/*!
 * array-to-error | MIT (c) Shinnosuke Watanabe
 * https://github.com/shinnn/array-to-error
*/
(function() {
  'use strict';

  function isNotString(item) {
    return typeof item !== 'string';
  }

  window.arrayToError = function arrayToError(arr, ErrorConstructor) {
    if (!Array.isArray(arr)) {
      throw new TypeError(
        arr +
        ' is not an array. Expected an array of error messages.'
      );
    }

    var nonStringValues = arr.filter(isNotString);
    if (nonStringValues.length !== 0) {
      var isPrural = nonStringValues.length > 1;
      throw new TypeError(
        window.arrayToSentence(nonStringValues) +
        ' ' +
        (isPrural ? 'are' : 'is') +
        ' not ' +
        (isPrural ? 'strings' : 'a string') +
        '. Expected every item in the array is an error message string.'
      );
    }

    if (ErrorConstructor !== undefined) {
      if (typeof ErrorConstructor !== 'function') {
        throw new TypeError(
          ErrorConstructor +
          ' is not a function. Expected an error constructor.'
        );
      }
    } else {
      ErrorConstructor = Error;
    }

    var error = new ErrorConstructor(arr.join('\n'));
    error.reasons = arr;

    return error;
  };
})();