'use strict';
|
|
var GetIntrinsic = require('get-intrinsic');
|
|
var $TypeError = GetIntrinsic('%TypeError%');
|
|
var DefinePropertyOrThrow = require('./DefinePropertyOrThrow');
|
var HasOwnProperty = require('./HasOwnProperty');
|
var IsExtensible = require('./IsExtensible');
|
var IsIntegralNumber = require('./IsIntegralNumber');
|
var Type = require('./Type');
|
|
// https://ecma-international.org/ecma-262/12.0/#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 (length !== Infinity && (!IsIntegralNumber(length) || length < 0)) {
|
throw new $TypeError('Assertion failed: `length` must be ∞, or an integer >= 0');
|
}
|
return DefinePropertyOrThrow(F, 'length', {
|
'[[Configurable]]': true,
|
'[[Enumerable]]': false,
|
'[[Value]]': length,
|
'[[Writable]]': false
|
});
|
};
|
