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- 'use strict';
- var $RangeError = require('es-errors/range');
- var ToIntegerOrInfinity = require('./ToIntegerOrInfinity');
- var ToLength = require('./ToLength');
- var SameValue = require('./SameValue');
- // https://262.ecma-international.org/8.0/#sec-toindex
- module.exports = function ToIndex(value) {
- if (typeof value === 'undefined') {
- return 0;
- }
- var integerIndex = ToIntegerOrInfinity(value);
- if (integerIndex < 0) {
- throw new $RangeError('index must be >= 0');
- }
- var index = ToLength(integerIndex);
- if (!SameValue(integerIndex, index)) {
- throw new $RangeError('index must be >= 0 and < 2 ** 53 - 1');
- }
- return index;
- };
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