Fix a few more misc issues (TS errors, dupe files)

src/lib/utils/tree-walker.ts

@@ -1,35 +0,0 @@
-type AcceptNode = (
-  node: HTMLElement
-) =>
-  | typeof NodeFilter.FILTER_ACCEPT
-  | typeof NodeFilter.FILTER_SKIP
-  | typeof NodeFilter.FILTER_REJECT;
-
-export function treeWalker({
-  container,
-  accept,
-  walk,
-  enabled,
-}: {
-  container: HTMLElement | null;
-  accept: AcceptNode;
-  walk(node: HTMLElement): void;
-  enabled?: boolean;
-}) {
-  let root = container;
-  if (!root) return;
-  if (enabled !== undefined && !enabled) return;
-
-  let acceptNode = Object.assign((node: HTMLElement) => accept(node), {
-    acceptNode: accept,
-  });
-  // @ts-ignore-error Typescript bug thinks this can only have 3 args
-  let walker = document.createTreeWalker(
-    root,
-    NodeFilter.SHOW_ELEMENT,
-    acceptNode,
-    false
-  );
-
-  while (walker.nextNode()) walk(walker.currentNode as HTMLElement);
-}