Fix calling tools JS

js/calling-tools/assert.js

@@ -0,0 +1,19 @@
+// Derived from Chromium WebRTC Internals Dashboard - see Acknowledgements for full license details
+export function assert(value, message) {
+    if (value) {
+      return;
+    }
+    throw new Error("Assertion failed" + (message ? `: ${message}` : ""));
+  }
+  export function assertInstanceof(value, type, message) {
+    if (value instanceof type) {
+      return;
+    }
+    throw new Error(
+      message || `Value ${value} is not of type ${type.name || typeof type}`,
+    );
+  }
+  export function assertNotReached(message = "Unreachable code hit") {
+    assert(false, message);
+  }
+