01-Maintaining-State typescript error

[pufanalexandru]

I'm trying to run 01 example, but I'm getting an error at line 32:
.startWith({x: 100, y: 150})

The error says that

Argument of type '{x: number; y: number; }' is not assignable to parameter of type 'number | Scheduler'. Object literal may only specify known properties, and 'x' does not exist in type 'number | Scheduler'.

After checking startWith documentation, it seems that you can only pass numbers to it. Is there any workaround for this to work?