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25 lines
626 B
25 lines
626 B
'use strict'; |
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var GetIntrinsic = require('get-intrinsic'); |
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var $isConcatSpreadable = GetIntrinsic('%Symbol.isConcatSpreadable%', true); |
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var Get = require('./Get'); |
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var IsArray = require('./IsArray'); |
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var ToBoolean = require('./ToBoolean'); |
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var Type = require('./Type'); |
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// https://ecma-international.org/ecma-262/6.0/#sec-isconcatspreadable |
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module.exports = function IsConcatSpreadable(O) { |
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if (Type(O) !== 'Object') { |
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return false; |
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} |
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if ($isConcatSpreadable) { |
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var spreadable = Get(O, $isConcatSpreadable); |
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if (typeof spreadable !== 'undefined') { |
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return ToBoolean(spreadable); |
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} |
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} |
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return IsArray(O); |
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};
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