'use strict'; 
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var $ = require('../internals/export'); 
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var $findLastIndex = require('../internals/array-iteration-from-last').findLastIndex; 
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var addToUnscopables = require('../internals/add-to-unscopables'); 
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// `Array.prototype.findLastIndex` method 
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// https://tc39.es/ecma262/#sec-array.prototype.findlastindex 
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$({ target: 'Array', proto: true }, { 
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  findLastIndex: function findLastIndex(callbackfn /* , that = undefined */) { 
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    return $findLastIndex(this, callbackfn, arguments.length > 1 ? arguments[1] : undefined); 
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  } 
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}); 
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addToUnscopables('findLastIndex'); 
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