[Webkit-unassigned] [Bug 244981] New: Can't find variable but only when Inspector is closed

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=244981

            Bug ID: 244981
           Summary: Can't find variable but only when Inspector is closed
           Product: WebKit
           Version: Safari 15
          Hardware: Mac (Intel)
                OS: macOS 12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: eryk.piast at gmail.com

Created attachment 462231

  --> https://bugs.webkit.org/attachment.cgi?id=462231&action=review

Video demonstrating how the error disappears after opening Inspector

The code below throws an error `ReferenceError: Can't find variable: methodFactory`. 

```
(() => {
    function methodFactory() {}

    class BrokenClass {
        classMethod = methodFactory((() => {}))
    }

    new BrokenClass();
})();
```

It happens only when the page loads normally, without the developer tools open. Once you open the inspector and refresh, the error disappears.
It's also impossible to reproduce the issue by pasting the code into the developer console.
The only way to see it is to load the page directly and observe the error after.

Here you can find an example, for convenience I've added an error handler so it prints out the message to HTML.
https://9wu2z2.sse.codesandbox.io

Tested on Safari 15.5 and 15.6.

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