feat: support @babel/eslint-parser v8

package.json

@@ -66,7 +66,7 @@
     "vitest": "^1.2.2"
   },
   "peerDependencies": {
-    "@babel/eslint-parser": "^7.28.6",
+    "@babel/eslint-parser": "^7.28.6 || ^8.0.0",
     "@typescript-eslint/parser": "*"
   },
   "peerDependenciesMeta": {

src/parser/gjs-gts-parser.js

@@ -12,15 +12,20 @@
 // peer (TS-only setups don't need it), so a missing dep yields null and the JS
 // path below emits a targeted error.
 //
-// The experimental-worker entry point runs babel in a worker and matches the
-// parser ember-cli wires up for plain `.js` files in JS-only apps, so config
-// discovery (decorators & friends) lines up with how the rest of the project
-// is being parsed.
+// Matches the parser ember-cli wires up for plain `.js` files in JS-only
+// apps, so config discovery (decorators & friends) lines up with how the
+// rest of the project is being parsed.
 let babelParser = null;
 try {
+  // @babel/eslint-parser < 8
   babelParser = require('@babel/eslint-parser/experimental-worker');
 } catch {
-  // optional peer; left null
+  try {
+    // @babel/eslint-parser >= 8
+    babelParser = require('@babel/eslint-parser');
+  } catch {
+    // optional peer; left null
+  }
 }
 
 /**
@@ -57,7 +62,7 @@
   }
 
   if (isTypescript && !typescriptParser) {
     throw new Error('Please install typescript to process gts');
   }
 
   const filePath = options.filePath;

test-projects/configs/flat-js/package.json

@@ -9,6 +9,7 @@
     "eslint:debug-file": "pnpm eslint:with-config --print-config"
   },
   "devDependencies": {
+    "@babel/core": "^7.26.0",
     "@babel/eslint-parser": "^7.28.6",
     "@babel/plugin-proposal-decorators": "^7.23.9",
     "ember-eslint-parser": "workspace:*",

test-projects/gjs-babel-v8/babel.config.cjs

@@ -0,0 +1,37 @@
+module.exports = {
+  plugins: [
+    [
+      'babel-plugin-ember-template-compilation',
+      {
+        compilerPath: 'ember-source/dist/ember-template-compiler.js',
+        enableLegacyModules: [
+          'ember-cli-htmlbars',
+          'ember-cli-htmlbars-inline-precompile',
+          'htmlbars-inline-precompile',
+        ],
+        transforms: [],
+      },
+    ],
+    [
+      'module:decorator-transforms',
+      {
+        runtime: {
+          import: require.resolve('decorator-transforms/runtime-esm'),
+        },
+      },
+    ],
+    [
+      '@babel/plugin-transform-runtime',
+      {
+        absoluteRuntime: __dirname,
+        useESModules: true,
+        regenerator: false,
+      },
+    ],
+  ],
+
+  generatorOpts: {
+    compact: false,
+  },
+};
+

test-projects/gjs-babel-v8/eslint.config.mjs

@@ -0,0 +1,32 @@
+import ember from 'eslint-plugin-ember/recommended';
+import babelParser from '@babel/eslint-parser';
+
+const esmParserOptions = {
+  ecmaFeatures: { modules: true },
+  ecmaVersion: 'latest',
+};
+
+export default [
+  ember.configs.base,
+  ember.configs.gjs,
+  {
+    ignores: ['dist/', 'node_modules/', 'coverage/', '!**/.*'],
+  },
+  {
+    linterOptions: {
+      reportUnusedDisableDirectives: 'error',
+    },
+  },
+  {
+    files: ['**/*.js'],
+    languageOptions: {
+      parser: babelParser,
+    },
+  },
+  {
+    files: ['**/*.{js,gjs}'],
+    languageOptions: {
+      parserOptions: esmParserOptions,
+    },
+  },
+];

test-projects/gjs-babel-v8/package.json

@@ -0,0 +1,24 @@
+{
+  "name": "@test-project/gjs-babel-v8",
+  "private": true,
+  "scripts": {
+    "test:check": "pnpm run /test:check:.*/",
+    "test:check:correct-handle-syntax-error": "eslint . | grep -q '26:15  error  Parsing error: × Unexpected eof'",
+    "test:check:only-one-error": "eslint --format compact .  | egrep '^[0-9]+ problem[s]*' | wc -l | grep -q 1",
+    "test:fix": "eslint --fix --format compact . | egrep '^[0-9]+ problem[s]*' | wc -l | grep -q 1"
+  },
+  "devDependencies": {
+    "@babel/core": "^8.0.1",
+    "@babel/eslint-parser": "^8.0.1",
+    "@babel/plugin-transform-runtime": "^8.0.1",
+    "@typescript-eslint/eslint-plugin": "^8.46.4",
+    "@typescript-eslint/parser": "^8.46.4",
+    "babel-plugin-ember-template-compilation": "^3.0.1",
+    "decorator-transforms": "^2.3.0",
+    "ember-eslint-parser": "workspace:*",
+    "eslint": "^10.0.0",
+    "eslint-formatter-compact": "^9.0.1",
+    "eslint-plugin-ember": "^13.3.0",
+    "typescript": "^5.3.3"
+  }
+}

test-projects/gjs-babel-v8/src/placeholer.gjs

@@ -0,0 +1,26 @@
+import qp from 'limber/helpers/qp';
+import highlighted from 'limber/modifiers/highlighted';
+import { service } from 'limber-ui';
+
+const orGlimdown = (format) => format || 'glimdown';
+
+export const Placeholder = <template>
+  {{#let (service "editor") as |context|}}
+    <label class="sr-only" for="initial-editor">
+      Glimmer + Markdown Code Editor
+    </label>
+
+    <pre
+      data-test-placeholder
+      id="initial-editor"
+      spellcheck="false"
+      class="w-full h-full px-6 py-2 font-sm font-mono text-white"
+      {{! @glint-ignore }}
+      {{highlighted context.text}}
+      ...attributes
+    ><code class="{{orGlimdown (qp 'format')}} hljs">{{context.text}}</code></pre>
+  {{/let}}
+</template>;
+
+
+console.log(')

test-projects/gjs-types/package.json

@@ -12,6 +12,7 @@
     "test:check:project:alternate": "PROJECT=tsconfig.nojs.json eslint . --max-warnings=0"
   },
   "devDependencies": {
+    "@babel/core": "^7.26.0",
     "@babel/eslint-parser": "^7.28.6",
     "@typescript-eslint/eslint-plugin": "^8.46.4",
     "@typescript-eslint/parser": "^8.46.4",