Add "Tag" as a new mdast type.

src/index.ts

@@ -5,6 +5,23 @@ import { toHtml } from "hast-util-to-html"
 import { toString } from 'mdast-util-to-string';
 import { FindAndReplaceList, findAndReplace as mdastFindReplace } from "mdast-util-find-and-replace"
 
+declare module 'mdast'
+{
+    interface Tag  extends Literal {
+        type: "tag";
+        data?: TagData | undefined;
+    }
+    interface TagData extends Data {}
+    interface PhrasingContentMap
+    {
+        tag: Tag;
+    }
+    interface RootContentMap
+    {
+        tag: Tag;
+    }
+}
+
 // !?               -> optional embedding
 // \[\[             -> open brace
 // ([^\[\]\|\#]+)   -> one or more non-special characters ([,],|, or #) (name)
@@ -179,35 +196,14 @@ export default function ofm() {
                     return false
                 }
 
-                tag = slugTag(tag)
+                tag = slugTag(tag);
-
-                if (!file.data)
-                    file.data = {};
-
-                if (!file.data.frontmatter)
-                    file.data.frontmatter = {};
-
-                if (!file.data.frontmatter.tags)
-                    file.data.frontmatter.tags = [];
-
-                if (file.data.frontmatter && !file.data.frontmatter.tags.includes(tag)) {
-                    file.data.frontmatter.tags.push(tag)
-                }
 
                 return {
-                    type: "link",
+                    type: "tag",
-                    url: `/tags#${tag}`,
+                    value: tag,
                     data: {
-                        hProperties: {
+                        hName: 'tag',
-                            className: ["tag"],
+                    }
-                        },
-                    },
-                    children: [
-                        {
-                            type: "text",
-                            value: `#${tag}`,
-                        },
-                    ],
                 }
             },
         ])