idb wip

1 files changed, 22 insertions, 0 deletions

diff --git a/packages/idb-bridge/src/util/openPromise.ts b/packages/idb-bridge/src/util/openPromise.ts
new file mode 100644
index 000000000..3f6da81bd
--- /dev/null
+++ b/packages/idb-bridge/src/util/openPromise.ts
@@ -0,0 +1,22 @@
+function openPromise<T>(): {
+  promise: Promise<T>;
+  resolve: (v?: T | PromiseLike<T>) => void;
+  reject: (err?: any) => void;
+} {
+  let resolve;
+  let reject;
+  const promise = new Promise<T>((resolve2, reject2) => {
+    resolve = resolve2;
+    reject = reject2;
+  });
+  if (!resolve) {
+    throw Error("broken invariant");
+  }
+  if (!reject) {
+    throw Error("broken invariant");
+  }
+
+  return { promise, resolve, reject };
+}
+
+export default openPromise;