Now what do you do if you have a library where you can't install types as we did it for load Ash for
example for a load Ash.
Thankfully we had such a types package and as I mentioned for most third party libraries you have that
but not necessarily for all or what if you have some other javascript code let's say in your index H
html file you have some other script code which execute stare where you set some global variable global.
This is set something like this where are you in the end.
No.
This will be a way lable globally as you know such variables added like this will be added to the global
Window object and you want to utilize them from inside your types code.
For example here if I want a console log global like this I get an error here in my idea and if I run
TSC dash W to start copulation I also get an error here so it doesn't like that global thing even though
we know that it will work because our next HMO file defines this global variable.
And since we have defer on this script this script will be executed after this script down day Iran.
In such cases you have no syntax a way lable in typescript and that is to declare command which you
can use.
You can declare certain variables for example to typescript you can say declare var global and tell
typescript that for example this will be a string or that this is anything.
This basically tells time don't worry it will exist it ever if we do is save this and I quit this compiler
and use Web pig instead.
We do see this output on our page because it's technically works and with declare war.
We also tell typescript that does exists.
Now I'm going to remove to stymie code here.
But being aware of declare off does keyword of this command is important.
It allows you to declare typescript features or variables where you know that they exist or let typescript
know about packages global variables in general which types who can't know but where you as a developer
know that they will be there.