import * as fs from 'fs'; import * as readline from 'readline'; function csvToJson(csvString: string, selectedColumns: string[] | null = null): any[] { const lines = csvString.split('\n'); const headers = lines[0].split(','); const jsonArr: any[] = []; for (let i = 1; i < lines.length; i++) { const currentLine = lines[i].trim(); if (!currentLine) { continue; } const values = currentLine.split(',')