Fix ESLint setup (#240)

Author: friederbluemle

template/_eslintrc.js

@@ -1,8 +1,10 @@
 module.exports = {
   root: true,
   extends: '@react-native-community',
+  parser: '@typescript-eslint/parser',
+  plugins: ['@typescript-eslint'],
   rules: {
-    "no-shadow": "off",
-    "@typescript-eslint/no-shadow": ["error"],
+    'no-shadow': 'off',
+    '@typescript-eslint/no-shadow': ['error'],
   },
 };

template/package.json

@@ -20,6 +20,8 @@
     "@types/jest": "^26.0.23",
     "@types/react-native": "^0.66.4",
     "@types/react-test-renderer": "^17.0.1",
+    "@typescript-eslint/eslint-plugin": "^5.7.0",
+    "@typescript-eslint/parser": "^5.7.0",
     "babel-jest": "^26.6.3",
     "eslint": "^7.14.0",
     "jest": "^26.6.3",