Support for creating New Groups

ts/util/parseIntOrThrow.ts

@@ -0,0 +1,24 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+export function parseIntOrThrow(value: unknown, message: string): number {
+  let result: number;
+
+  switch (typeof value) {
+    case 'number':
+      result = value;
+      break;
+    case 'string':
+      result = parseInt(value, 10);
+      break;
+    default:
+      result = NaN;
+      break;
+  }
+
+  if (!Number.isInteger(result)) {
+    throw new Error(message);
+  }
+
+  return result;
+}