import { Area, type IArea } from '../../treb-base-types/src/index';
import { Sheet } from './sheet';
/**
 * given a seed range (usually selection), expand in 4 directions to
 * find all non-blank cells. watch out for holes (maybe run twice?)
 *
 * actually I can see a couple of different ways to do this, useful
 * in different contexts. perhaps we'll add an option
 *
 */
export declare function ExpandRegion(seed: IArea, sheet: Sheet): Area;
/**
 * determine if the data has headers. we infer this if the first row or
 * column has a different data time or formatting type than the other rows/columns.
 * @param area
 */
export declare function HasHeaders(area: Area, sheet: Sheet): {
    row_headers: boolean;
    implied_row_headers: boolean;
    column_headers: boolean;
};
/**
 * find timeline for forecast analysis. must be numeric, monotonic (although
 * it can use date math) and we allow holes. should usually be leftmost or
 * closer to the left than the right.
 */
export declare function FindTrendTimeline(area: Area): Area | undefined;
/**
 * find values for forecast analysis. should be to the right of the timeline,
 * must be numeric, although there can be holes.
 */
export declare function FindTrendValues(area: Area, timeline?: Area): Area | undefined;