[Webkit-unassigned] [Bug 153259] New: Web Inspector: Cannot expand "TypeError.prototype" to see its properties

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Tue Jan 19 16:58:46 PST 2016


            Bug ID: 153259
           Summary: Web Inspector: Cannot expand "TypeError.prototype" to
                    see its properties
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Inspector
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: joepeck at webkit.org
                CC: bburg at apple.com, graouts at webkit.org,
                    joepeck at webkit.org, mattbaker at apple.com,
                    nvasilyev at apple.com, timothy at apple.com,
                    webkit-bug-importer at group.apple.com

Cannot expand "TypeError.prototype" to see its properties.

1. js> TypeError.prototype
2. Try to expand the object
  => Uncaught Exception, empty UI

[Error] Uncaught exception in inspector page while dispatching callback for command Runtime.getProperties
TypeError: undefined is not an object (evaluating 'properties.stack.value')
(anonymous function) — ErrorObjectView.js:96
[native code]
(anonymous function) — RemoteObject.js:567

- Apparently the backend thinks that "TypeError.prototype" is an "error" object type.
- Seems like JSInjectedScriptHost::subtype (or WebInjectedScriptHost::subtype) might be returning a subtype even for the prototype. The frontend then treats this like a special Error object instance instead of a generic Object.

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