Neil McEwan commented
Typescript editor would be amazing, possibly embed option to use clearscript .net bridge to run output js scripts
Brendan Thompson commented
I use Watin + LINQPad to write test scripts for my data driven web pages. It is an awesome combination!
Dev Net commented
I use Linqpad a lot to store and run a lot of snippet programs. I have often wondered if you could... just could allow the simple html files to be displayed in the output pane. The ability to see mark up without red lines will make life a lot easier for a lot of us. [Integrating asp.net web server to run single page apps will be even cooler but I guess that would mean a lot of work]