import { Immutable } from './types/immutable';
interface StatefulServiceListener {
    (): void;
}
export declare abstract class StatefulService<S, IS = Immutable<S>> {
    private listeners;
    private _state;
    constructor(initialState?: S);
    private assertIsInitialized;
    /**
     * A getter for the internal state. It will return the same internal state
     * object (=== is true), but typed as recursively immutable.
     */
    get state(): IS;
    /**
     * Can be used to set state without triggering re-renders.
     * Should only be used in constructors this way.
     */
    protected set state(state: S | IS);
    protected setState(newState: S | Partial<S>): void;
    addListener(listener: StatefulServiceListener): void;
    removeListener(listener: StatefulServiceListener): void;
}
export {};