2 files changed, 7 insertions, 2 deletions
diff --git a/packages/taler-wallet-core/src/util/invariants.ts b/packages/taler-wallet-core/src/util/invariants.ts
index b788d044e..3598d857c 100644
--- a/packages/taler-wallet-core/src/util/invariants.ts
+++ b/packages/taler-wallet-core/src/util/invariants.ts
@@ -14,6 +14,13 @@
  GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
  */
 
+export class InvariantViolatedError extends Error {
+  constructor(message?: string) {
+    super(message);
+    Object.setPrototypeOf(this, InvariantViolatedError.prototype);
+  }
+}
+
 /**
  * Helpers for invariants.
  */
diff --git a/packages/taler-wallet-core/src/util/query.ts b/packages/taler-wallet-core/src/util/query.ts
index d1aae6fd6..3d4ff79cb 100644
--- a/packages/taler-wallet-core/src/util/query.ts
+++ b/packages/taler-wallet-core/src/util/query.ts
@@ -36,8 +36,6 @@ import {
   IDBKeyRange,
 } from "@gnu-taler/idb-bridge";
 import { Logger } from "@gnu-taler/taler-util";
-import { performanceNow } from "./timer.js";
-import { access } from "fs";
 
 const logger = new Logger("query.ts");