TS2707 [ERROR]: Generic type 'RouterContext<R, P, S>' requires between 1 and 3 type arguments

[finlaydotb]

Upgrading from version 6.5.0 to 10.2.0 now give the following compile error:

TS2707 [ERROR]: Generic type 'RouterContext<R, P, S>' requires between 1 and 3 type arguments

so for example the following code does not compile anymore:

router.get("/", isAuthed, indexHandler)
router.get("/index", isAuthed, indexHandler)

export const indexHandler = async (ctx: RouterContext) => {
...
}

I could not find any thing in the documentation about what changes with RouterContext and how to use it now.