/// <reference types="node" />
/// <reference types="node" />
/**
 * Post-processor for Excel files to fix issues that ExcelJS doesn't handle properly
 * This includes:
 * 1. Array formulas (TRANSPOSE, FILTER, etc.)
 * 2. Defined names
 * 3. Border styles (future)
 */
export declare class ExcelPostProcessor {
    private zip;
    private definedNames;
    constructor();
    /**
     * Process an Excel buffer to fix known issues
     */
    processExcelBuffer(buffer: Buffer, univerData: any): Promise<Buffer>;
    /**
     * Fix array formulas by adding t="array" and ref attributes
     */
    private fixArrayFormulas;
    /**
     * Determine the spill range for an array formula
     */
    private determineSpillRange;
    /**
     * Add defined names to workbook.xml
     */
    private addDefinedNames;
    /**
     * Fix border styles (TODO: Implementation needed)
     */
    private fixBorderStyles;
    private columnToNumber;
    private numberToColumn;
}