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/**
* @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
*/
import { OverlayReference } from '../overlay-reference';
/**
* Describes a strategy that will be used by an overlay to handle scroll events while it is open.
*/
export interface ScrollStrategy {
/** Enable this scroll strategy (called when the attached overlay is attached to a portal). */
enable: () => void;
/** Disable this scroll strategy (called when the attached overlay is detached from a portal). */
disable: () => void;
/** Attaches this `ScrollStrategy` to an overlay. */
attach: (overlayRef: OverlayReference) => void;
/** Detaches the scroll strategy from the current overlay. */
detach?: () => void;
}
/**
* Returns an error to be thrown when attempting to attach an already-attached scroll strategy.
*/
export declare function getMatScrollStrategyAlreadyAttachedError(): Error;