Move to module, step 1 (#129)

.github/workflows/unittests.yml

@@ -23,7 +23,5 @@ jobs:
         npm ci
     - name: Verify lint
       run: npm run lint
-    - name: Eslint-check
-      run: npm run eslint-check
     - name: Run unit tests
       run: npm run test

eslint.config.mjs

@@ -0,0 +1,44 @@
+import prettier from 'eslint-plugin-prettier';
+import globals from 'globals';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+import js from '@eslint/js';
+import { FlatCompat } from '@eslint/eslintrc';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+const compat = new FlatCompat({
+  baseDirectory: __dirname,
+  recommendedConfig: js.configs.recommended,
+  allConfig: js.configs.all,
+});
+
+export default [
+  {
+    ignores: [],
+  },
+  ...compat.extends('eslint:recommended'),
+  {
+    plugins: {
+      prettier,
+    },
+
+    languageOptions: {
+      globals: {
+        ...globals.node,
+      },
+    },
+
+    rules: {
+      'prettier/prettier': [
+        'error',
+        {
+          singleQuote: true,
+        },
+      ],
+
+      'no-extra-semi': 0,
+      'no-mixed-spaces-and-tabs': 0,
+    },
+  },
+];