import { PipelinePolicy, PipelineRequest, SendRequest, PipelineResponse } from "@azure/core-rest-pipeline";
import { AuthenticationWWWAuthenticateRequest } from "@microsoft/teamsfx-api";
export declare class BearerChallengePolicy implements PipelinePolicy {
    private readonly getTokenForChallenge;
    readonly name = "BearerChallengePolicy";
    private readonly challengeRetryHeader;
    constructor(getTokenForChallenge: (scopes: AuthenticationWWWAuthenticateRequest) => Promise<string | undefined>);
    sendRequest(request: PipelineRequest, next: SendRequest): Promise<PipelineResponse>;
}
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