ESLint 9 + flat configs

files/__addonLocation__/_js_eslint.config.mjs

@@ -0,0 +1,109 @@
+/**
+ * Debugging:
+ *   https://eslint.org/docs/latest/use/configure/debug
+ *  ----------------------------------------------------
+ *
+ *   Print a file's calculated configuration
+ *
+ *     npx eslint --print-config path/to/file.js
+ *
+ *   Inspecting the config
+ *
+ *     npx eslint --inspect-config
+ *
+ */
+import globals from 'globals';
+import js from '@eslint/js';
+
+import ember from 'eslint-plugin-ember/recommended';
+import imports from 'eslint-plugin-import';
+import prettier from 'eslint-plugin-prettier/recommended';
+import n from 'eslint-plugin-n';
+
+import babelParser from '@babel/eslint-parser';
+
+const esmParserOptions = {
+  ecmaFeatures: { modules: true },
+  ecmaVersion: 'latest',
+};
+
+export default [
+  js.configs.recommended,
+  prettier,
+  ember.configs.base,
+  ember.configs.gjs,
+  /**
+   * Ignores must be in their own object
+   * https://eslint.org/docs/latest/use/configure/ignore
+   */
+  {
+    ignores: ['dist/', 'node_modules/', 'coverage/', '!**/.*'],
+  },
+  /**
+   * https://eslint.org/docs/latest/use/configure/configuration-files#configuring-linter-options
+   */
+  {
+    linterOptions: {
+      reportUnusedDisableDirectives: 'error',
+    },
+  },
+  {
+    files: ['**/*.js'],
+    languageOptions: {
+      parser: babelParser,
+    },
+  },
+  {
+    files: ['**/*.{js,gjs}'],
+    languageOptions: {
+      parserOptions: esmParserOptions,
+      globals: {
+        ...globals.browser,
+      },
+    },
+  },
+  {
+    files: ['**/*.{js,gjs,ts,gts}'],
+    plugins: {
+      import: imports,
+    },
+    rules: {
+      'import/extensions': ['error', 'always', { ignorePackages: true }],
+    },
+  },
+  /**
+   * CJS node files
+   */
+  {
+    files: ['**/*.cjs'],
+    plugins: {
+      n,
+    },
+
+    languageOptions: {
+      sourceType: 'script',
+      ecmaVersion: 'latest',
+      globals: {
+        ...globals.node,
+      },
+    },
+  },
+  /**
+   * ESM node files
+   */
+  {
+    files: ['**/*.mjs'],
+    plugins: {
+      n,
+    },
+
+    languageOptions: {
+      sourceType: 'module',
+      ecmaVersion: 'latest',
+      parserOptions: esmParserOptions,
+      globals: {
+        ...globals.node,
+      },
+    },
+  },
+];

