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-rw-r--r--src/promiseUtils.ts39
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diff --git a/src/promiseUtils.ts b/src/promiseUtils.ts
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+/*
+ This file is part of GNU Taler
+ (C) 2019 GNUnet e.V.
+
+ TALER is free software; you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software
+ Foundation; either version 3, or (at your option) any later version.
+
+ TALER is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with
+ TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
+ */
+
+ export interface OpenedPromise<T> {
+ promise: Promise<T>;
+ resolve: (val: T) => void;
+ reject: (err: any) => void;
+ }
+
+/**
+ * Get an unresolved promise together with its extracted resolve / reject
+ * function.
+ */
+export function openPromise<T>(): OpenedPromise<T> {
+ let resolve: ((x?: any) => void) | null = null;
+ let reject: ((reason?: any) => void) | null = null;
+ const promise = new Promise<T>((res, rej) => {
+ resolve = res;
+ reject = rej;
+ });
+ if (!(resolve && reject)) {
+ // Never happens, unless JS implementation is broken
+ throw Error();
+ }
+ return { resolve, reject, promise };
+} \ No newline at end of file