chore: setup ESLint and Prettier

Author: Kocal

.prettierrc.json

@@ -3,6 +3,34 @@
     "workspaces": ["src/*/Resources/assets"],
     "scripts": {
         "build": "yarn workspaces run build",
-        "test": "yarn workspaces run test"
+        "test": "yarn workspaces run test",
+        "lint": "eslint src/*/Resources/assets/{src,test}/*.js --fix",
+        "format": "prettier src/*/Resources/assets/{src,test}/*.js {,src/*/}*.{json,md} --write",
+        "check-lint": "yarn lint --no-fix",
+        "check-format": "yarn format --no-write --check"
+    },
+    "devDependencies": {
+        "eslint": "^7.15.0",
+        "@babel/eslint-parser": "^7.12.1",
+        "eslint-config-prettier": "^6.15.0",
+        "prettier": "^2.2.1"
+    },
+    "eslintConfig": {
+        "root": true,
+        "parserOptions": {
+            "sourceType": "module",
+            "ecmaVersion": 11
+        },
+        "extends": [
+            "eslint:recommended",
+            "prettier"
+        ]
+    },
+    "prettier": {
+        "printWidth": 120,
+        "trailingComma": "es5",
+        "tabWidth": 4,
+        "jsxBracketSameLine": true,
+        "singleQuote": true
     }
 }