is-string/is-string.js

'use strict';

/* Derived from `is-string 1.0.7`, under MIT license, (c) 2015 Jordan Harband.
   This version removes the try/catch for performance reasons, and replaces it with a test that unfortunately does not work on cross-realm values, pending an upstream fix. */

var toStr = Object.prototype.toString;
var strClass = '[object String]';
var hasToStringTag = require('has-tostringtag/shams')();

module.exports = function isString(value) {
	if (typeof value === 'string') {
		return true;
	}
	if (typeof value !== 'object') {
		return false;
	}
	return hasToStringTag ? value instanceof String : toStr.call(value) === strClass;
};