[v3.0.0-beta.12] TS7031: Binding element 'index' implicitly has an 'any' type

[edesideri]

Hi,
in a new project running with v3.0.0-beta.12 vue3 and TS support i have the error in subject while try to run the virtualScroll example:

onVirtualScroll ({ index }) {
        virtualListIndex.value = index
      },

got this error while compiling: TS7031: Binding element 'index' implicitly has an 'any' type.
any suggestion?
thanks