/**
 * @module botbuilder
 */
/**
 * Copyright (c) Microsoft Corporation. All rights reserved.
 * Licensed under the MIT License.
 */
import { Activity } from 'botbuilder-core';
/**
 * Validates an [Activity](xref:botbuilder-core.Activity) and formats the timestamp fields.
 * @param activity [Activity](xref:botbuilder-core.Activity) to be validated.
 * @returns The [Activity](xref:botframework-schema.Activity).
 */
export declare function validateAndFixActivity(activity: Activity): Activity;
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