feat(react): set up hook for reacting to events

apps/client/src/widgets/react/ReactBasicWidget.tsx

@@ -0,0 +1,21 @@
+import { createContext, JSX, render } from "preact";
+import BasicWidget from "../basic_widget.js";
+import Component from "../../components/component.js";
+
+export const ParentComponent = createContext<Component | null>(null);
+
+export default abstract class ReactBasicWidget extends BasicWidget {
+
+    abstract get component(): JSX.Element;
+
+    doRender() {
+        const renderContainer = new DocumentFragment();
+        render((
+            <ParentComponent.Provider value={this}>
+                {this.component}
+            </ParentComponent.Provider>
+        ), renderContainer);
+        this.$widget = $(renderContainer.firstChild as HTMLElement);
+    }
+
+}