Wire up garden controls

src/utils/dom.ts

@@ -0,0 +1,24 @@
+import { ErrorCode, RuntimeError } from './error-handler';
+
+type ElementConstructor<T extends Element> = abstract new () => T;
+
+export const queryRequiredElement = <T extends Element>(
+  selector: string,
+  constructor: ElementConstructor<T>
+): T => {
+  const element = document.querySelector(selector);
+  if (!(element instanceof constructor)) {
+    throw new RuntimeError(
+      ErrorCode.DOM_ELEMENT_MISSING,
+      `Missing required DOM element: ${selector}`,
+      {
+        details: {
+          expectedType: constructor.name,
+          selector,
+        },
+      }
+    );
+  }
+
+  return element;
+};