SheetJs XLSX.read is not a function

Question

So I'm trying to get all the headers from an excel (.xlsx) file using SheetJs. Here's my code:

import * as XLSX from "xlsx";

const readExcelHeaders=(file)=>{
    const fileReader = new FileReader()
    fileReader.readAsArrayBuffer(file)
    fileReader.onload=(e)=>{
        const bufferArray=e.target.result
        const wb=XLSX.read(bufferArray,{type:'buffer'})
        const wsname=wb.SheetNames[0]
        const ws=wb.Sheets[wsname]
        const data=XLSX.utils.sheet_to_json(ws)
    }
}

But I keep getting the error `"XLSX.read is not a function". If anyone can help me figure out why I would really appreciate it.