import type { XlsxTransformerConcreteSheet, XlsxTransformerSheet, XlsxWriterAdapter } from './interfaces.js';
/**
 * Transforms data into an excel file using
 * a writer that can write to an excel file
 */
export declare class XlsxTransformer<T> {
    sheets: XlsxTransformerConcreteSheet<T, unknown>[];
    writer: XlsxWriterAdapter;
    sheetMap: Map<XlsxTransformerSheet<T, unknown>, symbol>;
    constructor(sheets: XlsxTransformerConcreteSheet<T, unknown>[], writer: XlsxWriterAdapter);
    init(): Promise<void>;
    process(data: T[]): Promise<void>;
}
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