<html>
<head>
<base href="https://bugs.webkit.org/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Arrow Function before super() causes TDZ, should it?"
href="https://bugs.webkit.org/show_bug.cgi?id=149338">149338</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Arrow Function before super() causes TDZ, should it?
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>Product</th>
<td>WebKit
</td>
</tr>
<tr>
<th>Version</th>
<td>WebKit Nightly Build
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Unspecified
</td>
</tr>
<tr>
<th>OS</th>
<td>Unspecified
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>Normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P2
</td>
</tr>
<tr>
<th>Component</th>
<td>JavaScriptCore
</td>
</tr>
<tr>
<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>joepeck@webkit.org
</td>
</tr>
<tr>
<th>CC</th>
<td>bburg@apple.com, gskachkov@gmail.com, sbarati@apple.com, utatane.tea@gmail.com
</td>
</tr></table>
<p>
<div>
<pre>* SUMMARY
Arrow Function before super() causes TDZ, should it?
You get a non-obvious TDZ runtime ReferenceError when you create an arrow function before calling super() in a subclass.
* TEST
<script>
class Parent { }
class Subclass extends Parent {
constructor() {
let x = () => {}; // TDZ because of capturing "this"
super();
}
}
console.log(new Subclass);
</script>
* PRODUCES
[Error] ReferenceError: Cannot access uninitialized variable.
Subclass
(anonymous function)</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are the assignee for the bug.</li>
</ul>
</body>
</html>