Make it possible to ignore predefined lines (consider them “covered”)

[mathiasbynens]

I have lots of projects that need to work in browsers but also in Node, Narwhal.js, Rhino, and other JavaScript environments. Example coverage report: http://rawgithub.com/mathiasbynens/esrever/master/coverage/esrever/esrever.js.html
The main code starts at line 20 and ends at line 41. Everything else is the export logic that covers all those environments.

Of course, since Istanbul uses Node to run the tests, the code paths for the other environments won’t be reached. But this is also causing the coverage % of the file to drop.

It would be nice if it was possible to somehow configure Istanbul to ignore some parts of the code and just consider them as covered, or just display them greyed out in the report (to signify that they were ignored while calculating the coverage % of the file). Thoughts?

[gotwarlost]

This issue is similar in many aspects to: #15 where some folks have chimed in on how this feature should behave. Let me think about this.

[mathiasbynens]

I see. Please feel free to close this issue in favor of #15.

[gotwarlost]

Closing since this is a dupe of #15