refactor: Replace Class.extend with native class
diff --git a/erpnext/selling/sales_common.js b/erpnext/selling/sales_common.js
index 0428573..eb02867 100644
--- a/erpnext/selling/sales_common.js
+++ b/erpnext/selling/sales_common.js
@@ -9,15 +9,15 @@
 cur_frm.email_field = "contact_email";
 
 frappe.provide("erpnext.selling");
-erpnext.selling.SellingController = erpnext.TransactionController.extend({
-	setup: function() {
-		this._super();
+erpnext.selling.SellingController = class SellingController extends erpnext.TransactionController {
+	setup() {
+		super.setup();
 		this.frm.add_fetch("sales_partner", "commission_rate", "commission_rate");
 		this.frm.add_fetch("sales_person", "commission_rate", "commission_rate");
-	},
+	}
 
-	onload: function() {
-		this._super();
+	onload() {
+		super.onload();
 		this.setup_queries();
 		this.frm.set_query('shipping_rule', function() {
 			return {
@@ -26,9 +26,9 @@
 				}
 			};
 		});
-	},
+	}
 
-	setup_queries: function() {
+	setup_queries() {
 		var me = this;
 
 		$.each([["customer", "customer"],
@@ -81,10 +81,10 @@
 			});
 		}
 
-	},
+	}
 
-	refresh: function() {
-		this._super();
+	refresh() {
+		super.refresh();
 
 		frappe.dynamic_link = {doc: this.frm.doc, fieldname: 'customer', doctype: 'Customer'}
 
@@ -95,45 +95,45 @@
 			this.frm.toggle_display("packing_list", packing_list_exists ? true : false);
 		}
 		this.toggle_editable_price_list_rate();
-	},
+	}
 
-	customer: function() {
+	customer() {
 		var me = this;
 		erpnext.utils.get_party_details(this.frm, null, null, function() {
 			me.apply_price_list();
 		});
-	},
+	}
 
-	customer_address: function() {
+	customer_address() {
 		erpnext.utils.get_address_display(this.frm, "customer_address");
 		erpnext.utils.set_taxes_from_address(this.frm, "customer_address", "customer_address", "shipping_address_name");
-	},
+	}
 
-	shipping_address_name: function() {
+	shipping_address_name() {
 		erpnext.utils.get_address_display(this.frm, "shipping_address_name", "shipping_address");
 		erpnext.utils.set_taxes_from_address(this.frm, "shipping_address_name", "customer_address", "shipping_address_name");
-	},
+	}
 
-	sales_partner: function() {
+	sales_partner() {
 		this.apply_pricing_rule();
-	},
+	}
 
-	campaign: function() {
+	campaign() {
 		this.apply_pricing_rule();
-	},
+	}
 
-	selling_price_list: function() {
+	selling_price_list() {
 		this.apply_price_list();
 		this.set_dynamic_labels();
-	},
+	}
 
-	discount_percentage: function(doc, cdt, cdn) {
+	discount_percentage(doc, cdt, cdn) {
 		var item = frappe.get_doc(cdt, cdn);
 		item.discount_amount = 0.0;
 		this.apply_discount_on_item(doc, cdt, cdn, 'discount_percentage');
-	},
+	}
 
-	discount_amount: function(doc, cdt, cdn) {
+	discount_amount(doc, cdt, cdn) {
 
 		if(doc.name === cdn) {
 			return;
@@ -142,9 +142,9 @@
 		var item = frappe.get_doc(cdt, cdn);
 		item.discount_percentage = 0.0;
 		this.apply_discount_on_item(doc, cdt, cdn, 'discount_amount');
-	},
+	}
 
-	apply_discount_on_item: function(doc, cdt, cdn, field) {
+	apply_discount_on_item(doc, cdt, cdn, field) {
 		var item = frappe.get_doc(cdt, cdn);
 		if(!item.price_list_rate) {
 			item[field] = 0.0;
@@ -152,14 +152,14 @@
 			this.price_list_rate(doc, cdt, cdn);
 		}
 		this.set_gross_profit(item);
-	},
+	}
 
-	commission_rate: function() {
+	commission_rate() {
 		this.calculate_commission();
 		refresh_field("total_commission");
-	},
+	}
 
-	total_commission: function() {
+	total_commission() {
 		if(this.frm.doc.base_net_total) {
 			frappe.model.round_floats_in(this.frm.doc, ["base_net_total", "total_commission"]);
 
@@ -175,9 +175,9 @@
 			this.frm.set_value("commission_rate",
 				flt(this.frm.doc.total_commission * 100.0 / this.frm.doc.base_net_total));
 		}
-	},
+	}
 
-	allocated_percentage: function(doc, cdt, cdn) {
+	allocated_percentage(doc, cdt, cdn) {
 		var sales_person = frappe.get_doc(cdt, cdn);
 		if(sales_person.allocated_percentage) {
 
@@ -193,15 +193,15 @@
 			refresh_field(["allocated_percentage", "allocated_amount", "commission_rate","incentives"], sales_person.name,
 				sales_person.parentfield);
 		}
-	},
+	}
 
-	sales_person: function(doc, cdt, cdn) {
+	sales_person(doc, cdt, cdn) {
 		var row = frappe.get_doc(cdt, cdn);
 		this.calculate_incentive(row);
 		refresh_field("incentives",row.name,row.parentfield);
-	},
+	}
 
-	warehouse: function(doc, cdt, cdn) {
+	warehouse(doc, cdt, cdn) {
 		var me = this;
 		var item = frappe.get_doc(cdt, cdn);
 
