some progress

node_modules/mongoose/lib/helpers/query/completeMany.js

@@ -0,0 +1,36 @@
+'use strict';
+
+const helpers = require('../../queryhelpers');
+
+module.exports = completeMany;
+
+/**
+ * Given a model and an array of docs, hydrates all the docs to be instances
+ * of the model. Used to initialize docs returned from the db from `find()`
+ *
+ * @param {Model} model
+ * @param {Array} docs
+ * @param {Object} fields the projection used, including `select` from schemas
+ * @param {Object} userProvidedFields the user-specified projection
+ * @param {Object} [opts]
+ * @param {Array} [opts.populated]
+ * @param {ClientSession} [opts.session]
+ * @param {Function} callback
+ * @api private
+ */
+
+async function completeMany(model, docs, fields, userProvidedFields, opts) {
+  return Promise.all(docs.map(doc => new Promise((resolve, reject) => {
+    const rawDoc = doc;
+    doc = helpers.createModel(model, doc, fields, userProvidedFields);
+    if (opts.session != null) {
+      doc.$session(opts.session);
+    }
+    doc.$init(rawDoc, opts, (err) => {
+      if (err != null) {
+        return reject(err);
+      }
+      resolve(doc);
+    });
+  })));
+}