/**
 * Minimal Twilio REST client (fetch-based, zero dependencies) — just the
 * outbound send a shuttle needs. Inbound arrives as a webhook (see message.ts).
 */
export interface TwilioApiOptions {
    readonly accountSid: string;
    readonly authToken: string;
    readonly fetch?: typeof fetch;
    /** Override for tests / regional endpoints. Default api.twilio.com. */
    readonly baseUrl?: string;
}
export declare class TwilioApi {
    private readonly base;
    private readonly auth;
    private readonly doFetch;
    constructor(opts: TwilioApiOptions);
    /** Send an SMS. Twilio segments long bodies automatically (≤1600 chars/request). */
    sendSms(from: string, to: string, body: string): Promise<{
        sid: string;
    }>;
}
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