Function IsNull

IsNull(options?): PropertyDecorator
Checks if the given value is null.

Example
```
// Ensure the value is null (but not undefined).
@IsNull()
value: null
```
Parameters
- Optionaloptions: ValidationOptions
  Generic class-validator options.
Returns PropertyDecorator
- Defined in src/type/is-null/is-null.decorator.ts:22