2 files changed, 36 insertions, 0 deletions
diff --git a/FrontEnd/src/utilities/index.ts b/FrontEnd/src/utilities/index.ts
index 7659a8aa..e280274e 100644
--- a/FrontEnd/src/utilities/index.ts
+++ b/FrontEnd/src/utilities/index.ts
@@ -1,5 +1,6 @@
 export { default as base64 } from "./base64";
 export { withQuery } from "./url";
+export { subscribePromise } from "./promise";
 
 export function delay(milliseconds: number): Promise<void> {
   return new Promise<void>((resolve) => {
diff --git a/FrontEnd/src/utilities/promise.ts b/FrontEnd/src/utilities/promise.ts
new file mode 100644
index 00000000..96bcceac
--- /dev/null
+++ b/FrontEnd/src/utilities/promise.ts
@@ -0,0 +1,35 @@
+export function subscribePromise<T>(
+  promise: Promise<T>,
+  resolve: Parameters<Promise<T>["then"]>[0],
+  reject?: Parameters<Promise<T>["then"]>[1],
+): {
+  promise: ReturnType<Promise<T>["then"]>;
+  (): void;
+} {
+  let subscribe = true;
+
+  const p = promise.then(
+    resolve != null
+      ? (value) => {
+          if (subscribe) {
+            resolve(value);
+          }
+        }
+      : undefined,
+    reject != null
+      ? (error) => {
+          if (subscribe) {
+            reject(error);
+          }
+        }
+      : undefined,
+  );
+
+  const result = function () {
+    subscribe = false;
+  };
+  result.promise = p;
+
+  return result;
+}
+