| 'use strict'; |
| |
| var GetIntrinsic = require('get-intrinsic'); |
| |
| var $TypeError = GetIntrinsic('%TypeError%'); |
| |
| var DefinePropertyOrThrow = require('./DefinePropertyOrThrow'); |
| var HasOwnProperty = require('./HasOwnProperty'); |
| var IsExtensible = require('./IsExtensible'); |
| var IsNonNegativeInteger = require('./IsNonNegativeInteger'); |
| var Type = require('./Type'); |
| |
| // https://262.ecma-international.org/11.0/#sec-setfunctionlength |
| |
| module.exports = function SetFunctionLength(F, length) { |
| if (typeof F !== 'function' || !IsExtensible(F) || HasOwnProperty(F, 'length')) { |
| throw new $TypeError('Assertion failed: `F` must be an extensible function and lack an own `length` property'); |
| } |
| if (Type(length) !== 'Number') { |
| throw new $TypeError('Assertion failed: `length` must be a Number'); |
| } |
| if (!IsNonNegativeInteger(length)) { |
| throw new $TypeError('Assertion failed: `length` must be an integer >= 0'); |
| } |
| return DefinePropertyOrThrow(F, 'length', { |
| '[[Configurable]]': true, |
| '[[Enumerable]]': false, |
| '[[Value]]': length, |
| '[[Writable]]': false |
| }); |
| }; |