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@reactivex/ix-esnext-esm

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The Interactive Extensions for JavaScript

github.com/ReactiveX/IxJS

ReactiveX/IxJS

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export declare function toMap<TSource, TKey>(source: Iterable<TSource>, keySelector: (item: TSource) => TKey): Map<TKey, TSource>; export declare function toMap<TSource, TKey, TElement = TSource>(source: Iterable<TSource>, keySelector: (item: TSource) => TKey, elementSelector?: (item: TSource) => TElement): Map<TKey, TElement>;