Answers for "line 8:21: 'useref' is not defined no-undef"

'useState' is not defined no-undef

import React, { useState } from "react";

process' is not defined.eslint no-undef

in your eslint file .eslintrc.json or .eslintrc.js file
make sure you include either node or browser "true"

check example

module.exports = {
  env: {
    node: true,
    browser: true,
    es6: true,
  },
}