ExplicitNullableTypeChecker (Fusion Endpoint 23.1.1 API)

java.lang.Object
- dev.hilla.ExplicitNullableTypeChecker

```
public class ExplicitNullableTypeChecker
extends Object
```
A checker for TypeScript null compatibility in Vaadin endpoint methods parameter and return types.

Constructor Summary

Constructors
Constructor Description

ExplicitNullableTypeChecker()

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`String`	`checkValueForAnnotatedElement(Object value, AnnotatedElement annotatedElement)`	Validates the given value for the given expected method return value type.
`static boolean`	`isRequired(AnnotatedElement element)`	Checks if the reflected element should be required (not nullable) in the generated Typescript code based on annotations.
`static boolean`	`isRequired(List<com.github.javaparser.ast.expr.AnnotationExpr> annotations)`	Checks if the parsed node should be required (not nullable) in the generated Typescript code based on the list of annotations.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - ExplicitNullableTypeChecker
```
public ExplicitNullableTypeChecker()
```
- Method Detail
  - isRequired
```
public static boolean isRequired(AnnotatedElement element)
```
    Checks if the reflected element should be required (not nullable) in the generated Typescript code based on annotations.
    
    Parameters:
    
    element - an element to be required
    
    Returns:
    
    a result of check
  - isRequired
```
public static boolean isRequired(List<com.github.javaparser.ast.expr.AnnotationExpr> annotations)
```
    Checks if the parsed node should be required (not nullable) in the generated Typescript code based on the list of annotations.
    
    Parameters:
    
    annotations - a list of node annotations to check
    
    Returns:
    
    a result of check
  - checkValueForAnnotatedElement
```
public String checkValueForAnnotatedElement(Object value,
                                            AnnotatedElement annotatedElement)
```
    Validates the given value for the given expected method return value type.
    
    Parameters:
    
    value - the value to validate
    
    annotatedElement - the entity to be type checked
    
    Returns:
    
    error message when the value is null while the expected type does not explicitly allow null, or null meaning the value is OK.