ESLint configuration.

.eslint.json

{
  "root": true,
  "env": {
    "browser": true,
    "es6": true
  },
  "plugins": [
    "wordpress",
    "async"
  ],
  "extends": [
    "eslint:recommended",
    "plugin:wordpress/recommended"
  ],
  "parserOptions": {
    "ecmaVersion": 2017,
    "ecmaFeatures": {
      "experimentalObjectRestSpread": true,
      "jsx": true
    },
    "sourceType": "module"
  },
  "rules": {
    "async/missing-await-in-async-fn": 1
  }
}