Setting Flash to demand type on variables

Being a code purist, I always set Flash to demand that I declare all variables/functions with a type. Like this:

var myVar1:int = 14; //Ok
var myVar2 = 18; //Compiler ERROR

My problem is that I just reinstalled my computer (including Flash) but I’ve forgotten where I do this setting. Anyone here with a better memory than me? :sigh: