Address new code analysis issues from previous commit.

lib/cache.mjs

@@ -36,11 +36,12 @@ export function micromarkTokens() {
  * Gets a cached object value - computes it and caches it.
  *
  * @param {string} name Cache object name.
- * @param {Function} getValue Getter for object value.
+ * @param {() => Object} getValue Getter for object value.
  * @returns {Object} Object value.
  */
 function getCached(name, getValue) {
   if (map.has(name)) {
+    // @ts-ignore
     return map.get(name);
   }
   const value = getValue();
@@ -56,6 +57,7 @@ function getCached(name, getValue) {
  * @returns {MicromarkToken[]} Filtered tokens.
  */
 export function filterByTypesCached(types, htmlFlow) {
+  // @ts-ignore
   return getCached(
     // eslint-disable-next-line prefer-rest-params
     JSON.stringify(arguments),