Migrates deferred-composition-child to HydroActive.

Now that HydroActive supports exposing public properties on the custom element, there is no need for a native custom element.

src/demo/hydration/deferred-composition-child.ts

@@ -1,42 +1,25 @@
-/**
- * An implementation of the `defer-hydration` community protocol which provides
- * the name of the speaker in the underlying hydrated DOM.
- */
-export class DeferredCompositionChild extends HTMLElement {
-  // Implement `defer-hydration` community protocol.
-  #hydrated = false;
-  public static observedAttributes = ['defer-hydration'];
-  public connectedCallback(): void {
-    if (!this.hasAttribute('defer-hydration')) this.#hydrate();
-  }
-  public attributeChangedCallback(
-      name: string, _oldValue: string | null, newValue: string | null): void {
-    if (name === 'defer-hydration' && newValue === null) {
-      this.#hydrate();
-    }
-  }
-
-  // Hydrate some state.
-  #speaker!: string;
-  #hydrate(): void {
-    if (this.#hydrated) return;
-    this.#hydrated = true;
+import { defineBaseComponent } from 'hydroactive';
 
-    this.#speaker = this.querySelector('span#subject')!.textContent!;
-    console.log(`Hydrating ${this.#speaker}!`);
-    this.querySelector('span#target')!.textContent = 'HydroActive';
-  }
+/** Hydrates by reading the speaker's name from the DOM and exposing it. */
+export const DeferredCompositionChild = defineBaseComponent(
+  'deferred-composition-child',
+  (host) => {
+    const speaker = host.query('span#subject').access().read(String);
+    console.log(`Hydrating ${speaker}!`);
 
-  // Return hydrated state.
-  public getSpeakerName(): string {
-    return this.#speaker;
-  }
-}
+    host.query('span#target').access().write('HydroActive', String);
 
-customElements.define('deferred-composition-child', DeferredCompositionChild);
+    return {
+      /** Provides hydrated speaker name. */
+      getSpeakerName(): string {
+        return speaker;
+      }
+    };
+  },
+);
 
 declare global {
   interface HTMLElementTagNameMap {
-    'deferred-composition-child': DeferredCompositionChild;
+    'deferred-composition-child': InstanceType<typeof DeferredCompositionChild>;
   }
 }

src/demo/hydration/deferred-composition.test.ts

@@ -37,7 +37,7 @@ describe('deferred-composition', () => {
       document.body.append(el);
 
       const firstChild = el.querySelector('#first')! as
-          DeferredCompositionChild;
+          InstanceType<typeof DeferredCompositionChild>;
       expect(isHydrated(firstChild)).toBeTrue();
 
       expect(firstChild.querySelector('#target')!.textContent!)
@@ -52,7 +52,7 @@ describe('deferred-composition', () => {
       hydrate(el, DeferredComposition);
 
       const secondChild = el.querySelector('#second')! as
-          DeferredCompositionChild;
+          InstanceType<typeof DeferredCompositionChild>;
       expect(isHydrated(secondChild)).toBeTrue();
 
       expect(secondChild.querySelector('#target')!.textContent!)