@@ -239,18 +239,18 @@
 				});
 			}
 		})
-	},
+	}
 
-	toggle_editable_price_list_rate: function() {
+	toggle_editable_price_list_rate() {
 		var df = frappe.meta.get_docfield(this.frm.doc.doctype + " Item", "price_list_rate", this.frm.doc.name);
 		var editable_price_list_rate = cint(frappe.defaults.get_default("editable_price_list_rate"));
 
 		if(df && editable_price_list_rate) {
 			df.read_only = 0;
 		}
-	},
+	}
 
-	calculate_commission: function() {
+	calculate_commission() {
 		if(this.frm.fields_dict.commission_rate) {
 			if(this.frm.doc.commission_rate > 100) {
 				var msg = __(frappe.meta.get_label(this.frm.doc.doctype, "commission_rate", this.frm.doc.name)) +
@@ -262,9 +262,9 @@
 			this.frm.doc.total_commission = flt(this.frm.doc.base_net_total * this.frm.doc.commission_rate / 100.0,
 				precision("total_commission"));
 		}
-	},
+	}
 
-	calculate_contribution: function() {
+	calculate_contribution() {
 		var me = this;
 		$.each(this.frm.doc.doctype.sales_team || [], function(i, sales_person) {
 			frappe.model.round_floats_in(sales_person);
@@ -274,18 +274,18 @@
 					precision("allocated_amount", sales_person));
 			}
 		});
-	},
+	}
 
-	calculate_incentive: function(row) {
+	calculate_incentive(row) {
 		if(row.allocated_amount)
 		{
 			row.incentives = flt(
 					row.allocated_amount * row.commission_rate / 100.0,
 					precision("incentives", row));
 		}
-	},
+	}
 
-	batch_no: function(doc, cdt, cdn) {
+	batch_no(doc, cdt, cdn) {
 		var me = this;
 		var item = frappe.get_doc(cdt, cdn);
 
@@ -312,14 +312,14 @@
 				});
 			}
 		})
-	},
+	}
 
-	set_dynamic_labels: function() {
-		this._super();
+	set_dynamic_labels() {
+		super.set_dynamic_labels();
 		this.set_product_bundle_help(this.frm.doc);
-	},
+	}
 
-	set_product_bundle_help: function(doc) {
+	set_product_bundle_help(doc) {
 		if(!cur_frm.fields_dict.packing_list) return;
 		if ((doc.packed_items || []).length) {
 			$(cur_frm.fields_dict.packing_list.row.wrapper).toggle(true);
@@ -337,9 +337,9 @@
 			}
 		}
 		refresh_field('product_bundle_help');
-	},
+	}
 
-	company_address: function() {
+	company_address() {
 		var me = this;
 		if(this.frm.doc.company_address) {
 			frappe.call({
@@ -354,42 +354,42 @@
 		} else {
 			this.frm.set_value("company_address_display", "");
 		}
-	},
+	}
 
-	conversion_factor: function(doc, cdt, cdn, dont_fetch_price_list_rate) {
-	    this._super(doc, cdt, cdn, dont_fetch_price_list_rate);
+	conversion_factor(doc, cdt, cdn, dont_fetch_price_list_rate) {
+	    super.conversion_factor(doc, cdt, cdn, dont_fetch_price_list_rate);
 		if(frappe.meta.get_docfield(cdt, "stock_qty", cdn) &&
 			in_list(['Delivery Note', 'Sales Invoice'], doc.doctype)) {
 				if (doc.doctype === 'Sales Invoice' && (!doc.update_stock)) return;
 				this.set_batch_number(cdt, cdn);
 			}
-	},
+	}
 
-	batch_no: function(doc, cdt, cdn) {
-		this._super(doc, cdt, cdn);
-	},
+	batch_no(doc, cdt, cdn) {
+		super.batch_no(doc, cdt, cdn);
+	}
 
-	qty: function(doc, cdt, cdn) {
-		this._super(doc, cdt, cdn);
+	qty(doc, cdt, cdn) {
+		super.qty(doc, cdt, cdn);
 
 		if(in_list(['Delivery Note', 'Sales Invoice'], doc.doctype)) {
 			if (doc.doctype === 'Sales Invoice' && (!doc.update_stock)) return;
 			this.set_batch_number(cdt, cdn);
 		}
-	},
+	}
 
 	/* Determine appropriate batch number and set it in the form.
 	* @param {string} cdt - Document Doctype
 	* @param {string} cdn - Document name
 	*/
-	set_batch_number: function(cdt, cdn) {
+	set_batch_number(cdt, cdn) {
 		const doc = frappe.get_doc(cdt, cdn);
 		if (doc && doc.has_batch_no && doc.warehouse) {
 			this._set_batch_number(doc);
 		}
-	},
+	}
 
-	_set_batch_number: function(doc) {
+	_set_batch_number(doc) {
 		let args = {'item_code': doc.item_code, 'warehouse': doc.warehouse, 'qty': flt(doc.qty) * flt(doc.conversion_factor)};
 		if (doc.has_serial_no && doc.serial_no) {
 			args['serial_no'] = doc.serial_no
@@ -406,9 +406,9 @@
 				}
 			}
 		});
-	},
+	}
 
-	update_auto_repeat_reference: function(doc) {
+	update_auto_repeat_reference(doc) {
 		if (doc.auto_repeat) {
 			frappe.call({
 				method:"frappe.automation.doctype.auto_repeat.auto_repeat.update_reference",
@@ -426,7 +426,7 @@
 			})
 		}
 	}
-});
+};
 
 frappe.ui.form.on(cur_frm.doctype,"project", function(frm) {
 	if(in_list(["Delivery Note", "Sales Invoice"], frm.doc.doctype)) {