Function preventUndefined

preventUndefined<T>(
checker?: ValidationChecker<T>,
validationError?: ValidationError,
): ValidationCheckerFunction<undefined | T>
Results in "invalidity" for undefined. Otherwise results in "validity" for any value that satisfies the specified checker
Type Parameters
- T
Parameters
- checker: ValidationChecker<T> = alwaysValid
- validationError: ValidationError = defaultValidationError
Returns ValidationCheckerFunction<undefined | T>