Why is there no FormArrayDirective in @angular forms?

Question

according to the latest version of angular, @ angular / generates the export of the following things:

export {FormControlDirective} from './directives/reactive_directives/form_control_directive';
export {FormControlName} from './directives/reactive_directives/form_control_name';
export {FormGroupDirective} from './directives/reactive_directives/form_group_directive';
export {FormArrayName} from './directives/reactive_directives/form_group_name';
export {FormGroupName} from './directives/reactive_directives/form_group_name';

FormContolNameand FormControlDirective, FormGroupNameand FormGroupDirective, but FormArrayNamewithout FormArrayDirective, why?