1'use strict'; 2 3var ES2016 = require('./es2016'); 4var assign = require('./helpers/assign'); 5 6var ES2017 = assign(assign({}, ES2016), { 7 ToIndex: function ToIndex(value) { 8 if (typeof value === 'undefined') { 9 return 0; 10 } 11 var integerIndex = this.ToInteger(value); 12 if (integerIndex < 0) { 13 throw new RangeError('index must be >= 0'); 14 } 15 var index = this.ToLength(integerIndex); 16 if (!this.SameValueZero(integerIndex, index)) { 17 throw new RangeError('index must be >= 0 and < 2 ** 53 - 1'); 18 } 19 return index; 20 } 21}); 22 23delete ES2017.EnumerableOwnNames; // replaced with EnumerableOwnProperties 24 25module.exports = ES2017; 26