planning

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

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