Eloquently sums up my feelings about the disadvantages of dynamic typing

[Michal Minich]

On Wednesday, 16 October 2013 at 17:27:54 UTC, H. S. Teoh wrote:

> some default error handler somewhere that swallows all JS errors

That would be function bound to window.onerror event. Remove it, 
or put breakpoint in it;

Also "use strict"; on new code. But it might be valuable to find 
out if it pays of putting it to use on old code (if it isn't too 
much warnings ->  refactoring needed). One benefit, among few 
others, is that assignment to undeclared variable throws 
exception.