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- 'use strict';
- var GetIntrinsic = require('get-intrinsic');
- var $concat = GetIntrinsic('%Array.prototype.concat%');
- var callBind = require('call-bind');
- var callBound = require('call-bind/callBound');
- var $slice = callBound('Array.prototype.slice');
- var hasSymbols = require('has-symbols/shams')();
- var isConcatSpreadable = hasSymbols && Symbol.isConcatSpreadable;
- var empty = [];
- var $concatApply = isConcatSpreadable ? callBind.apply($concat, empty) : null;
- var $concatCall = isConcatSpreadable ? null : callBind($concat, empty);
- var isArray = isConcatSpreadable ? require('isarray') : null;
- module.exports = isConcatSpreadable
- // eslint-disable-next-line no-unused-vars
- ? function safeArrayConcat(item) {
- for (var i = 0; i < arguments.length; i += 1) {
- var arg = arguments[i];
- if (arg && typeof arg === 'object' && typeof arg[isConcatSpreadable] === 'boolean') {
- if (!empty[isConcatSpreadable]) {
- empty[isConcatSpreadable] = true;
- }
- var arr = isArray(arg) ? $slice(arg) : [arg];
- arr[isConcatSpreadable] = true; // shadow the property. TODO: use [[Define]]
- arguments[i] = arr;
- }
- }
- return $concatApply(arguments);
- }
- : $concatCall;
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