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@reactivex/ix-esnext-esm

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The Interactive Extensions for JavaScript

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export declare function findIndex<T, S extends T>(source: Iterable<T>, predicate: (value: T, index: number) => value is S, thisArg?: any): number; export declare function findIndex<T>(source: Iterable<T>, predicate: (value: T, index: number) => boolean, thisArg?: any): number;