.eslintrc.js

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

module.exports = {
  root: true,
  parserOptions: {
    parser: 'babel-eslint',
    sourceType: 'module'
  },
  env: {
    browser: true,
    node: true,
    mocha: true
  },
  extends: [
    'airbnb-base',
    'plugin:vue/strongly-recommended'
  ],
  settings: {
    'import/resolver': {
      webpack: {
        config: '.eslint.webpack.config.js'
      }
    }
  },
  // add your custom rules here
  rules: {
    // don't require .vue extension when importing
    'import/extensions': ['error', 'always', {
      'js': 'never',
      'vue': 'never'
    }],
    'vue/html-self-closing': ['error', {
      'html': {
        'void': 'any',
        'normal': 'any',
        'component': 'any'
      },
      'svg': 'always',
      'math': 'always'
    }],
    'vue/attribute-hyphenation': [2, 'always'],
    'max-len': [0, 100, {
      ignoreStrings: true,
    }],
    // allow optionalDependencies
    'import/no-extraneous-dependencies': ['error', {
      'optionalDependencies': ['test/unit/index.js']
    }],
    // allow debugger during development
    'no-console': process.env.NODE_ENV === 'production' ? 'error' : 'off',
    'no-debugger': process.env.NODE_ENV === 'production' ? 'error' : 'off',

    'operator-linebreak': 'off',
    'implicit-arrow-linebreak': 'off',
    'object-curly-newline': 'off',
    'no-else-return': 'off',
    'no-multiple-empty-lines': 'off',
    'lines-between-class-members': 'off',
    'import/order': 'off',
  }
}