From more of a search apparently you can use the sheets option to specify the sheets to load, but that seems to do nothing:
Neither:
const workbook = XLSX.read(arrayBuffer, { type: 'buffer', sheets: 0});
nor
const workbook = XLSX.read(arrayBuffer, { type: 'buffer', sheets: "Sheet1"});
seems to make a difference. On the smaller file it still loads all sheets and on the larger file it still times out after 60 seconds.
What are the libraries anyone else has used to read Excel Files in a Typescript Function?