Add linter workflow

The callback is only optional, if you don't use the options.
https://docs.magicmirror.builders/development/core-module-file.html#this-hide-speed-callback-options

Without this change you can see an error message in the browser console: "callback is not an optional parameter!"

.github/workflows/automated-tests.yaml

@@ -0,0 +1,26 @@
+name: Automated Tests
+on:
+  push:
+    branches: [master, develop]
+  pull_request:
+    branches: [master, develop]
+
+permissions:
+  contents: read
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@v4
+      - name: Use Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: npm
+      - name: Install dependencies
+        run: npm ci
+      - name: Check linting
+        run: npm run lint

MMM-pages.js

@@ -212,13 +212,13 @@ Module.register('MMM-pages', {
 
     MM.getModules()
       .exceptWithClass(modulesToShow)
-      .enumerate(module => module.hide(animationTime, lockStringObj));
+      .enumerate(module => module.hide(animationTime, () => {}, lockStringObj));
 
     // Shows all modules meant to be on the current page, after a small delay.
     setTimeout(() => {
       MM.getModules()
         .withClass(modulesToShow)
-        .enumerate(module => module.show(animationTime, lockStringObj));
+        .enumerate(module => module.show(animationTime, () => {}, lockStringObj));
     }, animationTime);
   },