lib/error-is.js
function errorIs(error, criteria) {

  /* This function only deals with errors! */
  if (!(error instanceof Error)) {
    return false;
  }

  /* Falsy criteria matches everything (catch-all) */
  if (!criteria) {
    return true;
  }

  /* If criteria is a constructor... */
  if (typeof criteria === 'function') {
    return error instanceof criteria;
  }

  var name = error.name || error.constructor && error.constructor.name || '';

  /* If criteria is a string... */
  if (typeof criteria === 'string') {
    return name.toLowerCase() === criteria.toLowerCase();
  }

  /* If criteria is a regex... */
  if (criteria instanceof RegExp) {
    return criteria.test(name);
  }

  /* Object: do a deep match */
  if (typeof criteria === 'object') {
    return _lodash2['default'].every(Object.keys(criteria), function (key) {
      return _lodash2['default'].matchesProperty(key, criteria[key])(error);
    });
  }

  /* Have no idea what the criteria is... */
  throw new Error('Unexpected criteria type: ' + criteria);
}
function errorIs(error, criteria) {

  /* This function only deals with errors! */
  if (!(error instanceof Error)) {
    return false;
  }

  /* Falsy criteria matches everything (catch-all) */
  if (!criteria) {
    return true;
  }

  /* If criteria is a constructor... */
  if (typeof criteria === 'function') {
    return error instanceof criteria;
  }

  var name = error.name || error.constructor && error.constructor.name || '';

  /* If criteria is a string... */
  if (typeof criteria === 'string') {
    return name.toLowerCase() === criteria.toLowerCase();
  }

  /* If criteria is a regex... */
  if (criteria instanceof RegExp) {
    return criteria.test(name);
  }

  /* Object: do a deep match */
  if (typeof criteria === 'object') {
    return _lodash2['default'].every(Object.keys(criteria), function (key) {
      return _lodash2['default'].matchesProperty(key, criteria[key])(error);
    });
  }

  /* Have no idea what the criteria is... */
  throw new Error('Unexpected criteria type: ' + criteria);
}
errorIs(2)

@description                Checks whether the error is of the specified
criteria:
1) falsy: returns true;
2) function: checks whether error is instance
of the given constructor;
3) string: checks if error name is equal the
string, case insesitive;
4) regex: checks if error name matches the
regex;
5) otherwise: throw.
@param          {error}     The error instance to check.
@param          {criteria}  The type to check against, see description.
@return         {boolean}   True if error matches, false otherwise.