Fix Node 18 tests

Author: FrederikBolding

packages/wallet/src/Wallet.test.ts

@@ -24,6 +24,13 @@ describe('Wallet', () => {
     // We can remove this once we drop Node 18
     // eslint-disable-next-line n/no-unsupported-features/node-builtins
     globalThis.crypto ??= webcrypto as typeof globalThis.crypto;
+
+    // eslint-disable-next-line no-restricted-syntax
+    if (!('CryptoKey' in globalThis)) {
+      Object.defineProperty(globalThis, 'CryptoKey', {
+        value: webcrypto.CryptoKey,
+      });
+    }
   });
 
   it('exposes state', async () => {