mostly finished rewrite

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

@@ -0,0 +1,7 @@
+/**
+ * Returns one or all computed style properties of an element.
+ *
+ * @param node the element
+ * @param psuedoElement the style property
+ */
+export default function getComputedStyle(node: HTMLElement, psuedoElement?: string): CSSStyleDeclaration;