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/md014.mjs

@@ -0,0 +1,47 @@
+// @ts-check
+
+import { addErrorContext } from "../helpers/helpers.cjs";
+import { filterByTypesCached } from "./cache.mjs";
+
+const dollarCommandRe = /^(\s*)(\$\s+)/;
+
+/** @type {import("./markdownlint.mjs").Rule} */
+export default {
+  "names": [ "MD014", "commands-show-output" ],
+  "description": "Dollar signs used before commands without showing output",
+  "tags": [ "code" ],
+  "parser": "micromark",
+  "function": function MD014(params, onError) {
+    for (const codeBlock of filterByTypesCached([ "codeFenced", "codeIndented" ])) {
+      const codeFlowValues = codeBlock.children.filter((child) => child.type === "codeFlowValue");
+      const dollarMatches = codeFlowValues
+        .map((codeFlowValue) => ({
+          "result": codeFlowValue.text.match(dollarCommandRe),
+          "startColumn": codeFlowValue.startColumn,
+          "startLine": codeFlowValue.startLine,
+          "text": codeFlowValue.text
+        }))
+        .filter((dollarMatch) => dollarMatch.result);
+      if (dollarMatches.length === codeFlowValues.length) {
+        for (const dollarMatch of dollarMatches) {
+          // @ts-ignore
+          const column = dollarMatch.startColumn + dollarMatch.result[1].length;
+          // @ts-ignore
+          const length = dollarMatch.result[2].length;
+          addErrorContext(
+            onError,
+            dollarMatch.startLine,
+            dollarMatch.text,
+            undefined,
+            undefined,
+            [ column, length ],
+            {
+              "editColumn": column,
+              "deleteCount": length
+            }
+          );
+        }
+      }
+    }
+  }
+};