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node-course/node_modules/mdast-util-to-markdown/lib/util/check-bullet-ordered.js

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+/**
+ * @import {Options, State} from 'mdast-util-to-markdown'
+ */
+
+/**
+ * @param {State} state
+ * @returns {Exclude<Options['bulletOrdered'], null | undefined>}
+ */
+export function checkBulletOrdered(state) {
+  const marker = state.options.bulletOrdered || '.'
+
+  if (marker !== '.' && marker !== ')') {
+    throw new Error(
+      'Cannot serialize items with `' +
+        marker +
+        '` for `options.bulletOrdered`, expected `.` or `)`'
+    )
+  }
+
+  return marker
+}