.eslintrc.js

module.exports = {
  env: {
    browser: true,
    es6: true
  },
  parserOptions: {
    sourceType: 'module',
  },
  extends: 'google',
  rules: {
    'max-len': [ 'warn',
      { code: 130 }  // 130 on GitHub, 80 on npmjs.org for README.md code blocks
    ],
    'arrow-parens': ['error', 'as-needed'],
    'space-before-function-paren': [
      'error',
      {
        anonymous: 'always',
        named: 'never'
      }
    ],
    'no-negated-condition': 'warn',
    'spaced-comment': ['error', 'always', { exceptions: ['/'] }]
  },
  globals: {
    DOMException: false,
    MediaStream: false,
    Polymer: false,
    URL: false,
  }
};