export interface RefreshGrantParams {
    tokenEndpoint: string;
    refreshToken: string;
    clientId?: string | null;
    clientSecret?: string | null;
    tokenEndpointAuthMethod?: string | null;
    scopes?: string | null;
}
export interface RefreshGrantResult {
    accessToken: string;
    expiresInS?: number;
    refreshToken?: string;
}
export default function refreshAccessToken(params: RefreshGrantParams): Promise<RefreshGrantResult>;
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