export interface IIteratorReduceReducerFunction<GOut, GReduced> {
    (previousValue: GReduced, currentValue: GOut, index: number): GReduced;
}
export interface IIteratorReduceFunction<GIn, GOut, GReturn> {
    (reducer: IIteratorReduceReducerFunction<GOut, GOut>): GOut;
    <GReduced>(reducer: IIteratorReduceReducerFunction<GOut, GReduced>, initialValue: GReduced): GReduced;
}