import { type LaunchCenterProXCallback } from './shared';
/**
 * Speak payload definition.
 */
type Speak = LaunchCenterProXCallback & {
    /**
     * Text for Launch Center Pro to speak.
     */
    text?: string;
};
/**
 * Start a Launch Center Pro speak action.
 *
 * @param payload Speak payload.
 * @returns Launch Center Pro speak URL.
 * @example
 * speak({ text: 'Hello master!' })
 * // => 'launch://speak?text=Hello%20master!'
 * @example
 * speak({ text: 'Hello master!', xSuccess: '[action:15]' })
 * // => 'launch://x-callback-url/speak?text=Hello%20master!&x-success=%5Baction%3A15%5D'
 * @link https://help.contrast.co/hc/en-us/articles/203351237-2-3-Release-Notes
 */
export declare function speak(payload?: Speak): string;
export {};