Update config files to use plain JS instead of JSON

index.js

@@ -1,18 +1,13 @@
-import { readFile } from "fs/promises";
 import _ from "lodash-es";
 import { githubMarkdownLint } from "./src/rules/index.js";
 
-const offByDefault = ["no-empty-alt-text"];
+import accessibilityRules from "./style/accessibility.js";
+import baseRules from "./style/base.js";
 
-export async function init(consumerConfig) {
-  // left overwrites right
-  const accessibilityRules = JSON.parse(
-    await readFile(new URL("./style/accessibility.json", import.meta.url)),
-  );
+const offByDefault = ["no-empty-alt-text"];
 
-  const base = JSON.parse(
-    await readFile(new URL("./style/base.json", import.meta.url)),
-  );
+export function init(consumerConfig) {
+  const base = { ...baseRules };
 
   for (const rule of githubMarkdownLint) {
     const ruleName = rule.names[1];

style/accessibility.js

@@ -0,0 +1,14 @@
+export default {
+  "no-alt-text": true,
+  "no-default-alt-text": true,
+  "no-duplicate-heading": true,
+  "no-emphasis-as-heading": true,
+  "no-generic-link-text": true,
+  "heading-increment": true,
+  "no-space-in-links": false,
+  "ol-prefix": "ordered",
+  "single-h1": true,
+  "ul-style": {
+    style: "asterisk",
+  },
+};

style/base.js

@@ -0,0 +1,7 @@
+export default {
+  default: true,
+  "no-inline-html": false,
+  "no-bare-urls": false,
+  "no-blanks-blockquote": false,
+  "fenced-code-language": true,
+};

test/accessibility-rules.test.js

@@ -1,14 +1,11 @@
-import { readFile } from "fs/promises";
 import { lint } from "markdownlint/async";
 import githubMarkdownLint from "../index.js";
+import accessibilityRules from "../style/accessibility.js";
 
 const exampleFileName = "./test/example.md";
 
 describe("when A11y rules applied", () => {
   test("fails expected rules", async () => {
-    const accessibilityRules = JSON.parse(
-      await readFile(new URL("../style/accessibility.json", import.meta.url)),
-    );
     const options = {
       config: {
         default: false,