planning

node_modules/mdast-util-to-markdown/lib/util/check-fence.js

@@ -0,0 +1,15 @@
+module.exports = checkFence
+
+function checkFence(context) {
+  var marker = context.options.fence || '`'
+
+  if (marker !== '`' && marker !== '~') {
+    throw new Error(
+      'Cannot serialize code with `' +
+        marker +
+        '` for `options.fence`, expected `` ` `` or `~`'
+    )
+  }
+
+  return marker
+}