.eslintrc.js

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

module.exports = {
  root: true,
  parser: 'babel-eslint',
  parserOptions: {
    sourceType: 'module',
  },
  env: {
    browser: true,
  },
  // https://github.com/feross/standard/blob/master/RULES.md#javascript-standard-style
  extends: 'standard',
  // required to lint *.vue files
  plugins: ['html'],
  // add your custom rules here
  rules: {
    indent: ['error', 2],
    'one-var': ['error', 'always'],
    // allow paren-less arrow functions
    'arrow-parens': 0,
    // allow async-await
    'generator-star-spacing': 0,
    // allow debugger during development
    'no-debugger': process.env.NODE_ENV === 'production' ? 2 : 0,
    'comma-dangle': [
      'error',
      {
        arrays: 'never',
        objects: 'never',
        imports: 'never',
        exports: 'never',
        functions: 'never',
      },
    ],
    semi: ['error', 'always', { omitLastInOneLineBlock: true }],
    quotes: ['error', 'single'],
    'space-before-function-paren': 'off',
  },
};