/**
 * 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 { SpanContext } from '@opencensus/web-types';
/**
 * Returns whether sampling hint bit of the intial load span context `options`
 * is set.
 */
export declare function isSampled(spanContext: SpanContext): boolean;
/**
 * Random sampling decision using `Math.random`.
 */
export declare function makeRandomSamplingDecision(sampleRate: number): number;