import { HandlerInput } from 'ask-sdk-core';
/**
 * Possible modalities a user can use to respond to a request.
 */
export declare enum InputModality {
    /**
     * User touched the screen.
     */
    TOUCH = "touch",
    /**
     * User used their voice.
     */
    VOICE = "voice"
}
/**
 * Possible modalities with which the skill may respond to a request.
 */
export declare enum OutputModality {
    /**
     * Response is only displayed on the screen.
     */
    SCREEN = "screen",
    /**
     * Response is in the form of a voice prompt,
     * and may or may not include content displayed on the screen.
     */
    VOICE = "voice",
    /**
     * Response type is not yet known.
     */
    INDETERMINATE = "indeterminate"
}
/**
 * Describes the style in which a request should be responded to.
 * The most basic characteristic is what modality the response should have,
 * but this interface may be extended to describe additional characteristics
 * as desired (e.g. whispering).
 */
export interface ResponseStyle {
    /**
     * The modality with which a request should be responded to.
     */
    modality: OutputModality;
}
/**
 * A function that determines the input modality of a request.
 */
export declare type InputModalityEvaluator = (input: HandlerInput) => InputModality;
/**
 * A function that suggests the style in which a request should be responded to,
 * based on the content of the request and the history of how the user responded.
 */
export declare type ResponseStyleEvaluator = (input: HandlerInput, history: InputModality[]) => ResponseStyle;
/**
 * Default functions for determining input modality and response styles.
 */
export declare namespace ModalityEvaluationDefaults {
    /**
     * Default function for determining the input modality of a request.
     * This is best-effort and may not work in all cases.
     * @param input - Input for the current request
     * @returns InputModality - TOUCH if the request came from a TouchWrapper,
     * VOICE otherwise.
     */
    function defaultInputModalityEvaluator(input: HandlerInput): InputModality;
    /**
     * Default function for suggesting the style in which a request should be responded to.
     * @param input - Input for the current request
     * @param history - History of how the user responded to previous requests.
     * The current request is the last entry.
     * @returns ResponseStyle - SCREEN modality if the last InputModality was TOUCH, VOICE otherwise.
     */
    function defaultResponseStyleEvaluator(input: HandlerInput, history: InputModality[]): ResponseStyle;
    /**
     * Function that always returns an INDETERMINATE modality for a suggested ResponseStyle.
     * This is primarily used as the default override function for built-in controls, which results
     * in the controls deferring the decision to the function at the ControlManager level.
     * @returns OutputModality.INDETERMINATE
     */
    function indeterminateResponseStyleEvaluator(input: HandlerInput, history: InputModality[]): {
        modality: OutputModality;
    };
}
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