From 2ee9431f1ba5bf67546bbf85758a01991c40673f Mon Sep 17 00:00:00 2001
From: Florian Dold <florian.dold@gmail.com>
Date: Sat, 15 Jun 2019 22:44:54 +0200
Subject: idb wip

---
 packages/idb-bridge/src/util/openPromise.ts | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 packages/idb-bridge/src/util/openPromise.ts

(limited to 'packages/idb-bridge/src/util/openPromise.ts')

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;
-- 
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