fix(@formatjs/ecma402-abstract): make Set usage IE11-safe, fix #2529

formatjs · Jan 27, 2021 · 2ebe21c · 2ebe21c
1 parent 7d94cf7
commit 2ebe21c
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/packages/ecma402-abstract/IsValidTimeZoneName.ts b/packages/ecma402-abstract/IsValidTimeZoneName.ts
@@ -14,6 +14,9 @@ export function IsValidTimeZoneName(
   }
 ): boolean {
   const uppercasedTz = tz.toUpperCase();
-  const zoneNames = new Set(Object.keys(tzData).map(z => z.toUpperCase()));
+  const zoneNames = new Set();
+  Object.keys(tzData)
+    .map(z => z.toUpperCase())
+    .forEach(z => zoneNames.add(z));
   return zoneNames.has(uppercasedTz) || uppercasedTz in uppercaseLinks;
 }