Function assertExists

assertExists<TSubject>(subject: Maybe<TSubject>): asserts subject is TSubject
Ensure that the passed subject is not nil; throw otherwise.
Type Parameters
- TSubject
  The type of the subject.
Parameters
- subject: Maybe<TSubject>
  A subject that is possibly nil.
Returns asserts subject is TSubject
Throws
UnexpectedNilError When the subject is nil.
- Defined in source/data/nil.ts:97