export 'default' (imported as 'XLSX') was not found in 'xlsx' 에러 원인 import XLSX from 'xlsx'; // 중략... const handleFileUpload = (event) => { const file = event.target.files[0]; const reader = new FileReader(); reader.onload = (e) => { const data = new Uint8Array(e.target.result); const workbook = XLSX.read(data, { type: 'array' }); // 첫 번째 시트를 가져옴 const worksheet = workbook.Sheets[workbook.SheetN..