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<base href="https://bugs.webkit.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - ES2015 modules - Export default function hoisting"
href="https://bugs.webkit.org/show_bug.cgi?id=170174">170174</a>
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<th>Summary</th>
<td>ES2015 modules - Export default function hoisting
</td>
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<th>Product</th>
<td>WebKit
</td>
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<th>Version</th>
<td>Safari Technology Preview
</td>
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<th>Hardware</th>
<td>Unspecified
</td>
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<th>OS</th>
<td>Unspecified
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>Normal
</td>
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<th>Priority</th>
<td>P2
</td>
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<th>Component</th>
<td>JavaScriptCore
</td>
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
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<th>Reporter</th>
<td>guybedford@gmail.com
</td>
</tr></table>
<p>
<div>
<pre>The following circular reference case should work as export default can be used with function declarations that are hoisted, according to the rules of the HoistableDeclaration lookahead (<a href="https://tc39.github.io/ecma262/#prod-HoistableDeclaration">https://tc39.github.io/ecma262/#prod-HoistableDeclaration</a>).
Instead, Safari gives the following error: SyntaxError: Importing binding name 'a' is not found.
a.js:
```
import b from './b.js';
b();
export default function a () {
console.log('a');
}
```
b.js:
```
import a from './a.js';
export default function b () {
a();
}
```
Where a `<script type="module" src="a.js"></script>` is included in the page.
This can be verified to work in the named exports hoisting case by converting the example to use `export function a ()`, `import {a}`, etc.</pre>
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