I am working with sheetjs , I amtrying to debug this problemto export to an exisiting sheetjs

This is the function

public exportInExcelFile(json: any[], excelFileName: string): void {
    const worksheet: XLSX.WorkSheet = XLSX.utils.sheet_add_json('test',json);

It shows me an erro in test string

Argument of type string is not assignable to parameter of type worksheet

Do anyone has an idea? Thanks in advance