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/md046.mjs

@@ -0,0 +1,31 @@
+// @ts-check
+
+import { addErrorDetailIf } from "../helpers/helpers.cjs";
+import { filterByTypesCached } from "./cache.mjs";
+
+const tokenTypeToStyle = {
+  "codeFenced": "fenced",
+  "codeIndented": "indented"
+};
+
+/** @type {import("./markdownlint.mjs").Rule} */
+export default {
+  "names": [ "MD046", "code-block-style" ],
+  "description": "Code block style",
+  "tags": [ "code" ],
+  "parser": "micromark",
+  "function": function MD046(params, onError) {
+    let expectedStyle = String(params.config.style || "consistent");
+    for (const token of filterByTypesCached([ "codeFenced", "codeIndented" ])) {
+      const { startLine, type } = token;
+      if (expectedStyle === "consistent") {
+        expectedStyle = tokenTypeToStyle[type];
+      }
+      addErrorDetailIf(
+        onError,
+        startLine,
+        expectedStyle,
+        tokenTypeToStyle[type]);
+    }
+  }
+};