Add Babel and ESLint configuration files

.babelrc

@@ -0,0 +1,6 @@
+{
+  "presets": [
+      "@babel/preset-react"
+  ],
+  "plugins": ["@babel/plugin-syntax-jsx"]
+}

.eslintrc.json

@@ -0,0 +1,35 @@
+{
+  "env": {
+    "browser": true,
+    "es6": true,
+    "jest": true
+  },
+  "parser": "@babel/eslint-parser",
+  "parserOptions": {
+    "ecmaFeatures": {
+      "jsx": true
+    },
+    "ecmaVersion": 2018,
+    "sourceType": "module"
+  },
+  "extends": ["airbnb", "plugin:react/recommended", "plugin:react-hooks/recommended"],
+  "plugins": ["react"],
+  "rules": {
+    "react/jsx-filename-extension": ["warn", { "extensions": [".js", ".jsx"] }],
+    "react/react-in-jsx-scope": "off",
+    "import/no-unresolved": "off",
+    "no-shadow": "off"
+  },
+  "overrides": [
+    {
+       // feel free to replace with your preferred file pattern - eg. 'src/**/*Slice.js' or 'redux/**/*Slice.js'
+      "files": ["src/**/*Slice.js"],
+      // avoid state param assignment
+      "rules": { "no-param-reassign": ["error", { "props": false }] }
+    }
+  ],
+  "ignorePatterns": [
+    "dist/",
+    "build/"
+  ]
+}