SB-6.1-PRE

node_modules/es-abstract/2020/SetFunctionLength.js

@@ -0,0 +1,31 @@
+'use strict';
+
+var GetIntrinsic = require('../GetIntrinsic');
+
+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://tc39.es/ecma262/2020/#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
+	});
+};