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es-toolkit

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A state-of-the-art, high-performance JavaScript utility library with a small bundle size and strong type annotations.

es-toolkit.dev

toss/es-toolkit

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type ObjectIterator<T, R> = (value: T[keyof T], key: string, collection: T) => R; type ObjectIteratorTypeGuard<T, U extends T[keyof T]> = (value: T[keyof T], key: string, collection: T) => value is U; export type { ObjectIterator, ObjectIteratorTypeGuard };