.eslintrc.js

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

module.exports = {
  root: true,
  parserOptions: {
    'parser': 'babel-eslint',
    sourceType: 'module'
  },
  env: {
    browser: true,
  },
  // https://github.com/feross/standard/blob/master/RULES.md#javascript-standard-style
  extends: 'airbnb-base',
  // required to lint *.vue files
  plugins: [	
    'html',
    'flowtype-errors'
  ],
  // check if imports actually resolve
  'settings': {
    'import/resolver': {
      'webpack': {
        'config': 'build/webpack.base.conf.js'
      }
    }
  },
  'globals': {
    '$store': true,
    '$route': true,
  },
  // add your custom rules here
  'rules': {
    // don't require .vue extension when importing
    'import/extensions': ['error', 'always', {
      'js': 'never',
      'vue': 'never'
    }],
    // allow optionalDependencies
    'import/no-extraneous-dependencies': ['error', {
      'optionalDependencies': ['test/unit/index.js']
    }],
    // allow debugger during development
    'no-debugger': process.env.NODE_ENV === 'production' ? 2 : 0,
    'no-console': process.env.NODE_ENV === 'production' ? 0 : 0,
    // allow named export
    // 'import/prefer-default-export': 0,
    'arrow-body-style': 1,
    'no-mixed-operators': 0,
    // space after function name
    'space-before-function-paren': ["error", "always"],
    'no-confusing-arrow': 0,
    'flowtype-errors/show-errors': 2,
    'no-shadow': ["error", { "allow": ["state", "getters"] }],
    'no-param-reassign': ["error", { "props": true, "ignorePropertyModificationsFor": ["state"] }]
  }
}