.

Author: ChristianOellers

.babelrc.json

@@ -0,0 +1,11 @@
+{
+  "plugins": ["@babel/plugin-proposal-class-properties"],
+  "presets": [
+    [
+      "@babel/preset-env",
+      {
+        "modules": false
+      }
+    ]
+  ]
+}

.eslintrc.js

@@ -3,12 +3,32 @@ module.exports = {
     browser: true,
     es2021: true,
   },
-  extends: ['airbnb', 'prettier', 'plugin:prettier/recommended'],
-  plugins: ['import', 'prettier'],
+  extends: ['airbnb', 'prettier'],
+  plugins: ['import', 'promise', 'prettier'],
+  parser: '@babel/eslint-parser',
   parserOptions: {
     ecmaVersion: 12,
+    sourceType: 'module',
   },
   rules: {
-    'class-methods-use-this': false,
+    // Native
+    'class-methods-use-this': [0],
+    'new-cap': 0,
+    'no-restricted-syntax': 0,
+    'no-unused-vars': ['error', { varsIgnorePattern: '^_' }],
+
+    // Plugins
+    'promise/always-return': 'error',
+    'promise/avoid-new': 'warn',
+    'promise/catch-or-return': 'error',
+    'promise/no-callback-in-promise': 'warn',
+    'promise/no-native': 'off',
+    'promise/no-nesting': 'warn',
+    'promise/no-new-statics': 'error',
+    'promise/no-promise-in-callback': 'warn',
+    'promise/no-return-in-finally': 'warn',
+    'promise/no-return-wrap': 'error',
+    'promise/param-names': 'error',
+    'promise/valid-params': 'warn',
   },
 };

jest.config.json

@@ -1,5 +1,6 @@
 {
   "testEnvironment": "node",
   "verbose": true,
+  "modulePathIgnorePatterns": ["<rootDir>/coverage/", "<rootDir>/docs/"],
   "testMatch": ["**/tests/**/*.test.js"]
 }

package.json

@@ -14,13 +14,21 @@
     "project:reset": "rm -rf node_modules"
   },
   "dependencies": {
+    "@babel/core": "^7.12.10",
+    "@babel/eslint-parser": "^7.12.1",
+    "@babel/plugin-proposal-class-properties": "^7.12.1",
+    "@babel/preset-env": "^7.12.11",
+    "autoprefixer": "^10.2.1",
+    "babel-jest": "^26.6.3",
+    "babel-loader": "^8.2.2",
     "eslint": "^7.18.0",
     "eslint-config-airbnb": "^18.2.0",
     "eslint-config-airbnb-base": "^14.2.1",
     "eslint-config-prettier": "^7.2.0",
     "eslint-plugin-import": "^2.22.1",
     "eslint-plugin-jsx-a11y": "^6.4.1",
     "eslint-plugin-prettier": "^3.3.1",
+    "eslint-plugin-promise": "^4.2.1",
     "eslint-plugin-react": "^7.22.0",
     "eslint-plugin-react-hooks": "^4.2.0",
     "jest": "^26.6.3",