/**
 * @public
 * Iterate over `ArrayLike` calling a callback against it, the callback returns `ArrayLike` which is concatenated into a single `Array`.
 *
 * @param items - The items to iterate over.
 * @param mapCallback - The return from this callback is concatenated to the result, unless null is returned in which case the result is omitted.
 *
 * @returns The output of `mapCallback` flattened into a single array.
 *
 * @remarks
 * See {@link arrayFlatMap}.
 */
export declare function arrayFlatMap<TItem, TTransformed>(items: ArrayLike<TItem>, mapCallback: (item: TItem, index: number) => ArrayLike<TTransformed> | null): TTransformed[];
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