/**
 * Copyright 2019, OpenCensus Authors
 *
 * 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 * as webTypes from '@opencensus/web-types';
export declare class NoopExporter implements webTypes.Exporter {
    publish(roots: webTypes.Span[]): Promise<number | string | void>;
    onStartSpan(root: webTypes.Span): void;
    onEndSpan(root: webTypes.Span): void;
}