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

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