add more info when wallet-core is not available

1 files changed, 12 insertions, 5 deletions

diff --git a/packages/taler-wallet-core/src/util/promiseUtils.ts b/packages/taler-wallet-core/src/util/promiseUtils.ts
index df4cc343b..d152a12f4 100644
--- a/packages/taler-wallet-core/src/util/promiseUtils.ts
+++ b/packages/taler-wallet-core/src/util/promiseUtils.ts
@@ -23,6 +23,7 @@ export interface OpenedPromise<T> {
   promise: Promise<T>;
   resolve: (val: T) => void;
   reject: (err: any) => void;
+  lastError?: any;
 }
 
 /**
@@ -33,16 +34,22 @@ export interface OpenedPromise<T> {
  */
 export function openPromise<T>(): OpenedPromise<T> {
   let resolve: ((x?: any) => void) | null = null;
-  let reject: ((reason?: any) => void) | null = null;
+  let promiseReject: ((reason?: any) => void) | null = null;
   const promise = new Promise<T>((res, rej) => {
     resolve = res;
-    reject = rej;
+    promiseReject = rej;
   });
-  if (!(resolve && reject)) {
+  if (!(resolve && promiseReject)) {
     // Never happens, unless JS implementation is broken
-    throw Error();
+    throw Error("JS implementation is broken");
   }
-  return { resolve, reject, promise };
+  const result: OpenedPromise<T> = { resolve, reject: promiseReject, promise };
+  function saveLastError(reason?: any) {
+    result.lastError = reason;
+    promiseReject!(reason);
+  }
+  result.reject = saveLastError;
+  return result;
 }
 
 export class AsyncCondition {