Commit

1 files changed, 31 insertions, 0 deletions

diff --git a/src/node_modules/es-abstract/2018/SetFunctionLength.js b/src/node_modules/es-abstract/2018/SetFunctionLength.js
new file mode 100644
index 0000000..cb24496
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+++ b/src/node_modules/es-abstract/2018/SetFunctionLength.js
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+'use strict';
+
+var GetIntrinsic = require('../GetIntrinsic');
+
+var $TypeError = GetIntrinsic('%TypeError%');
+
+var DefinePropertyOrThrow = require('./DefinePropertyOrThrow');
+var HasOwnProperty = require('./HasOwnProperty');
+var IsExtensible = require('./IsExtensible');
+var ToInteger = require('./ToInteger');
+var Type = require('./Type');
+
+// https://ecma-international.org/ecma-262/9.0/#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 (Type(length) !== 'Number') {
+		throw new $TypeError('Assertion failed: `length` must be a Number');
+	}
+	if (length < 0 || ToInteger(length) !== length) {
+		throw new $TypeError('Assertion failed: `length` must be an integer >= 0');
+	}
+	return DefinePropertyOrThrow(F, 'length', {
+		'[[Configurable]]': true,
+		'[[Enumerable]]': false,
+		'[[Value]]': length,
+		'[[Writable]]': false
+	});
+};