1 files changed, 29 insertions, 0 deletions
diff --git a/packages/idb-bridge/src/backend-common.ts b/packages/idb-bridge/src/backend-common.ts
new file mode 100644
index 000000000..d52071939
--- /dev/null
+++ b/packages/idb-bridge/src/backend-common.ts
@@ -0,0 +1,29 @@
+import { openPromise } from "./util/openPromise.js";
+
+export class AsyncCondition {
+  _waitPromise: Promise<void>;
+  _resolveWaitPromise: () => void;
+  constructor() {
+    const op = openPromise<void>();
+    this._waitPromise = op.promise;
+    this._resolveWaitPromise = op.resolve;
+  }
+
+  wait(): Promise<void> {
+    return this._waitPromise;
+  }
+
+  trigger(): void {
+    this._resolveWaitPromise();
+    const op = openPromise<void>();
+    this._waitPromise = op.promise;
+    this._resolveWaitPromise = op.resolve;
+  }
+}
+
+export enum TransactionLevel {
+  None = 0,
+  Read = 1,
+  Write = 2,
+  VersionChange = 3,
+}