Add ID to headings

package.json

@@ -23,13 +23,13 @@
   },
   "devDependencies": {
     "@types/lodash.capitalize": "^4.2.9",
-    "@types/unist": "^2.0.6",
-    "mdast-util-to-string": "^3.1.1",
+    "@types/unist": "^2.0.10",
+    "mdast-util-to-string": "^4.0.0",
     "rehype-raw": "^6.1.1",
-    "rehype-stringify": "^9.0.3",
-    "remark-parse": "^10.0.1",
+    "rehype-stringify": "^9.0.4",
+    "remark-parse": "^10.0.2",
     "remark-rehype": "^10.1.0",
-    "typescript": "^5.0.2",
+    "typescript": "^5.5.4",
     "unified": "^10.1.2"
   }
 }

src/index.ts

@@ -2,6 +2,7 @@ import capitalize from "lodash.capitalize"
 import { visit } from "unist-util-visit"
 import { toHast } from "mdast-util-to-hast"
 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"
 
 // !?               -> optional embedding
@@ -320,5 +321,13 @@ export default function ofm() {
                 }
             }
         })
+
+        visit(tree, "heading", (node) => {
+            node.data = {
+                hProperties: {
+                    id: toString(node)
+                }
+            };
+        });
     }
 }