import { Req, Sub } from "./services";
import { Subscription } from "./signal";
export declare const program: <State, Message>(options: Program.Options<State, Message>) => Program<State, Message>;
/** Internals */
export declare class Program<State, Message> {
    private readonly state$;
    private readonly message$;
    private readonly services;
    constructor(options: Program.Options<State, Message>);
    readonly state: State;
    update: (message: Message) => void;
    observe: (observer: (state: State) => void) => Subscription;
}
/** Types */
export declare namespace Program {
    interface Options<State, Message> {
        readonly env?: Record<string, any>;
        init(): Next<State>;
        update(state: State, message: Message): Next<State>;
        subscriptions?(state: State): ReadonlyArray<Sub<Message, any>>;
    }
}
export interface Next<State> {
    state: State;
    requests?: ReadonlyArray<Req<any, any>>;
}
export declare type Dispatch<Message = any> = (message: Message) => void;
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