.eslintrc.js

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

module.exports = {
  root: true,
  parserOptions: {
    parser: 'babel-eslint',
    ecmaVersion: 2018,
    sourceType: 'module'
  },
  env: {
    browser: true,
  },
  extends: [
    'airbnb-base',
    'plugin:vue/essential'
  ],
  // required to lint *.vue files
  plugins: [
    'json',
    'vue',
  ],
  // check if imports actually resolve
  settings: {
    'import/resolver': 'webpack',
    'alias': [
      ['@', './src']
    ]
  },
  // settings: {
  //   'import/resolver': {
  //     webpack: {
  //       config: 'build/webpack.base.conf.js'
  //     }
  //   }
  // },
  // add your custom rules here
  rules: {
    'indent': ['warn', 2, {
      SwitchCase: 1,
      MemberExpression: 0
    }],
    'semi': ['error', 'never'],
    'comma-dangle': ['error', 'never'],
    'arrow-parens': ['warn', 'as-needed'],
    'no-plusplus': ['off'],
    // don't require .vue extension when importing
    'import/extensions': ['error', 'never', {
      js: 'never',
      vue: 'never'
    }],
    // disallow reassignment of function parameters
    // disallow parameter object manipulation except for specific exclusions
    'no-param-reassign': ['error', {
      props: true,
      ignorePropertyModificationsFor: [
        'state', // for vuex state
        'acc', // for reduce accumulators
        'e' // for e.returnvalue
      ]
    }],
    // allow optionalDependencies
    'import/no-extraneous-dependencies': ['error', {
      optionalDependencies: ['test/unit/index.js']
    }],
    // allow console and debugger during development
    'no-console': process.env.NODE_ENV === 'production' ? 'error' : 'off',
    'no-debugger': process.env.NODE_ENV === 'production' ? 'error' : 'off'
  }
}