validateValueCallback return type should be optional

[BarkerCreations]

Are you requesting a feature, reporting a bug or asking a question?

Bug

What is the current behavior?

Typing in the survey-angular-ui package requires validateValueCallback to return a SurveyError or descendant.

What is the expected behavior?

If the value is valid I should be able to return null

How would you reproduce the current behavior (if this is a bug)?

Provide the test code and the tested page URL (if applicable)

Test code (in my custom widget)

const onValidateQuestion = (): SurveyError => {
    // Invalid if there is no answer object
    if (question.isRequired && (!question.value || Object.keys(question.value).length === 0)) {
        return new AnswerRequiredError();
    }

    // Yes I know
    // @ts-ignore
    return null;
};

Specify your

• browser:
• browser version:
• surveyjs platform (angular or react or jquery or knockout or vue): Angular
• surveyjs version: survey-angular-ui @ 1.11.12

[JaneSjs]

Hello @BarkerCreations, The survey.onValidateQuestion function doesn't actually expect any return value. If a value is invalid, please specify the options.error parameter to display a validation error message to a user.

Let me know what you think.