import { User } from "@twilio/conversations";
import { Action, Dispatch } from "redux";
import { UserDescriptor } from "twilio-chat";
/**
 * A state of chat users value UserDescriptor from Twilio Chat SDK.
 *
 * @typedef {object} ChatState.ChatUserState
 * @property {UserDescriptor} sid User descriptor of the user by sid. See structure [here](https://media.twiliocdn.com/sdk/js/chat/releases/3.4.0/docs/UserDescriptor.html).
 * @memberof AppState
 */
export interface ChatUserState {
    [sid: string]: UserDescriptor;
}
export declare const ACTION_CACHE_USERS = "CHAT_CACHE_USERS";
interface ChatUserStateAction extends Action {
    readonly payload?: any;
}
export declare function reduce(state: ChatUserState, action: ChatUserStateAction): ChatUserState;
export declare class Actions {
    static get dispatcher(): Dispatch<any>;
    static dispatchCachedUsers(users: Array<User>): void;
    private static userDescriptorRequestCache;
    static fetchUser(identity: string): Promise<User | null>;
}
export {};