export declare function firstWithIndex<T, R, N>(iterator: Iterator<T, R, N>, predicate: (value: T, index: number) => boolean): [T | undefined, number];
export declare function firstWithIndexAsync<T, R, N>(iterator: AsyncIterator<T, R, N>, predicate: (value: T, index: number) => boolean | Promise<boolean>): Promise<[T | undefined, number]>;
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