/**
 * Minimal Twilio REST API wrapper used by the Twilio channel.
 *
 * Requests use Twilio's normal `application/x-www-form-urlencoded`
 * body encoding and HTTP Basic auth. No Twilio SDK dependency is
 * required or exposed through eve public APIs.
 */
import { type TwilioAuthToken } from "#public/channels/twilio/verify.js";
/**
 * Builds the Twilio channel-local continuation token
 * (`<from>:<to>`). Route `send()` namespaces this with the channel
 * name before passing it to the runtime (`twilio:<from>:<to>`), so
 * Twilio routes should pass the raw channel-local form returned
 * here. `to` may be empty for proactive sessions that don't yet know
 * the Twilio sender number.
 */
export declare function twilioContinuationToken(from: string, to: string | undefined): string;
/** Twilio Account SID, materialized directly or from an async secret provider. */
export type TwilioAccountSid = string | (() => string | Promise<string>);
/** Fetch implementation override matching the global `fetch` signature. Defaults to the runtime global; supply a custom one for tests or non-standard runtimes. */
export type TwilioFetch = typeof fetch;
/** Credentials required for Twilio REST API calls and webhook verification. */
export interface TwilioCredentials {
    readonly accountSid?: TwilioAccountSid;
    readonly authToken?: TwilioAuthToken;
}
/** Shared Twilio REST API options. */
export interface TwilioApiOptions {
    readonly credentials?: TwilioCredentials;
    readonly apiBaseUrl?: string;
    readonly fetch?: TwilioFetch;
}
/**
 * Result of a Twilio REST call: HTTP `status`, an `ok` flag, and `body`.
 * `body` holds parsed JSON for a JSON response, the raw text string
 * otherwise, or `null` when empty.
 */
export interface TwilioApiResponse {
    readonly status: number;
    readonly ok: boolean;
    readonly body: unknown;
}
/** Parameters for creating an outbound Twilio message. */
export interface TwilioSendMessageInput extends TwilioApiOptions {
    readonly to: string;
    readonly body: string;
    readonly from?: string;
    readonly messagingServiceSid?: string;
    readonly statusCallbackUrl?: string;
}
/** Parameters for updating a live Twilio call with new TwiML. */
export interface TwilioUpdateCallInput extends TwilioApiOptions {
    readonly callSid: string;
    readonly twiml: string;
}
/** Resolves a Twilio Account SID, falling back to `TWILIO_ACCOUNT_SID`. */
export declare function resolveTwilioAccountSid(accountSid?: TwilioAccountSid): Promise<string>;
/**
 * Calls Twilio's REST API with Basic auth and form-encoded body fields.
 *
 * `path` is relative to `https://api.twilio.com` by default and may be
 * pointed elsewhere through `apiBaseUrl` for tests or proxies.
 */
export declare function callTwilioApi(input: {
    readonly credentials?: TwilioCredentials;
    readonly apiBaseUrl?: string;
    readonly fetch?: TwilioFetch;
    readonly path: string;
    readonly body: Readonly<Record<string, string | number | boolean | undefined | null>>;
}): Promise<TwilioApiResponse>;
/** Sends an outbound SMS/MMS-style message via Twilio's Messages resource. */
export declare function sendTwilioMessage(input: TwilioSendMessageInput): Promise<TwilioApiResponse>;
/** Updates a live Twilio call by posting replacement TwiML to the Calls resource. */
export declare function updateTwilioCall(input: TwilioUpdateCallInput): Promise<TwilioApiResponse>;