To trigger the script on clicking “Mark Shipped” on Item Fulfilment record

context.UserEventType

• APPROVE
• CANCEL
• CHANGEPASSWORD
• COPY
• CREATE
• DELETE
• DROPSHIP
• EDIT
• EDITFORECAST
• EMAIL
• MARKCOMPLETE
• ORDERITEMS
• PACK
• PAYBILLS
• PRINT
• QUICKVIEW
• REASSIGN
• REJECT
• SHIP
• SPECIALORDER
• TRANSFORM
• VIEW
• XEDIT

const afterSubmit = (scriptContext) => {
            try {
                let fulfillment = scriptContext.newRecord;
                let fulfillmentId = fulfillment.id;
                let shipStatus = fulfillment.getValue({ fieldId: 'shipstatus' });
                let asnSynced = fulfillment.getValue({ fieldId: 'custbody_jj_b2b_asn_synced' });
                if (scriptContext.type == 'ship' || (scriptContext.type == 'edit' && shipStatus == 'C' && !asnSynced)) {
                    let customerId = fulfillment.getValue({ fieldId: 'entity' });
                    if (!customerId) {
                        return;
                    }
                   //Remaining code;
                }
             } catch (mainErr) {
                log.error('Error @ afterSubmit', mainErr);
             }
        };