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