Make j$.isError_ compatible with Trusted Types

The isError_ check uses a heuristic that calls the Function constructor
to determine if the given value is an Error object. This results in a
runtime violation in test suites that enforce Trusted Types.

Since Trusted Types are only supported in modern browsers (currently,
Chromium-based browsers), we can use a more straightforward heuristic in
environments where Trusted Types are supported.

Fixes #1910. See that thread for more details.

lib/jasmine-core/jasmine.js

@@ -270,6 +270,16 @@ getJasmineRequireObj().base = function(j$, jasmineGlobal) {
     if (value instanceof Error) {
       return true;
     }
+    if (
+      typeof window !== 'undefined' &&
+      typeof window.trustedTypes !== 'undefined'
+    ) {
+      return (
+        value &&
+        typeof value.stack === 'string' &&
+        typeof value.message === 'string'
+      );
+    }
     if (value && value.constructor && value.constructor.constructor) {
       var valueGlobal = value.constructor.constructor('return this');
       if (j$.isFunction_(valueGlobal)) {

src/core/base.js

@@ -102,6 +102,16 @@ getJasmineRequireObj().base = function(j$, jasmineGlobal) {
     if (value instanceof Error) {
       return true;
     }
+    if (
+      typeof window !== 'undefined' &&
+      typeof window.trustedTypes !== 'undefined'
+    ) {
+      return (
+        value &&
+        typeof value.stack === 'string' &&
+        typeof value.message === 'string'
+      );
+    }
     if (value && value.constructor && value.constructor.constructor) {
       var valueGlobal = value.constructor.constructor('return this');
       if (j$.isFunction_(valueGlobal)) {