Show active speaker in group calling PiP

ts/util/ringrtc/normalizeGroupCallTimestamp.ts

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+// Copyright 2020 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+/**
+ * Normalizes group call timestamps (`addedTime` and `speakerTime`) into numbers. We
+ * expect RingRTC to send a string, but it sends a malformed number as of this writing,
+ * RingRTC 2.8.3.
+ *
+ * We could probably safely do `Number(fromRingRtc)` and be done, but this is extra-
+ * careful.
+ */
+export function normalizeGroupCallTimestamp(
+  fromRingRtc: unknown
+): undefined | number {
+  let asNumber: number;
+
+  switch (typeof fromRingRtc) {
+    case 'number':
+      asNumber = fromRingRtc;
+      break;
+    case 'string':
+      asNumber = parseInt(fromRingRtc.slice(0, 15), 10);
+      break;
+    case 'bigint':
+      asNumber = Number(fromRingRtc);
+      break;
+    default:
+      return undefined;
+  }
+
+  if (Number.isNaN(asNumber) || asNumber <= 0) {
+    return undefined;
+  }
+
+  return asNumber;
+}