source: imaps-frontend/node_modules/es-abstract/2018/SetFunctionLength.js

'use strict';

var $TypeError = require('es-errors/type');

var DefinePropertyOrThrow = require('./DefinePropertyOrThrow');
var HasOwnProperty = require('./HasOwnProperty');
var IsExtensible = require('./IsExtensible');

var isInteger = require('../helpers/isInteger');

// https://262.ecma-international.org/9.0/#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 (typeof length !== 'number') {
                throw new $TypeError('Assertion failed: `length` must be a Number');
        }
        if (length < 0 || !isInteger(length)) {
                throw new $TypeError('Assertion failed: `length` must be an integer >= 0');
        }
        return DefinePropertyOrThrow(F, 'length', {
                '[[Configurable]]': true,
                '[[Enumerable]]': false,
                '[[Value]]': length,
                '[[Writable]]': false
        });
};