some progress

node_modules/mongoose/lib/options/SchemaObjectIdOptions.js

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+'use strict';
+
+const SchemaTypeOptions = require('./SchemaTypeOptions');
+
+/**
+ * The options defined on an ObjectId schematype.
+ *
+ * #### Example:
+ *
+ *     const schema = new Schema({ testId: mongoose.ObjectId });
+ *     schema.path('testId').options; // SchemaObjectIdOptions instance
+ *
+ * @api public
+ * @inherits SchemaTypeOptions
+ * @constructor SchemaObjectIdOptions
+ */
+
+class SchemaObjectIdOptions extends SchemaTypeOptions {}
+
+const opts = require('./propertyOptions');
+
+/**
+ * If truthy, uses Mongoose's default built-in ObjectId path.
+ *
+ * @api public
+ * @property auto
+ * @memberOf SchemaObjectIdOptions
+ * @type {Boolean}
+ * @instance
+ */
+
+Object.defineProperty(SchemaObjectIdOptions.prototype, 'auto', opts);
+
+/**
+ * Sets default [populate options](/docs/populate.html#query-conditions).
+ *
+ * #### Example:
+ *
+ *     const schema = new Schema({
+ *       child: {
+ *         type: 'ObjectId',
+ *         ref: 'Child',
+ *         populate: { select: 'name' }
+ *       }
+ *     });
+ *     const Parent = mongoose.model('Parent', schema);
+ *
+ *     // Automatically adds `.select('name')`
+ *     Parent.findOne().populate('child');
+ *
+ * @api public
+ * @property populate
+ * @memberOf SchemaObjectIdOptions
+ * @type {Object}
+ * @instance
+ */
+
+Object.defineProperty(SchemaObjectIdOptions.prototype, 'populate', opts);
+
+/*!
+ * ignore
+ */
+
+module.exports = SchemaObjectIdOptions;