| 1 | declare type OneByOneNext = (err?: Error) => Promise<any> | any;
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| 2 | declare type OneByOneCallback<T> = (item: T, next: OneByOneNext, index: number) => Promise<any> | any;
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| 3 | declare function oneByOne<T>(arr: ArrayLike<T>, callback: OneByOneCallback<T>): void;
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| 4 | export default oneByOne;
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