import type { FortuneConditionalFormatStyle } from './work-xlsx-conditional-format';
export declare class XlsxDifferentialFormatWriter {
    private readonly styles;
    private readonly container;
    changed: boolean;
    constructor(styles: Document);
    append(style: FortuneConditionalFormatStyle): number | null;
    serialize(): string;
    private updateCount;
}
export declare function writeXlsxConditionalFormats(worksheet: Document, source: unknown, differentialFormats?: XlsxDifferentialFormatWriter): void;