/**
 *              Copyright (c) 2025 Visa, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 **/
import { BooleanInput } from '@angular/cdk/coercion';
import { AfterContentInit, EventEmitter, QueryList } from '@angular/core';
import { ButtonDirective } from '../button/button.directive';
import * as i0 from "@angular/core";
export declare class AccordionHeadingDirective implements AfterContentInit {
    hostButton?: ButtonDirective | undefined;
    buttons: QueryList<ButtonDirective>;
    _subtle: import("@angular/core").WritableSignal<boolean>;
    _index: number;
    _buttonHeading: ButtonDirective;
    constructor(hostButton?: ButtonDirective | undefined);
    /**
     * Provides custom class&#40;es&#41; for custom styling.
     * @default .v-accordion-heading
     */
    get class(): string;
    set class(value: string);
    _class: string;
    get hostClass(): string;
    /**
     * Sets expanded state of accordion heading. <br />
     * <strong>This property is overriden when used with details/summary version of accordion. Instead, refer to the native <code>open</code> property of the details element.</strong>
     * @default false
     */
    get expanded(): boolean;
    set expanded(value: BooleanInput);
    _expanded: boolean;
    /**
     * Emits item index when accordion item is toggled (collapsed and expanded).
     */
    toggled: EventEmitter<number>;
    get hostBackground(): string | void;
    get hostGap(): string | void;
    get hostForeground(): string | void;
    ngAfterContentInit(): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<AccordionHeadingDirective, [{ optional: true; }]>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<AccordionHeadingDirective, "[v-accordion-heading]", never, { "class": { "alias": "class"; "required": false; }; "expanded": { "alias": "expanded"; "required": false; }; }, { "toggled": "toggled"; }, ["buttons"], never, true, never>;
}