Set type=module in package.json

eslint.config.mjs

@@ -21,10 +21,20 @@ export default [
       },
     },
   },
+  {
+    files: ['**/*.cjs'],
+    languageOptions: {
+      sourceType: 'script',
+    },
+  },
   { languageOptions: { globals: globals.node } },
   pluginJs.configs.recommended,
   eslintConfigPrettier,
   {
-    ignores: ['tests/fixture/*', 'tests/fixture-ts/*', 'files/ember-cli-build.js'],
+    ignores: [
+      'tests/fixture/*',
+      'tests/fixture-ts/*',
+      'files/ember-cli-build.cjs',
+    ],
   },
 ];

files/_js_eslint.config.mjs

@@ -72,16 +72,7 @@ export default [
    * CJS node files
    */
   {
-    files: [
-      '**/*.cjs',
-      'config/**/*.js',
-      'testem.js',
-      'testem*.js',
-      '.prettierrc.js',
-      '.stylelintrc.js',
-      '.template-lintrc.js',
-      'ember-cli-build.js',
-    ],
+    files: ['**/*.cjs'],
     plugins: {
       n,
     },

files/_ts_eslint.config.mjs

@@ -92,16 +92,7 @@ export default ts.config(
    * CJS node files
    */
   {
-    files: [
-      '**/*.cjs',
-      'config/**/*.js',
-      'testem.js',
-      'testem*.js',
-      '.prettierrc.js',
-      '.stylelintrc.js',
-      '.template-lintrc.js',
-      'ember-cli-build.js',
-    ],
+    files: ['**/*.cjs'],
     plugins: {
       n,
     },

files/package.json

@@ -4,6 +4,7 @@
   "private": true,
   "description": "Small description for <%= name %> goes here",
   "repository": "",
+  "type": "module",
   "license": "MIT",
   "author": "",
   "directories": {

tests/default.test.mjs

@@ -93,7 +93,7 @@ describe('basic functionality', function () {
           });
 
           writeFileSync(
-            join(project.dir(), 'testem-dev.js'),
+            join(project.dir(), 'testem-dev.cjs'),
             `module.exports = {
   test_page: 'tests/index.html?hidepassed',
   disable_watching: true,
@@ -115,7 +115,7 @@ describe('basic functionality', function () {
     },
   },
   middleware: [
-    require(__dirname + '/testem-proxy.js')('${appURL}')
+    require(__dirname + '/testem-proxy.cjs')('${appURL}')
   ],
 };
 `,
@@ -124,7 +124,7 @@ describe('basic functionality', function () {
           let testResult = await project.execa('pnpm', [
             'testem',
             '--file',
-            'testem-dev.js',
+            'testem-dev.cjs',
             'ci',
           ]);
           expect(testResult.exitCode).to.eq(0, testResult.output);