It seems that the Typescript plugin can't handle the new Typescript generic syntax.
var x : Array;
Gives a red square in Intellij 12.4.
But the code works.
And it seems as if the Typescript file watcher plugin only works on every second save.
BTW: I'm on MAC OS X 10.8.4
Original message URL: http://devnet.jetbrains.net/message/5494684#5494684