Add prettier config (with <template> support

files-override/shared/.prettierrc.cjs

@@ -0,0 +1,34 @@
+'use strict';
+
+module.exports = {
+  plugins: ['prettier-plugin-ember-template-tag'],
+  overrides: [
+    {
+      files: ['*.js', '*.ts', '*.cjs', '.mjs', '.cts', '.mts', '.cts'],
+      options: {
+        singleQuote: true,
+        trailingComma: 'es5',
+      },
+    },
+    {
+      files: ['*.json'],
+      options: {
+        singleQuote: false,
+      },
+    },
+    {
+      files: ['*.hbs'],
+      options: {
+        singleQuote: false,
+      },
+    },
+    {
+      files: ['*.gjs', '*.gts'],
+      options: {
+        singleQuote: true,
+        templateSingleQuote: false,
+        trailingComma: 'es5',
+      },
+    },
+  ],
+};

index.js

@@ -50,6 +50,7 @@ module.exports = {
         'vite',
         '@rollup/plugin-babel',
         'decorator-transforms',
+        'prettier-plugin-ember-template-tag',
       ],
       packageManager: options.packageManager,
     });
@@ -80,7 +81,11 @@ module.exports = {
   },
 
   async afterInstall(options) {
-    const filesToDelete = ['app/index.html'];
+    const filesToDelete = [
+      'app/index.html',
+      // replaced with .prettierrc.cjs
+      '.prettierrc.js',
+    ];
 
     for (let file of filesToDelete) {
       await rm(join(options.target, file));

package.json

@@ -29,6 +29,7 @@
     "execa": "^9.1.0",
     "globals": "^15.3.0",
     "prettier": "^3.2.5",
+    "prettier-plugin-ember-template-tag": "^2.0.2",
     "release-plan": "^0.9.0",
     "strip-ansi": "^7.1.0",
     "tmp-promise": "^3.0.3",