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/**
* <zh/> 数组去重
*
* <en/> deduplicate array
* @param arr - <zh/> 数组 | <en/> array
* @param by - <zh/> 通过某个属性去重 | <en/> deduplicate by some property
* @returns <zh/> 去重后的数组 | <en/> deduplicated array
*/
export declare function deduplicate<T>(arr: T[], by?: (item: T) => unknown): T[];