1 files changed, 23 insertions, 1 deletions
diff --git a/packages/taler-wallet-core/src/query.ts b/packages/taler-wallet-core/src/query.ts
index 4c169946c..994a6a96d 100644
--- a/packages/taler-wallet-core/src/query.ts
+++ b/packages/taler-wallet-core/src/query.ts
@@ -742,12 +742,34 @@ function makeWriteContext(
   return ctx;
 }
 
+export interface DbAccess<StoreMap> {
+  idbHandle(): IDBDatabase;
+  runAllStoresReadWriteTx<T>(
+    txf: (
+      tx: DbReadWriteTransaction<StoreMap, Array<StoreNames<StoreMap>>>,
+    ) => Promise<T>,
+  ): Promise<T>;
+  runAllStoresReadOnlyTx<T>(
+    txf: (
+      tx: DbReadOnlyTransaction<StoreMap, Array<StoreNames<StoreMap>>>,
+    ) => Promise<T>,
+  ): Promise<T>;
+  runReadWriteTx<T, StoreNameArray extends Array<StoreNames<StoreMap>>>(
+    storeNames: StoreNameArray,
+    txf: (tx: DbReadWriteTransaction<StoreMap, StoreNameArray>) => Promise<T>,
+  ): Promise<T>;
+  runReadOnlyTx<T, StoreNameArray extends Array<StoreNames<StoreMap>>>(
+    storeNames: StoreNameArray,
+    txf: (tx: DbReadOnlyTransaction<StoreMap, StoreNameArray>) => Promise<T>,
+  ): Promise<T>;
+}
+
 /**
  * Type-safe access to a database with a particular store map.
  *
  * A store map is the metadata that describes the store.
  */
-export class DbAccess<StoreMap> {
+export class DbAccessImpl<StoreMap> implements DbAccess<StoreMap> {
   constructor(
     private db: IDBDatabase,
     private stores: StoreMap,