SetFunctionName.js

'use strict';

var GetIntrinsic = require('../GetIntrinsic');

var has = require('has');

var $TypeError = GetIntrinsic('%TypeError%');

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

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

// https://ecma-international.org/ecma-262/6.0/#sec-setfunctionname

module.exports = function SetFunctionName(F, name) {
	if (typeof F !== 'function') {
		throw new $TypeError('Assertion failed: `F` must be a function');
	}
	if (!IsExtensible(F) || has(F, 'name')) {
		throw new $TypeError('Assertion failed: `F` must be extensible, and must not have a `name` own property');
	}
	var nameType = Type(name);
	if (nameType !== 'Symbol' && nameType !== 'String') {
		throw new $TypeError('Assertion failed: `name` must be a Symbol or a String');
	}
	if (nameType === 'Symbol') {
		var description = getSymbolDescription(name);
		// eslint-disable-next-line no-param-reassign
		name = typeof description === 'undefined' ? '' : '[' + description + ']';
	}
	if (arguments.length > 2) {
		var prefix = arguments[2];
		// eslint-disable-next-line no-param-reassign
		name = prefix + ' ' + name;
	}
	return DefinePropertyOrThrow(F, 'name', {
		'[[Value]]': name,
		'[[Writable]]': false,
		'[[Enumerable]]': false,
		'[[Configurable]]': true
	});
};