export interface TokenExchangerConfig {
    /** ULS token endpoint URL (e.g. https://oauth.my.tomtom.com/token) */
    tokenEndpoint: string;
    /** Client ID identifying this app to ULS */
    clientId: string;
    /** Target audience for the exchanged token (e.g. https://account.cx.tomtom.com) */
    audience: string;
    /** Scope requested for the exchanged token (e.g. authorize) */
    scope: string;
}
/**
 * Exchanges a user's access token for one scoped to a different audience
 * (e.g. the account management API) via the ULS token exchange endpoint.
 *
 * Uses RFC 8693 Token Exchange:
 * - grant_type: urn:ietf:params:oauth:grant-type:token-exchange
 * - subject_token_type: urn:ietf:params:oauth:token-type:jwt
 * - requested_token_type: urn:ietf:params:oauth:token-type:access_token
 */
export declare class TokenExchanger {
    private readonly tokenEndpoint;
    private readonly clientId;
    private readonly audience;
    private readonly scope;
    constructor(config: TokenExchangerConfig);
    exchangeToken(bearerToken: string): Promise<string | null>;
}
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