refactor: enable 'EXPERIMENTAL_useProjectService' in rule-tester

Author: Rel1cx

test/fixtures/tsconfig.json

@@ -1,16 +1,31 @@
 {
+  "extends": [
+    "@tsconfig/strictest/tsconfig.json"
+  ],
   "compilerOptions": {
-    "target": "ESNext",
-    "module": "ESNext",
-    "jsx": "preserve",
+    "target": "ES2021",
+    "useDefineForClassFields": true,
     "lib": [
-      "ES2015",
-      "ES2017",
-      "ESNext"
+      "ES2021",
+      "DOM",
+      "DOM.Iterable"
     ],
+    "module": "ESNext",
+    "skipLibCheck": true,
+    /* Bundler mode */
+    "moduleDetection": "force",
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "noEmit": true,
+    "jsx": "preserve",
+    /* Linting */
     "strict": true,
-    "esModuleInterop": true,
-    "experimentalDecorators": true
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noPropertyAccessFromIndexSignature": false,
+    "noFallthroughCasesInSwitch": true
   },
   "include": [
     "**/*.ts",

test/rule-tester.ts

@@ -25,12 +25,17 @@ export const defaultLanguageOptionsWithTypes = {
   parser: tsEsLintParser,
   parserOptions: {
     ecmaFeatures: { jsx: true },
-    project: true,
+    project: "./tsconfig.json",
+    EXPERIMENTAL_useProjectService: true,
     tsconfigRootDir: getFixturesRootDir(),
   },
   sourceType: "module",
 } as const;
 
-export const ruleTester = new RuleTester({ languageOptions: defaultLanguageOptions } as never);
+export const ruleTester = new RuleTester({
+  languageOptions: defaultLanguageOptions,
+} as never);
 
-export const ruleTesterWithTypes = new RuleTester({ languageOptions: defaultLanguageOptionsWithTypes } as never);
+export const ruleTesterWithTypes = new RuleTester({
+  languageOptions: defaultLanguageOptionsWithTypes,
+} as never);