Address new TypeScript warnings in core files, improve type definitions.

lib/md034.mjs

@@ -3,6 +3,7 @@
 import { addErrorContext } from "../helpers/helpers.cjs";
 import { filterByPredicate, getHtmlTagInfo, inHtmlFlow } from "../helpers/micromark-helpers.cjs";
 
+/** @typedef {import("markdownlint").MicromarkToken} MicromarkToken */
 /** @typedef {import("micromark-extension-gfm-autolink-literal")} */
 
 /** @type {import("markdownlint").Rule} */
@@ -12,7 +13,7 @@ export default {
   "tags": [ "links", "url" ],
   "parser": "micromark",
   "function": function MD034(params, onError) {
-    const literalAutolinks = (tokens) => (
+    const literalAutolinks = (/** @type {MicromarkToken[]} */ tokens) => (
       filterByPredicate(
         tokens,
         (token) => {