export interface IndexGeneratorFactory {
    (start?: number): IndexGenerator;
}
export interface IndexGenerator {
    next(): number;
    value(): number;
}
export interface IndexGeneratorDuckTypable {
    (val?: any): val is IndexGenerator;
}
export declare const isIndexGenerator: IndexGeneratorDuckTypable;
declare const newIndexGenerator: IndexGeneratorFactory;
export default newIndexGenerator;