Is there a way to restrict the generic type to only allow unions with a specific type (in this case: null)?
type Example<value_T extends Enforce_null_union>
Example<number | null> // Works
Example<string | null> // Works
Example<number> // Not allowed, must include `null`
Example<number> // Not allowed, must include `null`
Building upon Nadia's response, a potential solution based on the same concept can be found in this example (playground):
type Test<T extends (null extends T ? unknown : never)> = T
Here's a possible solution that may fit your scenario:
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