text: import assertString from './util/assertString';
  import toString from './util/toString';
  
  export default function isIn(str, options) {
    assertString(str);
    let i;
    if (Object.prototype.toString.call(options) === '[object Array]') {
      const array = [];
      for (i in options) {
        // https://github.com/gotwarlost/istanbul/blob/master/ignoring-code-for-coverage.md#ignoring-code-for-coverage-purposes
        // istanbul ignore else
        if ({}.hasOwnProperty.call(options, i)) {
          array[i] = toString(options[i]);
        }
      }
      return array.indexOf(str) >= 0;
    } else if (typeof options === 'object') {
      return options.hasOwnProperty(str);
    } else if (options && typeof options.indexOf === 'function') {
      return options.indexOf(str) >= 0;
    }
    return false;
  }
  