implement macros

dist/hopdown.d.ts

@@ -1,4 +1,4 @@
-import type { Token, TagCollectionType } from './types';
+import type { Token, TagType, TagCollectionType } from './types';
 export declare function escapeHtml(source: string): string;
 /**
  * A configurable markdown <=> HTML converter.
@@ -24,6 +24,7 @@ export declare function escapeHtml(source: string): string;
  */
 export declare class HopDown {
     tags: TagCollectionType;
+    macros: TagType | null;
     private tokenizer;
     constructor(tags?: TagCollectionType | null);
     /**