Fix potential memory leak

CHANGELOG.md

@@ -14,6 +14,12 @@ This driver uses semantic versioning:
 - A change in the major version (e.g. 1.Y.Z -> 2.0.0) indicates _breaking_
   changes that require changes in your code to upgrade.
 
+## [Unreleased]
+
+### Fixed
+
+- Fixed a potential memory leak in cursor batch handling
+
 ## [7.0.2] - 2020-09-25
 
 ### Fixed
@@ -1103,6 +1109,7 @@ For a detailed list of changes between pre-release versions of v7 see the
 
   Graph methods now only return the relevant part of the response body.
 
+[unreleased]: https://github.com/arangodb/arangojs/compare/v7.0.2...HEAD
 [7.0.2]: https://github.com/arangodb/arangojs/compare/v7.0.1...v7.0.2
 [7.0.1]: https://github.com/arangodb/arangojs/compare/v7.0.0...v7.0.1
 [7.0.0]: https://github.com/arangodb/arangojs/compare/v6.14.1...v7.0.0

src/cursor.ts

@@ -289,7 +289,10 @@ export class BatchedArrayCursor<T = any> {
       return undefined;
     }
     const batch = this._batches.shift();
-    return batch && [...batch.values()];
+    if (!batch) return undefined;
+    const values = [...batch.values()];
+    batch.clear(true);
+    return values;
   }
 
   /**