import { type WorkSpreadsheetTrendline } from './work-types';
export interface SpreadsheetTrendlinePoint {
    x: number;
    y: number;
}
export interface SpreadsheetTrendlineFit {
    points: SpreadsheetTrendlinePoint[];
    equation?: string;
    rSquared?: number;
}
export declare function fitSpreadsheetTrendline(xValues: readonly number[], yValues: readonly number[], source: WorkSpreadsheetTrendline): SpreadsheetTrendlineFit | null;