.eslintrc.js

// https://eslint.org/docs/user-guide/configuring

module.exports = {
  root: true,
  parserOptions: {
    parser: 'babel-eslint',
    ecmaFeatures: {
      jsx: true,
    },
    sourceType: 'module',
  },
  env: {
    browser: true,
    commonjs: true,
    es6: true,
    node: true,
  },
  globals: {
    $: 'readonly',
  },
  extends: [
    'airbnb-base',
    'plugin:react/recommended',
  ],
  plugins: [
    'react',
  ],
  // add your custom rules here
  rules: {
    // allow async-await
    'generator-star-spacing': 'off',
    // allow debugger during development
    'no-debugger': process.env.NODE_ENV === 'production' ? 'error' : 'off',
    // allow unresolved module and extensions, because webpack will handle
    // this part
    'import/no-unresolved': 'off',
    'import/extensions': 'off',
    'import/no-extraneous-dependencies': 'off',
    // allow param reassign or the param's properties
    'no-param-reassign': ['error', { props: false }],
    'max-len': ['error', { code: 80 }],
    'operator-linebreak': 'off',
    // allow prefix private functions with underscore
    'no-underscore-dangle': 'off',
  },
};