Function preventNullish

Results in "invalidity" for null and undefined. Otherwise results in "validity" for any value that satisfies the specified checker

preventNullish<T>(checker?, validationError?): ValidationCheckerFunction<undefined | null | T>
Type Parameters
- T
Parameters
- checker: ValidationChecker<T> = alwaysValid
- validationError: ValidationError = defaultValidationError
Returns ValidationCheckerFunction<undefined | null | T>