mostly finished rewrite

public/node_modules/dom-helpers/esm/width.d.ts

@@ -0,0 +1,7 @@
+/**
+ * Returns the width of a given element.
+ *
+ * @param node the element
+ * @param client whether to use `clientWidth` if possible
+ */
+export default function getWidth(node: HTMLElement, client?: boolean): number;