iterator-helper/dist/types.d.ts

Provide helpers that polyfill all methods defined in [iterator helpers proposal](https://github.com/tc39/proposal-iterator-helpers), both for `Iterator` and `AsyncIterator`, and even more.

export declare const IteratorSlot: unique symbol;
export declare type Parameters<T, R> = T extends (...args: infer T) => R ? T : never;
export declare type IteratorOrIterable<T> = Iterable<T> | Iterator<T>;
export declare type AsyncIteratorOrIterable<T> = AsyncIterable<T> | AsyncIterator<T>;