import { PipeTransform } from "@angular/core";
import { AbstractControl, FormGroup } from "@angular/forms";
import { Observable } from "rxjs";
import { AccordionState } from "../../types";
import * as i0 from "@angular/core";
export declare class WidgetEditorAccordionFormStatePipe implements PipeTransform {
    transform(form: FormGroup | AbstractControl | null): Observable<AccordionState>;
    static ɵfac: i0.ɵɵFactoryDeclaration<WidgetEditorAccordionFormStatePipe, never>;
    static ɵpipe: i0.ɵɵPipeDeclaration<WidgetEditorAccordionFormStatePipe, "nuiWidgetEditorAccordionFormState", false>;
}