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