import { WriteStream } from 'fs';
/**
 * Escapes special characters in a string for XML content
 * Converts &, <, >, ", and ' to their XML entity equivalents
 *
 * @param value - Value to escape
 * @returns Escaped string if input is string, otherwise returns original value
 *
 * @example
 * escapeXML('Hello < World') // returns 'Hello &lt; World'
 */
export declare function escapeXML(value: any): any;
/**
 * Converts a JavaScript Date to Excel serial number format
 * Excel uses days since December 30, 1899 as its internal date representation
 *
 * @param date - JavaScript Date object to convert
 * @returns Number of days since Excel epoch, with fractional part for time
 */
export declare function convertToExcelDate(date: Date): number;
/**
 * Formats a date as YYYY-MM-DD
 *
 * @param date - Date to format
 * @returns Date string in YYYY-MM-DD format
 *
 * @example
 * simpleDateFormat(new Date('2024-01-31')) // returns '2024-01-31'
 */
export declare function simpleDateFormat(date: Date): string;
/**
 * Type guard to check if a value is a valid Date object
 *
 * @param value - Value to check
 * @returns True if value is a Date instance
 */
export declare function isValidDate(value: any): value is Date;
/**
 * Creates a read stream that automatically deletes the file when finished
 * Useful for temporary file handling
 *
 * @param filePath - Path to the file to stream
 * @returns ReadStream that will delete the source file when complete
 */
export declare function destructiveStream(filePath: string): import("fs").ReadStream;
/**
 * Simple performance measurement utility
 *
 * @param label - Label to identify the performance measurement
 * @returns Object with end function to log elapsed time
 *
 * @example
 * const timer = perf('operation');
 * // ... do something ...
 * timer.end(); // logs: "operation: XXXms"
 */
export declare function perf(label: string): {
    end: () => void;
};
/** Function type for promised write operations */
export type PromisedWriter = (...content: string[]) => Promise<void>;
/**
 * Creates a promise-based writer function for a WriteStream
 * Allows for easier async/await usage of stream writes
 *
 * @param stream - WriteStream to wrap
 * @returns Promise-based write function
 *
 * @example
 * const writer = promiseWrite(writeStream);
 * await writer('content1', 'content2');
 */
export declare function promiseWrite(stream: WriteStream): PromisedWriter;
/**
 * Safely finishes a write stream
 * Returns a promise that resolves when the stream is fully closed
 *
 * @param stream - WriteStream to finish
 * @returns Promise that resolves when stream is finished
 */
export declare function finishStream(stream: WriteStream): Promise<void>;