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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 find<T, S extends T>(source: AsyncIterable<T>, predicate: (value: T, index: number) => value is S, thisArg?: any): Promise<S | undefined>; export declare function find<T>(source: AsyncIterable<T>, predicate: (value: T, index: number) => boolean | Promise<boolean>, thisArg?: any): Promise<T | undefined>;