fix: fix shadowRoot typing in TS

Author: 3cp

app-min/test/my-app.spec.ext

@@ -37,7 +37,13 @@ test('my-app: should render message', async t => {
   // In Shadow DOM open mode, shadowRoot is also accessible through DOM API
   //   node.shadowRoot
   // But only Aurelia API can access shadowRoot in both open and closed mode.
-  const text = CustomElement.for(node).projector.shadowRoot.textContent;
+  const shadowRoot = CustomElement.for(node).projector.provideEncapsulationSource();
+  // @if babel
+  const text = shadowRoot.textContent;
+  // @endif
+  // @if typescript
+  const text = (shadowRoot as Node).textContent;
+  // @endif
   // @endif
   // @if !shadow-dom
   const text =  node.textContent;
@@ -69,7 +75,13 @@ describe('my-app', () => {
     // In Shadow DOM open mode, shadowRoot is also accessible through DOM API
     //   node.shadowRoot
     // But only Aurelia API can access shadowRoot in both open and closed mode.
-    const text = CustomElement.for(node).projector.shadowRoot.textContent;
+    const shadowRoot = CustomElement.for(node).projector.provideEncapsulationSource();
+    // @if babel
+    const text = shadowRoot.textContent;
+    // @endif
+    // @if typescript
+    const text = (shadowRoot as Node).textContent;
+    // @endif
     // @endif
     // @if !shadow-dom
     const text =  node.textContent;