buid: set up eslint config

Author: pozil

eslint.config.js

@@ -0,0 +1,36 @@
+'use strict';
+
+import { defineConfig } from 'eslint/config';
+import eslintJs from '@eslint/js';
+import globals from 'globals';
+import react from 'eslint-plugin-react';
+
+export default defineConfig([
+  // React configuration for client
+  {
+    files: ['client/**/*.{js,jsx,mjs,cjs,ts,tsx}'],
+    plugins: {
+      react
+    },
+    languageOptions: {
+      parserOptions: {
+        ecmaFeatures: {
+          jsx: true
+        }
+      },
+      globals: {
+        ...globals.browser
+      }
+    }
+  },
+  // Node.js configuration for server
+  {
+    files: ['server/**/*.js'],
+    extends: [eslintJs.configs.recommended],
+    languageOptions: {
+      globals: {
+        ...globals.node
+      }
+    }
+  }
+]);