/**
 * Reducer for converting an array of objects to a map containing the same objects, where the key is
 * taken from a field in each object (e.g. `id`, `hash`, etc.).
 *
 * ```ts
 * const arr = [
 *   {id: 1, ...},
 *   {id: 2, ...},
 *   {id: 3, ...}
 * ]
 * const mapped = arr.reduce(arrayToMap('id'), {})
 * // mapped = {
 * //   1: {id: 1, ...},
 * //   2: {id: 2, ...},
 * //   3: {id: 3, ...},
 * // }
 * ```
 * @param keyField
 */
export declare const arrayToMap: (keyField: string) => <T extends Record<string, any>>(result: Record<string, T>, current: T) => Record<string, unknown>;
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