Switch to ESLint projectService

See actions/typescript-action@e4ae667#diff-9601a8f6c734c2001be34a2361f76946d19a39a709b5e8c624a2a5a0aade05f2

Author: fniephaus

eslint.config.mjs

@@ -9,13 +9,9 @@ import _import from 'eslint-plugin-import'
 import jest from 'eslint-plugin-jest'
 import prettier from 'eslint-plugin-prettier'
 import globals from 'globals'
-import path from 'node:path'
-import { fileURLToPath } from 'node:url'
 
-const __filename = fileURLToPath(import.meta.url)
-const __dirname = path.dirname(__filename)
 const compat = new FlatCompat({
-  baseDirectory: __dirname,
+  baseDirectory: import.meta.dirname,
   recommendedConfig: js.configs.recommended,
   allConfig: js.configs.all
 })
@@ -52,16 +48,25 @@ export default [
       sourceType: 'module',
 
       parserOptions: {
-        project: ['tsconfig.eslint.json'],
-        tsconfigRootDir: __dirname
+        projectService: {
+          allowDefaultProject: [
+            '__fixtures__/*.ts',
+            '__tests__/*.ts',
+            'eslint.config.mjs',
+            'jest.config.js',
+            'rollup.config.ts'
+          ],
+          maximumDefaultProjectFileMatchCount_THIS_WILL_SLOW_DOWN_LINTING: 16
+        },
+        tsconfigRootDir: import.meta.dirname
       }
     },
 
     settings: {
       'import/resolver': {
         typescript: {
           alwaysTryTypes: true,
-          project: 'tsconfig.eslint.json'
+          project: 'tsconfig.json'
         }
       }
     },

jest.config.js

@@ -20,7 +20,7 @@ export default {
     '^.+\\.ts$': [
       'ts-jest',
       {
-        tsconfig: 'tsconfig.eslint.json',
+        tsconfig: 'tsconfig.json',
         useESM: true
       }
     ]

tsconfig.base.json

@@ -1,11 +1,25 @@
 {
   "$schema": "https://json.schemastore.org/tsconfig",
-  "extends": "./tsconfig.base.json",
   "compilerOptions": {
+    "allowSyntheticDefaultImports": true,
+    "declaration": false,
+    "declarationMap": false,
+    "esModuleInterop": true,
+    "forceConsistentCasingInFileNames": true,
     "isolatedModules": true,
+    "lib": ["ES2022"],
     "module": "NodeNext",
     "moduleResolution": "NodeNext",
-    "outDir": "./dist"
+    "newLine": "lf",
+    "noImplicitAny": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": false,
+    "outDir": "./dist",
+    "pretty": true,
+    "resolveJsonModule": true,
+    "strict": true,
+    "strictNullChecks": true,
+    "target": "ES2022"
   },
   "exclude": ["__fixtures__", "__tests__", "coverage", "dist", "node_modules"],
   "include": ["src"]