import { ESLMixinElement } from '../../esl-mixin-element/core';
/**
 * ESLLineClampToggler mixin element
 * @author Feoktyst Shovchko
 *
 * ESLLineClampToggler is a custom attribute designed to work in pair with {@link ESLLineClamp}
 * Its purpose is provide toggle controls for switching between regular {@link ESLLineClamp} values and {@link ESLLineClampAlt} values.
 */
export declare class ESLLineClampToggler extends ESLMixinElement {
    static is: string;
    /** Custom event name to notify target about toggle */
    CLAMP_EVENT: string;
    /** Attribute to mark the target element as active */
    ALT_ACTIVE_ATTRIBUTE: string;
    /** Target selector for the element to control */
    target: string;
    /** Marker attribute to indicate active state */
    active: boolean;
    /** @returns the target element to control */
    get $target(): HTMLElement;
    protected get isTargetActive(): boolean;
    protected connectedCallback(): void;
    protected updateState(): void;
    protected initA11y(): void;
    /** Updates accessibility attributes based on the current state */
    updateA11y(): void;
    protected toggle(value?: boolean): void;
    protected onToggle(): void;
    protected onClampToggle(): void;
}