/**
 *
 * Copyright 2020-2026 Splunk Inc.
 *
 * 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
 *
 * https://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 { Attributes, Context, Link, SpanKind } from '@opentelemetry/api';
import { Sampler, SamplingResult } from '@opentelemetry/sdk-trace-web';
export interface SessionBasedSamplerConfig {
    /**
     * Sampler called when session isn't being sampled
     * default: AlwaysOffSampler
     */
    notSampled?: Sampler;
    /**
     * Ratio of sessions that get sampled (0.0 - 1.0, where 1 is all sessions)
     */
    ratio?: number;
    /**
     * Sampler called when session is being sampled
     * default: AlwaysOnSampler
     */
    sampled?: Sampler;
}
export declare class SessionBasedSampler implements Sampler {
    protected currentSessionId: string | undefined;
    protected currentSessionSampled: boolean | undefined;
    protected notSampled: Sampler;
    protected ratio: number;
    protected sampled: Sampler;
    protected upperBound: number;
    constructor({ notSampled, ratio, sampled, }?: SessionBasedSamplerConfig);
    isSessionSampled(sessionId: string): boolean;
    shouldSample(context: Context, traceId: string, spanName: string, spanKind: SpanKind, attributes: Attributes, links: Link[]): SamplingResult;
    toString(): string;
    private _accumulate;
    private _normalize;
}