31 lines
1.1 KiB
JavaScript
31 lines
1.1 KiB
JavaScript
|
'use strict';
|
||
|
|
var TO_STRING_TAG_SUPPORT = require('../internals/to-string-tag-support');
|
||
|
|
var isCallable = require('../internals/is-callable');
|
||
|
|
var classofRaw = require('../internals/classof-raw');
|
||
|
|
var wellKnownSymbol = require('../internals/well-known-symbol');
|
||
|
|
|
||
|
|
var TO_STRING_TAG = wellKnownSymbol('toStringTag');
|
||
|
|
var $Object = Object;
|
||
|
|
|
||
|
|
// ES3 wrong here
|
||
|
|
var CORRECT_ARGUMENTS = classofRaw(function () { return arguments; }()) === 'Arguments';
|
||
|
|
|
||
|
|
// fallback for IE11 Script Access Denied error
|
||
|
|
var tryGet = function (it, key) {
|
||
|
|
try {
|
||
|
|
return it[key];
|
||
|
|
} catch (error) { /* empty */ }
|
||
|
|
};
|
||
|
|
|
||
|
|
// getting tag from ES6+ `Object.prototype.toString`
|
||
|
|
module.exports = TO_STRING_TAG_SUPPORT ? classofRaw : function (it) {
|
||
|
|
var O, tag, result;
|
||
|
|
return it === undefined ? 'Undefined' : it === null ? 'Null'
|
||
|
|
// @@toStringTag case
|
||
|
|
: typeof (tag = tryGet(O = $Object(it), TO_STRING_TAG)) == 'string' ? tag
|
||
|
|
// builtinTag case
|
||
|
|
: CORRECT_ARGUMENTS ? classofRaw(O)
|
||
|
|
// ES3 arguments fallback
|
||
|
|
: (result = classofRaw(O)) === 'Object' && isCallable(O.callee) ? 'Arguments' : result;
|
||
|
|
};
|