I can be partially helpful... You need to install the type definitions for this package and then TypeScript will know what you're talking about. I normally install them by doing npm install @types/
and then the name of the package. But this one isn't available there. Someone seems to have made it here:
http://codegists.com/snippet/typescript/bootstrap-tourdts_mpalmr_typescript
So you could steal that code and include it in your project manually.
It looks like it has a dependency on jquery, but then I managed to install the type definitions for jquery as well and it looks like everything works.
You'll also have to import the class you want:
import Tour = BootstrapTour.Tour;
There might be a better/more elegant way of doing this but that might start you in the right direction.