +1,14 @@
+'use strict';
+
+module.exports = function sanitizeProjection(projection) {
+  if (projection == null) {
+    return;
+  }
+
+  const keys = Object.keys(projection);
+  for (let i = 0; i < keys.length; ++i) {
+    if (typeof projection[keys[i]] === 'string') {
+      projection[keys[i]] = 1;
+    }
+  }
+};