import { Boxed , unbox , ValidationErrors } from 'ngrx-forms' ; /**
 * A validation function that requires the value to be `true`. Considers `null` and
 * `undefined` as valid. Combine this function with the `required` validation
 * function if `null` or `undefined` should be considered invalid.
 *
 * The validation error returned by this validation function has the following shape:
 *
```typescript
{
  required: {
    actual: boolean;
  };
}
```
 *
 * Usually you would use this validation function in conjunction with the `validate`
 * update function to perform synchronous validation in your reducer:
 *
```typescript
updateGroup<MyFormValue>({
  agreeWithTermsOfService: validate(requiredTrue),
})
```
 *
 * Note that this function is generic to allow the compiler to properly infer the type
 * of the `validate` function for both optional and non-optional controls.
 */ export function requiredTrue < T extends boolean | Boxed < boolean > | null | undefined > ( value ) { value = unbox ( value ) as boolean | null | undefined as T ; if ( value === null || value === undefined ) { return { } ; } if ( value ) { return { } ; } return { required : { actual : value , } , } ; }