import { In, Out } from "../_interfaces";
export declare type Delta<ValueType, DeltaType> = (a: ValueType, b: ValueType) => DeltaType;
export declare const diff: CurriedDiff;
export interface CurriedDiff {
    <ObsType, ValueType, DeltaType>(f: Delta<ValueType, DeltaType>, start: ValueType, observable: In<ObsType, ValueType>): Out<ObsType, DeltaType>;
    <ValueType, DeltaType>(f: Delta<ValueType, DeltaType>): <ObsType>(start: ValueType, observable: In<ObsType, ValueType>) => Out<ObsType, DeltaType>;
    <ValueType, DeltaType>(f: Delta<ValueType, DeltaType>, start: ValueType): <ObsType>(observable: In<ObsType, ValueType>) => Out<ObsType, DeltaType>;
    <ValueType, DeltaType>(f: Delta<ValueType, DeltaType>): (start: ValueType) => <ObsType>(observable: In<ObsType, ValueType>) => Out<ObsType, DeltaType>;
}