export interface PkcePair {
    codeVerifier: string;
    codeChallenge: string;
}
export declare function generatePkcePair(): PkcePair;
export declare function generateNonce(): string;
export interface LoopbackCallbackResult {
    code: string;
    state: string;
}
export interface LoopbackServer {
    port: number;
    redirectUri: string;
    waitForCallback(timeoutMs?: number): Promise<LoopbackCallbackResult>;
    close(): Promise<void>;
}
export declare function createLoopbackServer(expectedState: string, preferredPort?: number): Promise<LoopbackServer>;
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