Compiler option to force explicit access for global properties

[andrewvarga]

I've hurt myself multiple times with code like this:

var x = length / 2;

the problem is that I forgot to declare the "length" variable but because one exists as "window.length" this compiles without a problem.
A good help would be a stricter compiler option which would only allow accessing global properties like this:

window.length

[RyanCavanaugh]

This is already reasonably possible -- just delete all the globals you don't like from lib.d.ts (look around line 9800). Once we have #494 implemented, it will be straightforward to have a lib_noglobals.d.ts file that gives you the desired behavior.

[andrewvarga]

Ok, but if I delete such globals how will I see them when I do want to access them via "window.length" ? Won't that remove them completely ?

[RyanCavanaugh]

No. window.length is declared on line 3523 as a member of the Window interface.

[andrewvarga]

Got it. Indeed that solves it then, thanks!