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28 lines
984 B
28 lines
984 B
'use strict'; |
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var $TypeError = require('es-errors/type'); |
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var isInteger = require('math-intrinsics/isInteger'); |
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var DefinePropertyOrThrow = require('./DefinePropertyOrThrow'); |
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var HasOwnProperty = require('./HasOwnProperty'); |
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var IsExtensible = require('./IsExtensible'); |
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// https://262.ecma-international.org/9.0/#sec-setfunctionlength |
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module.exports = function SetFunctionLength(F, length) { |
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if (typeof F !== 'function' || !IsExtensible(F) || HasOwnProperty(F, 'length')) { |
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throw new $TypeError('Assertion failed: `F` must be an extensible function and lack an own `length` property'); |
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} |
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if (typeof length !== 'number') { |
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throw new $TypeError('Assertion failed: `length` must be a Number'); |
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} |
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if (length < 0 || !isInteger(length)) { |
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throw new $TypeError('Assertion failed: `length` must be an integer >= 0'); |
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} |
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return DefinePropertyOrThrow(F, 'length', { |
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'[[Configurable]]': true, |
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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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};
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