implement macros

test/hopdown.test.ts

@@ -1,10 +1,10 @@
 import { expect, test, suite, describe } from 'vitest'
 
-import { HopDown } from '../dist';
+import { HopDown, defaultTags } from '../dist';
+import { TagCollection } from "../dist/tags";
 
 const hopdown = new HopDown();
 
-
 suite('Markdown to HTML Round-Trips', () => {
 
     function assert(name: string, input: string, output: string, expected: string | undefined = undefined) {