import { Accum } from "../_interfaces";
import { Observable } from "../Observable";
import { Property } from "../Property";
export declare const fold: CurriedFold;
export interface CurriedFold {
    <StateType, ValueType>(seed: StateType, acc: Accum<StateType, ValueType>, observable: Observable<ValueType>): Property<StateType>;
    <StateType>(seed: StateType): <ValueType>(acc: Accum<StateType, ValueType>, observable: Observable<ValueType>) => Property<StateType>;
    <StateType, ValueType>(seed: StateType, acc: Accum<StateType, ValueType>): (observable: Observable<ValueType>) => Property<StateType>;
    <StateType>(seed: StateType): <ValueType>(acc: Accum<StateType, ValueType>) => (observable: Observable<ValueType>) => Property<StateType>;
}