/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
/** @docs-private */
export declare type Constructor<T> = new (...args: any[]) => T;
/**
 * Interface for a mixin to provide a directive with a function that checks if the sticky input has
 * been changed since the last time the function was called. Essentially adds a dirty-check to the
 * sticky value.
 * @docs-private
 */
export interface CanStick {
    /** Whether sticky positioning should be applied. */
    sticky: boolean;
    /** Whether the sticky input has changed since it was last checked. */
    _hasStickyChanged: boolean;
    /** Whether the sticky value has changed since this was last called. */
    hasStickyChanged(): boolean;
    /** Resets the dirty check for cases where the sticky state has been used without checking. */
    resetStickyChanged(): void;
}
/** @docs-private */
export declare type CanStickCtor = Constructor<CanStick>;
/**
 * Mixin to provide a directive with a function that checks if the sticky input has been
 * changed since the last time the function was called. Essentially adds a dirty-check to the
 * sticky value.
 * @docs-private
 */
export declare function mixinHasStickyInput<T extends Constructor<{}>>(base: T): CanStickCtor & T;