Commit With Frontend and Backend in MERN

backend/node_modules/mongoose/lib/helpers/indexes/isTimeseriesIndex.js

@@ -0,0 +1,16 @@
+'use strict';
+
+/**
+ * Returns `true` if the given index matches the schema's `timestamps` options
+ */
+
+module.exports = function isTimeseriesIndex(dbIndex, schemaOptions) {
+  if (schemaOptions.timeseries == null) {
+    return false;
+  }
+  const { timeField, metaField } = schemaOptions.timeseries;
+  if (typeof timeField !== 'string' || typeof metaField !== 'string') {
+    return false;
+  }
+  return Object.keys(dbIndex.key).length === 2 && dbIndex.key[timeField] === 1 && dbIndex.key[metaField] === 1;
+};