refactor: Tag class support in registerTag()

src/cache/index.ts

@@ -0,0 +1,2 @@
+export * from './cache'
+export * from './lru'

src/cache/lru.ts

@@ -10,7 +10,7 @@ class Node<T> {
 }
 
 export class LRU<T> implements Cache<T> {
-  private cache: { [key: string]: Node<T> } = {}
+  private cache: Record<string, Node<T>> = {}
   private head: Node<T>
   private tail: Node<T>