import * as i0 from "@angular/core";
/**
 * Service to manage dropdown menu state
 * Used by dropdown menu components to communicate state to chevron
 */
export declare class DropdownMenuStateService {
    private readonly _isOpen;
    /**
     * Current open state of the dropdown menu
     */
    readonly isOpen: import("@angular/core").Signal<boolean>;
    /**
     * Set the open state
     */
    setOpen(open: boolean): void;
    /**
     * Toggle the open state
     */
    toggle(): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<DropdownMenuStateService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<DropdownMenuStateService>;
}