Disable optional params at type level

[posva]

In Vue Router, params are reused by name whenever possible. This is why from a typing perspective, doing router.push({ name: 'route-name' }) for a route like { name: 'route-name', path: '/route/:id' } is valid and can work depending on where you are. This feature might disappear in major versions of Vue Router so I want to try out adding a type level restriction that is opt-in here.