My Next.js eslint config + `npm install --save-dev eslint eslint-plugin-react babel-eslint`

.eslintignore

.next
out

.eslintrc.json

{
  "parser": "babel-eslint",
  "env": {
    "browser": true,
    "es6": true,
    "commonjs": true
  },
  "globals": {
    "process": true
  },
  "extends": "eslint:recommended",
  "parserOptions": {
    "ecmaVersion": 9,
    "ecmaFeatures": {
      "jsx": true
    },
    "sourceType": "module"
  },
  "plugins": [
    "react"
  ],
  "rules": {
    "react/prop-types": 0,
    "react/jsx-uses-vars": [
      2
    ],
    "react/jsx-no-undef": "error",
    "no-console": 0
  }
}