feat: correctly parse malformed md syntax

__tests__/lib/mdxish/mdxish.test.ts

@@ -1,16 +1,43 @@
+import type { Root } from 'hast';
+
 import { mdxish } from '../../../lib/mdxish';
 
-describe('mdxish', () => {
+describe('mdxish should render', () => {
   describe('invalid mdx syntax', () => {
     it('should render unclosed tags', () => {
       const md = '<br>';
       expect(() => mdxish(md)).not.toThrow();
     });
+  });
 
-        it('should render content in new lines', () => {
-            const md = `<div>hello
-</div>`;
-      expect(() => mdxish(md)).not.toThrow();
+  describe('relaxed md syntax, such as', () => {
+    it('wrong bold syntax', () => {
+      const md = `**Bold**
+
+Normal
+
+Hello** Wrong Bold**`;
+      const tree = mdxish(md);
+
+      const getStrongTexts = (node: Root | Root['children'][number]): string[] => {
+        const texts: string[] = [];
+        if ('type' in node && node.type === 'element' && node.tagName === 'strong') {
+          const textNodes =
+            'children' in node && Array.isArray(node.children)
+              ? node.children.filter(c => 'type' in c && c.type === 'text')
+              : [];
+          texts.push(textNodes.map(t => ('value' in t ? t.value : '')).join(''));
+        }
+        if ('children' in node && Array.isArray(node.children)) {
+          node.children.forEach(child => {
+            texts.push(...getStrongTexts(child));
+          });
+        }
+        return texts;
+      };
+
+      const strongTexts = getStrongTexts(tree);
+      expect(strongTexts.length).toBeGreaterThanOrEqual(2);
     });
   });
-});
+});