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object-group-bye

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ponyfill or polyfill of Object.groupBy ES feature

github.com/Vinsurs/object.groupby

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/** * Groups the elements of a given iterable according to the string values returned by a provided callback function. The returned object has separate properties for each group, containing arrays with the elements in the group * @param items An iterable (such as an Array) whose elements will be grouped * @param callbackFn A function to execute for each element in the iterable. It should return a value that can get coerced into a property key (string or symbol) indicating the group of the current element * @returns A null-prototype object with properties for all groups, each assigned to an array containing the elements of the associated group */ export declare function ObjectGroupBy<T = any>(items: Iterable<T>, callbackFn: (element: T, index: number) => any): Record<string | symbol, T[]>;