.eslintrc.js

module.exports = {
  root: true,
  env: {
    node: true
  },
  'extends': [
    'plugin:vue/recommended',
    '@vue/airbnb',
  ],
  settings: {
    'import/resolver': {
      webpack: {
        config: 'node_modules/@vue/cli-service/webpack.config.js',
      },
      node: {
        'extensions': [
          '.js',
          '.vue',
        ],
      },
    },
  },
  rules: {
    'max-len': 'warn',
    'no-unused-vars': 'warn',
    'no-trailing-spaces': 'warn',
    'no-param-reassign': ['error', {
      props: true,
      ignorePropertyModificationsFor: [
        'acc', // for reduce accumulators
        'e', // for e.returnvalue
        'state',
        'el',
      ]
    }],
    'comma-dangle': ['warn', 'always-multiline'],
    'import/prefer-default-export': 'warn',
    'semi': ['error', 'always', { 'omitLastInOneLineBlock': true }],
    'import/extensions': ['error', 'always', {
      'js': 'never',
      'vue': 'never',
    }],
    // allow optionalDependencies
    'import/no-extraneous-dependencies': 'off',
    'no-console': process.env.NODE_ENV === 'production' ? 'error' : 'off',
    'no-debugger': process.env.NODE_ENV === 'production' ? 'error' : 'off'
  },
  parserOptions: {
    parser: 'babel-eslint'
  }
}