declare namespace Twilio {
    class Response {
        appendHeader(key: string, value: string): void;
        setStatusCode(code: number): void;
        setBody(body: string): void;
    }
}
export interface Context {
    ACCOUNT_SID: string;
    AUTH_TOKEN: string;
    TWILIO_REGION?: string;
    API_KEY?: string;
    API_SECRET?: string;
}
export interface Event {
    Token: string;
    TokenResult?: object;
}
export interface ApiCredentials {
    Sid: string;
    Secret: string;
}
export declare type Callback = (error: any, response: Twilio.Response) => void;
export declare type HandlerFn = (context: Context, event: Event, callback: Callback) => void;
/**
 * Validates that the Token is valid
 *
 * @param token          the token to validate
 * @param accountSid     the accountSid
 * @param authToken      the authToken
 * @param apiCredentials optional api credentials to use instead of root account credentials
 */
export declare const validator: (token: string, accountSid: string, authToken?: string | undefined, realm?: string | undefined, apiCredentials?: ApiCredentials | undefined) => Promise<object>;
/**
 * A validator to be used with Twilio Function. It uses the {@link validator} to validate the token
 *
 * @param handlerFn    the Twilio Runtime Handler Function
 */
export declare const functionValidator: (handlerFn: HandlerFn) => HandlerFn;
export {};