FieldJsonType:
| "esriFieldTypeBigInteger"
| "esriFieldTypeBlob"
| "esriFieldTypeDate"
| "esriFieldTypeDateOnly"
| "esriFieldTypeDouble"
| "esriFieldTypeGeometry"
| "esriFieldTypeGlobalID"
| "esriFieldTypeGUID"
| "esriFieldTypeInteger"
| "esriFieldTypeOID"
| "esriFieldTypeRaster"
| "esriFieldTypeSingle"
| "esriFieldTypeSmallInteger"
| "esriFieldTypeString"
| "esriFieldTypeTimeOnly"
| "esriFieldTypeTimestampOffset"
| "esriFieldTypeXML"
The type of the Field.