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40 lines
1.1 KiB
40 lines
1.1 KiB
'use strict'; |
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var GetIntrinsic = require('get-intrinsic'); |
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var $Object = GetIntrinsic('%Object%'); |
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var $StringPrototype = GetIntrinsic('%String.prototype%'); |
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var $SyntaxError = GetIntrinsic('%SyntaxError%'); |
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var $TypeError = GetIntrinsic('%TypeError%'); |
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var DefinePropertyOrThrow = require('./DefinePropertyOrThrow'); |
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var Type = require('./Type'); |
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var setProto = require('../helpers/setProto'); |
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// https://262.ecma-international.org/6.0/#sec-stringcreate |
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module.exports = function StringCreate(value, prototype) { |
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if (Type(value) !== 'String') { |
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throw new $TypeError('Assertion failed: `S` must be a String'); |
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} |
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var S = $Object(value); |
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if (S !== $StringPrototype) { |
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if (setProto) { |
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setProto(S, prototype); |
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} else { |
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throw new $SyntaxError('StringCreate: a `proto` argument that is not `String.prototype` is not supported in an environment that does not support setting the [[Prototype]]'); |
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} |
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} |
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var length = value.length; |
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DefinePropertyOrThrow(S, 'length', { |
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'[[Configurable]]': false, |
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'[[Enumerable]]': false, |
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'[[Value]]': length, |
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'[[Writable]]': false |
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}); |
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return S; |
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};
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