export declare function exchangeAuthorizationCode(options: {
    tokenUrl: string;
    clientId: string;
    clientSecret: string;
    code: string;
    redirectUri: string;
    codeVerifier?: string;
    extraBody?: Record<string, string>;
    headers?: Record<string, string>;
}): Promise<string>;
export declare function appendPkceParams(params: URLSearchParams, context?: {
    codeChallenge?: string;
    codeChallengeMethod?: 'S256';
}): void;
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