Function mustExist

mustExist<TSubject>(subject: Maybe<TSubject>, errorMessage?: string): 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.
- OptionalerrorMessage: string
  An optional error message to throw when the subject is nil.
Returns TSubject
The subject, if it isn't nil.

Throws
UnexpectedNilError When the subject is nil.
- Defined in source/data/nil.ts:63