| 'use strict'; |
| |
| var hasToStringTag = require('has-tostringtag/shams')(); |
| var callBound = require('call-bind/callBound'); |
| |
| var $toString = callBound('Object.prototype.toString'); |
| |
| var isStandardArguments = function isArguments(value) { |
| if (hasToStringTag && value && typeof value === 'object' && Symbol.toStringTag in value) { |
| return false; |
| } |
| return $toString(value) === '[object Arguments]'; |
| }; |
| |
| var isLegacyArguments = function isArguments(value) { |
| if (isStandardArguments(value)) { |
| return true; |
| } |
| return value !== null && |
| typeof value === 'object' && |
| typeof value.length === 'number' && |
| value.length >= 0 && |
| $toString(value) !== '[object Array]' && |
| $toString(value.callee) === '[object Function]'; |
| }; |
| |
| var supportsStandardArguments = (function () { |
| return isStandardArguments(arguments); |
| }()); |
| |
| isStandardArguments.isLegacyArguments = isLegacyArguments; // for tests |
| |
| module.exports = supportsStandardArguments ? isStandardArguments : isLegacyArguments; |