BREAKING CHANGE(core): switch to class based design and support html to markdown

ts/index.ts

@@ -1,3 +1,21 @@
 import * as plugins from './smartmarkdown.plugins';
 
-export const markdownToHtml = (mdString: string): string => plugins.marked(mdString);
+export class SmartMarkdown {
+  constructor() {}
+
+  /**
+   * converts markdown to html
+   * @param mdString
+   */
+  public markdownToHtml(mdString: string): string {
+    return plugins.marked(mdString);
+  }
+
+  public htmlToMarkdown(htmlString): string {
+    const turndownInstance = new plugins.turndown({
+      headingStyle: 'atx',
+      codeBlockStyle: 'fenced'
+    });
+    return turndownInstance.turndown(htmlString);
+  }
+}

ts/smartmarkdown.plugins.ts

@@ -1,3 +1,4 @@
 import marked = require('marked');
+import turndown from 'turndown';
 
-export { marked };
+export { marked, turndown };