try hv 9

.htmlvalidate.mjs

@@ -0,0 +1,15 @@
+import { defineConfig } from 'htmlvalidate';
+
+export default defineConfig({
+  "plugins": ["<rootDir>/test/plugin.html-validate.mjs"],
+  "extends": ["html-validate:prettier", "<rootDir>/test/plugin.html-validate.mjs:recommended"],
+  "rules": {
+    "mailto-awesome": "error",
+    "external-links": "error",
+    "no-jquery": "error",
+    "canonical-link": "error",
+    "latest-packages": "error",
+    "https-links": "error",
+    "internal-links": "error"
+  }
+});

test/build-html-validate.mjs

@@ -1,25 +1,13 @@
-import { HtmlValidate, formatterFactory } from "html-validate";
+import { HtmlValidate, FileSystemConfigLoader, formatterFactory, esmResolver } from "html-validate";
 import { glob } from "glob";
-import plugin from "./plugin.html-validate.mjs";
 
 // Find and sort all HTML files in the 'build' directory
 const targets = glob.sync("build/**/*.html").sort();
 
 // Initialize HtmlValidate instance
-const htmlValidate = new HtmlValidate({
-  extends: ["html-validate:prettier"],
-  plugins: [plugin],
-  rules: {
-    "mailto-awesome": "error",
-    "external-links": "error",
-    "no-jquery": "error",
-    "canonical-link": "error",
-    "latest-packages": "error",
-    "https-links": "error",
-    "internal-links": "error",
-  },
-});
-
+const resolver = esmResolver();
+const loader = new FileSystemConfigLoader([resolver]);
+const htmlValidate = new HtmlValidate(loader);
 const formatter = formatterFactory("stylish");
 let allTestsPassed = true;
 

test/plugin.html-validate.mjs

@@ -8,7 +8,7 @@ import LatestPackagesRules from "./plugin.html-validate.latest-packages.mjs";
 import EnsureHttpsRules from "./plugin.html-validate.https-links.mjs";
 import CheckInternalLinks from "./plugin.html-validate.internal-links.mjs";
 
-const plugin = definePlugin({
+export default definePlugin({
   name: "pacific-medical-training",
   rules: {
     "mailto-awesome": MailtoAwesomeRule,
@@ -32,6 +32,4 @@ const plugin = definePlugin({
       },
     },
   },
-});
-
-export default plugin;
+});

yarn.lock

@@ -640,9 +640,9 @@ __metadata:
   languageName: node
   linkType: hard
 
-"html-validate@npm:^8.27.0":
-  version: 8.27.0
-  resolution: "html-validate@npm:8.27.0"
+"html-validate@npm:^9.0.0-rc.3":
+  version: 9.0.0-rc.3
+  resolution: "html-validate@npm:9.0.0-rc.3"
   dependencies:
     "@html-validate/stylish": "npm:^4.1.0"
     "@sidvind/better-ajv-errors": "npm:3.0.1"
@@ -668,7 +668,7 @@ __metadata:
       optional: true
   bin:
     html-validate: bin/html-validate.js
-  checksum: 10c0/c1e32841a3c45f6c0336d2f4175b29bc0a54c188150bc60a3951c6c71cde724daa3b3ef6ed6f1c690f5ed89c30fb572691b8a5144c6c82b7b42545a04f7bc8cd
+  checksum: 10c0/a60c71cade632426084b2ff3bc1fbff36114ca07e5675e9a5da6f8946b52e295fb4fa3a9e3c8ac8ad00f1b99fcc2e149bdc4be98684f334c2760431b14e17bac
   languageName: node
   linkType: hard
 
@@ -1444,7 +1444,7 @@ __metadata:
     better-sqlite3: "npm:^11.6.0"
     front-matter: "npm:^4.0.2"
     glob: "npm:^11.0.0"
-    html-validate: "npm:^8.27.0"
+    html-validate: "npm:^9.0.0-rc.3"
     markdownlint-cli2: "npm:^0.15.0"
     prettier: "npm:^3.4.2"
     shell-quote: "npm:^1.8.2"