Cannot handle "in" operator within ternary statement?

[busticated]

Hey there -

First, thanks so much for your work on Uglify / Uglify2 - such a wonderful tool. I ran into an error which I was able to trace back to a specific line in a jQuery plugin we use over here:

https://github.com/mathiasbynens/jquery-visibility/blob/master/jquery-visibility.js#L7

Specifically this part :

eventName = 'onfocusin' in document && 'hasFocus' in document ? 'focusin focusout' : 'focus blur',

It seems Uglify & Uglify2 doesn't like "in" operators within a ternary statement?

You can repro it pretty easily using your online demo tool thinger here:

http://lisperator.net/uglifyjs/#demo

Just copy and paste the jquery.visibility plugin src in, run uglify, and then copy & paste the output into chrome's js console.

Error is:

Uncaught SyntaxError: Unexpected token in 

To fix it, I just re-wrote the line as an if statement.

Anyway, hope it helps!
-matt

[rvanvelzen]

This has to do with the code generator. Due to some transformations the while becomes a for, and the variable declarations are moved into it. However, the "in" expressions should be parenthesized in the code generator which they are not.

[busticated]

thanks guys!