[Webkit-unassigned] [Bug 42739] New: Web Inspector: should detect JS files/functions/lines which haven't been executed

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=42739

           Summary: Web Inspector: should detect JS files/functions/lines
                    which haven't been executed
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Enhancement
          Priority: P2
         Component: Web Inspector
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: ekamenskaya at chromium.org
                CC: timothy at apple.com, rik at webkit.org, keishi at webkit.org,
                    pmuellr at yahoo.com, joepeck at webkit.org,
                    pfeldman at chromium.org, yurys at chromium.org,
                    bweinstein at apple.com


In Scripts panel there should be button (or option in context menu, or keyboard shortcut) which allows to somehow highlight all functions or lines of code which haven’t been executed. 

Would be great if it worked not as in Page Speed (which shows all functions not executed on page onload), but as in JsCoverage http://siliconforks.com/jscoverage/ (which also makes measurement after page onload; for example, if you press a button on a page and some JS code is executed, it will be displayed as executed by the tool).

After unused functions/lines of javascript are shown, user can delete them using editing functionality in Scripts panel. 
This may be extremely useful when website contains huge js files, and you want to debug it. Typically by this way you can impressively reduce JS in size and make it more visible and clear for further debugging.

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