ValidatorFn is missing

[grosch]

In the previous version ValidatorFn had been exported so we could do this:

const notDefaultName = (): ValidatorFn<string, unknown> =>
    control => control.value?.trim() !== DetailSubSpaceComponent.defaultName

but in the new version it's not exported any longer. Was that on purpose?

[grosch-intl]

Can anyone provide help here?

[NetanelBasal]

@grosch @grosch-intl due to its complexity, we removed the support for typed validators. Import it from Angular.