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node_modules/es-abstract/2019/StringGetOwnProperty.js
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1lostsun
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05 май 2025, 11:35
05 май 2025, 11:35
fe8f535
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'use strict'; var $TypeError = require('es-errors/type'); var callBound = require('call-bound'); var $charAt = callBound('String.prototype.charAt'); var $stringToString = callBound('String.prototype.toString'); var CanonicalNumericIndexString = require('./CanonicalNumericIndexString'); var IsInteger = require('./IsInteger'); var isObject = require('../helpers/isObject'); var isPropertyKey = require('../helpers/isPropertyKey'); var isNegativeZero = require('math-intrinsics/isNegativeZero'); // https://262.ecma-international.org/8.0/#sec-stringgetownproperty module.exports = function StringGetOwnProperty(S, P) { var str; if (isObject(S)) { try { str = $stringToString(S); } catch (e) { /**/ } } if (typeof str !== 'string') { throw new $TypeError('Assertion failed: `S` must be a boxed string object'); } if (!isPropertyKey(P)) { throw new $TypeError('Assertion failed: P is not a Property Key'); } if (typeof P !== 'string') { return void undefined; } var index = CanonicalNumericIndexString(P); var len = str.length; if (typeof index === 'undefined' || !IsInteger(index) || isNegativeZero(index) || index < 0 || len <= index) { return void undefined; } var resultStr = $charAt(S, index); return { '[[Configurable]]': false, '[[Enumerable]]': true, '[[Value]]': resultStr, '[[Writable]]': false }; };