Print format of the label. If empty, will use the default format set from the Shippo dashboard.
import { LabelFileTypeEnum } from "shippo/models/components";
let value: LabelFileTypeEnum = "PDF_4x6";
"PNG" | "PNG_2.3x7.5" | "PDF" | "PDF_2.3x7.5" | "PDF_4x6" | "PDF_4x8" | "PDF_A4" | "PDF_A5" | "PDF_A6" | "ZPLII"