import { ArrayHelper } from "./array-helper.class";
declare class MatrixHelper extends ArrayHelper {
    firstOrEmpty<TItem = any>(input: ReadonlyArray<TItem[]>): TItem[];
    lastOrEmpty<TItem = any>(input: ReadonlyArray<TItem[]>): TItem[];
    flatten<TItem = any>(input: ReadonlyArray<ReadonlyArray<TItem>>): TItem[];
    mapAndFlatten<TInputItem, TResultItem>(input: ReadonlyArray<TInputItem>, mapperFn: (inputItem: TInputItem) => ReadonlyArray<TResultItem>): TResultItem[];
}
export { MatrixHelper };