some progress

node_modules/mongoose/lib/options/SchemaBufferOptions.js

@@ -0,0 +1,38 @@
+'use strict';
+
+const SchemaTypeOptions = require('./SchemaTypeOptions');
+
+/**
+ * The options defined on a Buffer schematype.
+ *
+ * #### Example:
+ *
+ *     const schema = new Schema({ bitmap: Buffer });
+ *     schema.path('bitmap').options; // SchemaBufferOptions instance
+ *
+ * @api public
+ * @inherits SchemaTypeOptions
+ * @constructor SchemaBufferOptions
+ */
+
+class SchemaBufferOptions extends SchemaTypeOptions {}
+
+const opts = require('./propertyOptions');
+
+/**
+ * Set the default subtype for this buffer.
+ *
+ * @api public
+ * @property subtype
+ * @memberOf SchemaBufferOptions
+ * @type {Number}
+ * @instance
+ */
+
+Object.defineProperty(SchemaBufferOptions.prototype, 'subtype', opts);
+
+/*!
+ * ignore
+ */
+
+module.exports = SchemaBufferOptions;