files/__addonLocation__/_ts_eslint.config.mjs

@@ -0,0 +1,136 @@
+/**
+ * Debugging:
+ *   https://eslint.org/docs/latest/use/configure/debug
+ *  ----------------------------------------------------
+ *
+ *   Print a file's calculated configuration
+ *
+ *     npx eslint --print-config path/to/file.js
+ *
+ *   Inspecting the config
+ *
+ *     npx eslint --inspect-config
+ *
+ */
+import globals from 'globals';
+import js from '@eslint/js';
+
+import ts from 'typescript-eslint';
+
+import ember from 'eslint-plugin-ember/recommended';
+import imports from 'eslint-plugin-import';
+
+import prettier from 'eslint-plugin-prettier/recommended';
+import n from 'eslint-plugin-n';
+
+import babelParser from '@babel/eslint-parser';
+
+const parserOptions = {
+  esm: {
+    js: {
+      ecmaFeatures: { modules: true },
+      ecmaVersion: 'latest',
+    },
+    ts: {
+      projectService: true,
+      tsconfigRootDir: import.meta.dirname,
+    },
+  },
+};
+
+export default ts.config(
+  js.configs.recommended,
+  ember.configs.base,
+  ember.configs.gjs,
+  ember.configs.gts,
+  prettier,
+  /**
+   * Ignores must be in their own object
+   * https://eslint.org/docs/latest/use/configure/ignore
+   */
+  {
+    ignores: ['dist/', 'declarations/', 'node_modules/', 'coverage/', '!**/.*'],
+  },
+  /**
+   * https://eslint.org/docs/latest/use/configure/configuration-files#configuring-linter-options
+   */
+  {
+    linterOptions: {
+      reportUnusedDisableDirectives: 'error',
+    },
+  },
+  {
+    files: ['**/*.js'],
+    languageOptions: {
+      parser: babelParser,
+    },
+  },
+  {
+    files: ['**/*.{js,gjs}'],
+    languageOptions: {
+      parserOptions: parserOptions.esm.js,
+      globals: {
+        ...globals.browser,
+      },
+    },
+  },
+  {
+    files: ['**/*.ts'],
+    languageOptions: {
+      parserOptions: parserOptions.esm.ts,
+    },
+    extends: [ember.configs.base, ...ts.configs.recommendedTypeChecked],
+  },
+  {
+    files: ['**/*.gts'],
+    languageOptions: {
+      parser: ember.parser,
+      parserOptions: parserOptions.esm.ts,
+    },
+    extends: [...ts.configs.recommendedTypeChecked, ember.configs.gts],
+  },
+  {
+    files: ['**/*.{js,gjs,ts,gts}'],
+    plugins: {
+      import: imports,
+    },
+    rules: {
+      'import/extensions': ['error', 'always', { ignorePackages: true }],
+    },
+  },
+  /**
+   * CJS node files
+   */
+  {
+    files: ['**/*.cjs'],
+    plugins: {
+      n,
+    },
+
+    languageOptions: {
+      sourceType: 'script',
+      ecmaVersion: 'latest',
+      globals: {
+        ...globals.node,
+      },
+    },
+  },
+  /**
+   * ESM node files
+   */
+  {
+    files: ['**/*.mjs'],
+    plugins: {
+      n,
+    },
+
+    languageOptions: {
+      sourceType: 'module',
+      ecmaVersion: 'latest',
+      parserOptions: parserOptions.esm.js,
+      globals: {
+        ...globals.node,
+      },
+    },
+  },
+);

files/__addonLocation__/package.json

@@ -70,25 +70,27 @@
     "@types/ember__modifier": "^4.0.8",
     "@types/ember__helper": "^4.0.5",
     "@types/ember__routing": "^4.0.19",
-    "@typescript-eslint/eslint-plugin": "^7.7.1",
-    "@typescript-eslint/parser": "^7.7.1",<% } %>
+    "@typescript-eslint/eslint-plugin": "^8.13.0",
+    "@typescript-eslint/parser": "^8.13.0",<% } %>
     "@rollup/plugin-babel": "^6.0.4",
     "babel-plugin-ember-template-compilation": "^2.2.5",
     "concurrently": "^8.2.2",
     "ember-source": "^<%= latestEmberSource %>",
     "ember-template-lint": "^6.0.0",<% if (packageManager === 'npm') { %>
     "ember-eslint-parser": "^0.4.2",
-    <% } %>"eslint": "^8.56.0",
+    <% } %>"eslint": "^9.14.0",
     "eslint-config-prettier": "^9.1.0",
-    "eslint-plugin-ember": "^12.0.2",
-    "eslint-plugin-import": "^2.29.1",
+    "eslint-plugin-ember": "^12.3.1",
+    "eslint-plugin-import": "^2.31.0",
     "eslint-plugin-n": "^17.3.1",
-    "eslint-plugin-prettier": "^5.1.3",
-    "prettier": "^3.2.5",
+    "eslint-plugin-prettier": "^5.2.1",
+    "globals": "15.12.0",
+    "prettier": "^3.3.3",
     "prettier-plugin-ember-template-tag": "^2.0.2",
     "rollup": "^4.16.4"<% if (!isExistingMonorepo) { %>,
     "rollup-plugin-copy": "^3.5.0"<% } %><% if (typescript) { %>,
-    "typescript": "^5.4.5"<% } %>
+    "typescript": "^5.4.5",
+    "typescript-eslint": "8.13.0"<% } %>
   },
   "ember": {
     "edition": "octane"