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27 lines
1009 B
27 lines
1009 B
4 years ago
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var TO_STRING_TAG_SUPPORT = require('../internals/to-string-tag-support');
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var classofRaw = require('../internals/classof-raw');
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var wellKnownSymbol = require('../internals/well-known-symbol');
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var TO_STRING_TAG = wellKnownSymbol('toStringTag');
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// ES3 wrong here
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var CORRECT_ARGUMENTS = classofRaw(function () { return arguments; }()) == 'Arguments';
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// fallback for IE11 Script Access Denied error
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var tryGet = function (it, key) {
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try {
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return it[key];
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} catch (error) { /* empty */ }
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};
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// getting tag from ES6+ `Object.prototype.toString`
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module.exports = TO_STRING_TAG_SUPPORT ? classofRaw : function (it) {
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var O, tag, result;
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return it === undefined ? 'Undefined' : it === null ? 'Null'
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// @@toStringTag case
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: typeof (tag = tryGet(O = Object(it), TO_STRING_TAG)) == 'string' ? tag
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// builtinTag case
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: CORRECT_ARGUMENTS ? classofRaw(O)
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// ES3 arguments fallback
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: (result = classofRaw(O)) == 'Object' && typeof O.callee == 'function' ? 'Arguments' : result;
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};
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