fix: update ESLint to v9 (#819)

* chore: update ESLint to v9

* chore: use node 20 for build workflow

* fix: remove unneeded packages

.github/workflows/build.yml

@@ -9,6 +9,8 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
+        with:
+          node-version: 20
       - name: install dependencies
         run: npm ci
       - name: lint check
@@ -22,6 +24,8 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
+        with:
+          node-version: 20
       - name: install dependencies
         run: npm ci
       - name: build app

eslint.config.mjs

@@ -0,0 +1,23 @@
+// @ts-check
+
+import globals from 'globals';
+import eslint from '@eslint/js';
+import tseslint from 'typescript-eslint';
+import eslintPluginPrettierRecommended from 'eslint-plugin-prettier/recommended';
+
+export default tseslint.config(
+  {
+    ignores: ['prod/**/*', 'jest.config.ts'],
+  },
+  eslint.configs.recommended,
+  ...tseslint.configs.recommended,
+  {
+    languageOptions: {
+      globals: {
+        ...globals.jest,
+        ...globals.node,
+      },
+    },
+  },
+  eslintPluginPrettierRecommended,
+);