LoadOutput types incorrect

[madeleineostoja]

Describe the bug
From what I understand load should be able to return undefined in order to trigger a fallthrough to a 404 page. Currently that results in a type error because LoadOutput expects an object, which in my testing doesn't trigger a fallthrough, even if empty.

Logs
N/A

To Reproduce
Return nothing from a typed load function, inspect the type error given.

Expected behavior
load should be able to return undefined or null.