From ebfc79756f14b08ac3735b2746ac48fd3483b5e4 Mon Sep 17 00:00:00 2001
From: Sebastian <sebasjm@gmail.com>
Date: Wed, 7 Jul 2021 13:28:02 -0300
Subject: add providers filter to runBackupCycle

---
 packages/taler-util/src/helpers.ts | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

(limited to 'packages/taler-util/src')

diff --git a/packages/taler-util/src/helpers.ts b/packages/taler-util/src/helpers.ts
index 53a9a43d4..089602c9d 100644
--- a/packages/taler-util/src/helpers.ts
+++ b/packages/taler-util/src/helpers.ts
@@ -110,3 +110,18 @@ export function strcmp(s1: string, s2: string): number {
 export function j2s(x: any): string {
   return JSON.stringify(x, undefined, 2);
 }
+
+/**
+ * Use this to filter null or undefined from an array in a type-safe fashion
+ * 
+ * example:
+ * const array: Array<T | undefined> = [undefined, null]
+ * const filtered: Array<T> = array.filter(notEmpty)
+ * 
+ * @param value 
+ * @returns 
+ */
+export function notEmpty<T>(value: T | null | undefined): value is T {
+  return value !== null && value !== undefined;
+}
+
-- 
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