'use strict'; 
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// TODO: Remove from `core-js@4` 
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var DESCRIPTORS = require('../internals/descriptors'); 
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var addToUnscopables = require('../internals/add-to-unscopables'); 
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var toObject = require('../internals/to-object'); 
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var lengthOfArrayLike = require('../internals/length-of-array-like'); 
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var defineBuiltInAccessor = require('../internals/define-built-in-accessor'); 
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// `Array.prototype.lastIndex` getter 
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// https://github.com/keithamus/proposal-array-last 
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if (DESCRIPTORS) { 
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  defineBuiltInAccessor(Array.prototype, 'lastIndex', { 
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    configurable: true, 
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    get: function lastIndex() { 
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      var O = toObject(this); 
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      var len = lengthOfArrayLike(O); 
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      return len === 0 ? 0 : len - 1; 
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    } 
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  }); 
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  addToUnscopables('lastIndex'); 
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} 
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