Convert markdownlint library to an ECMAScript module, replace markdownlint-micromark with micromark, stop publishing (large) markdownlint-browser.js, see https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c for guidance.

lib/md029.mjs

@@ -0,0 +1,73 @@
+// @ts-check
+
+import { addErrorDetailIf } from "../helpers/helpers.cjs";
+import { getDescendantsByType } from "../helpers/micromark-helpers.cjs";
+import { filterByTypesCached } from "./cache.mjs";
+
+const listStyleExamples = {
+  "one": "1/1/1",
+  "ordered": "1/2/3",
+  "zero": "0/0/0"
+};
+
+/**
+ * Gets the value of an ordered list item prefix token.
+ *
+ * @param {import("../helpers/micromark-helpers.cjs").Token} listItemPrefix List item prefix token.
+ * @returns {number} List item value.
+ */
+function getOrderedListItemValue(listItemPrefix) {
+  return Number(getDescendantsByType(listItemPrefix, [ "listItemValue" ])[0].text);
+}
+
+/** @type {import("./markdownlint.mjs").Rule} */
+export default {
+  "names": [ "MD029", "ol-prefix" ],
+  "description": "Ordered list item prefix",
+  "tags": [ "ol" ],
+  "parser": "micromark",
+  "function": function MD029(params, onError) {
+    const style = String(params.config.style || "one_or_ordered");
+    for (const listOrdered of filterByTypesCached([ "listOrdered" ])) {
+      const listItemPrefixes = getDescendantsByType(listOrdered, [ "listItemPrefix" ]);
+      let expected = 1;
+      let incrementing = false;
+      // Check for incrementing number pattern 1/2/3 or 0/1/2
+      if (listItemPrefixes.length >= 2) {
+        const firstValue = getOrderedListItemValue(listItemPrefixes[0]);
+        const secondValue = getOrderedListItemValue(listItemPrefixes[1]);
+        if ((secondValue !== 1) || (firstValue === 0)) {
+          incrementing = true;
+          if (firstValue === 0) {
+            expected = 0;
+          }
+        }
+      }
+      // Determine effective style
+      let listStyle = style;
+      if (listStyle === "one_or_ordered") {
+        listStyle = incrementing ? "ordered" : "one";
+      } else if (listStyle === "zero") {
+        expected = 0;
+      } else if (listStyle === "one") {
+        expected = 1;
+      }
+      // Validate each list item marker
+      for (const listItemPrefix of listItemPrefixes) {
+        const actual = getOrderedListItemValue(listItemPrefix);
+        addErrorDetailIf(
+          onError,
+          listItemPrefix.startLine,
+          expected,
+          actual,
+          "Style: " + listStyleExamples[listStyle],
+          undefined,
+          [ listItemPrefix.startColumn, listItemPrefix.endColumn - listItemPrefix.startColumn ]
+        );
+        if (listStyle === "ordered") {
+          expected++;
+        }
+      }
+    }
+  }
+};