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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [Cocoa] Objective-C class whose name begins with an underscore can’t be exported to JavaScript"
href="https://bugs.webkit.org/show_bug.cgi?id=168578">168578</a>
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<th>Summary</th>
<td>[Cocoa] Objective-C class whose name begins with an underscore can’t be exported to JavaScript
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<th>Classification</th>
<td>Unclassified
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<th>Product</th>
<td>WebKit
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<th>Version</th>
<td>WebKit Local Build
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<th>Hardware</th>
<td>Unspecified
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<th>OS</th>
<td>Unspecified
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>Normal
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<th>Priority</th>
<td>P2
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<th>Component</th>
<td>JavaScriptCore
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
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<th>Reporter</th>
<td>mitz@webkit.org
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<th>CC</th>
<td>ggaren@apple.com
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<pre>When an Objective-C class’s name begins with an underscore, its conformance to JSExport is ignored. This is because -[JSWrapperMap classInfoForClass:] skips over classes whose names begin with an underscore. A comment in that method says that it skips “internal classes beginning with '_'” but offers no explanation why. A possible explanation is that this behavior does make instances of class clusters appear somewhat “nicer” when exported to JavaScript.
In framework code (including WebKit code), it is common for class names that aren’t part of the public API to being with an underscore, and such classes may have JS exports that they don’t share with a non-underscore-prefixed superclass.</pre>
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