import type { Cell } from '@fortune-sheet/core';
import { type XlsxSemanticColorOrigin } from './work-xlsx-cell-style-origin';
import { type XlsxColorResolver } from './work-xlsx-colors';
export declare const XLSX_GRADIENT_FILL_CELL_KEY: "a3sXlsxGradientFill";
export declare const MAX_XLSX_GRADIENT_STOPS = 256;
export interface XlsxGradientStop {
    color: string;
    colorOrigin?: XlsxSemanticColorOrigin;
    position: number;
}
export type XlsxGradientFill = {
    degree: number;
    stops: XlsxGradientStop[];
    type: 'linear';
} | {
    bottom: number;
    left: number;
    right: number;
    stops: XlsxGradientStop[];
    top: number;
    type: 'path';
};
export declare function readXlsxGradientFill(element: Element | undefined, colors: XlsxColorResolver): XlsxGradientFill | undefined;
export declare function withXlsxGradientFill(cell: Cell, fill: XlsxGradientFill | undefined): Cell;
export declare function deleteXlsxGradientFill(cell: Cell): void;
export declare function xlsxGradientFill(cell: Cell | null | undefined): XlsxGradientFill | undefined;
export declare function activeXlsxGradientFill(cell: Cell | null | undefined): XlsxGradientFill | undefined;
export declare function normalizeXlsxGradientFill(value: unknown): XlsxGradientFill | undefined;
export declare function xlsxGradientFillFallbackColor(fill: XlsxGradientFill): string;
export declare function xlsxGradientFillSemanticColors(fill: XlsxGradientFill | undefined): XlsxSemanticColorOrigin[];
export declare function xlsxGradientFillKey(fill: XlsxGradientFill | undefined): string;