old_contents: module.exports = {
    extends: 'airbnb/base',
    env: {
      'browser': true,
      'mocha': true,
      'node': true
    },
    rules: {
      'class-methods-use-this': 'off',
      'comma-dangle': ['error', 'never'],
      'consistent-return': 'off',
      'func-names': 'off',
      'import/no-extraneous-dependencies': 'off',
      'import/no-unresolved': 'off',
      'max-len': 'off',
      'no-bitwise': 'off',
      'no-continue': 'off',
      'no-empty': 'off',
      'no-multi-assign': 'off',
      'no-new': 'off',
      'no-param-reassign': 'off',
      'no-plusplus': 'off',
      'no-restricted-syntax': 'off',
      'no-underscore-dangle': 'off',
      'no-use-before-define': 'off'
    }
  };
  
new_contents: module.exports = {
    extends: 'airbnb/base',
    env: {
      'browser': true,
      'mocha': true,
      'node': true
    },
    rules: {
      'class-methods-use-this': 'off',
      'comma-dangle': ['error', 'never'],
      'consistent-return': 'off',
      'func-names': 'off',
      'import/no-extraneous-dependencies': 'off',
      'import/no-unresolved': 'off',
      'max-len': 'off',
      'no-bitwise': 'off',
      'no-continue': 'off',
      'no-empty': 'off',
      'no-multi-assign': 'off',
      'no-new': 'off',
      'no-param-reassign': 'off',
      'no-plusplus': 'off',
      'no-restricted-syntax': 'off',
      'no-underscore-dangle': 'off', // https://github.com/apiaryio/dredd-transactions/pull/179#discussion_r206852270
      'no-use-before-define': 'off'
    }
  };
  
subject: document why no-underscore-dangle is off