diff --git a/erpnext/accounts/doctype/journal_entry/journal_entry.js b/erpnext/accounts/doctype/journal_entry/journal_entry.js
index 37b03f3..2f8d3e3 100644
--- a/erpnext/accounts/doctype/journal_entry/journal_entry.js
+++ b/erpnext/accounts/doctype/journal_entry/journal_entry.js
@@ -194,19 +194,19 @@
 	refresh_field("accounts");
 }
 
-erpnext.accounts.JournalEntry = frappe.ui.form.Controller.extend({
-	onload: function() {
+erpnext.accounts.JournalEntry = class JournalEntry extends frappe.ui.form.Controller {
+	onload() {
 		this.load_defaults();
 		this.setup_queries();
 		this.setup_balance_formatter();
 		erpnext.accounts.dimensions.setup_dimension_filters(this.frm, this.frm.doctype);
-	},
+	}
 
-	onload_post_render: function() {
+	onload_post_render() {
 		cur_frm.get_field("accounts").grid.set_multiple_add("account");
-	},
+	}
 
-	load_defaults: function() {
+	load_defaults() {
 		//this.frm.show_print_first = true;
 		if(this.frm.doc.__islocal && this.frm.doc.company) {
 			frappe.model.set_default_values(this.frm.doc);
@@ -216,9 +216,9 @@
 			var posting_date = this.frm.doc.posting_date;
 			if(!this.frm.doc.amended_from) this.frm.set_value('posting_date', posting_date || frappe.datetime.get_today());
 		}
-	},
+	}
 
-	setup_queries: function() {
+	setup_queries() {
 		var me = this;
 
 		me.frm.set_query("account", "accounts", function(doc, cdt, cdn) {
@@ -324,9 +324,9 @@
 		});
 
 
-	},
+	}
 
-	setup_balance_formatter: function() {
+	setup_balance_formatter() {
 		var me = this;
 		$.each(["balance", "party_balance"], function(i, field) {
 			var df = frappe.meta.get_docfield("Journal Entry Account", field, me.frm.doc.name);
@@ -339,9 +339,9 @@
 					+ "</div>";
 			}
 		})
-	},
+	}
 
-	reference_name: function(doc, cdt, cdn) {
+	reference_name(doc, cdt, cdn) {
 		var d = frappe.get_doc(cdt, cdn);
 
 		if(d.reference_name) {
@@ -353,9 +353,9 @@
 				this.get_outstanding('Journal Entry', d.reference_name, doc.company, d);
 			}
 		}
-	},
+	}
 
-	get_outstanding: function(doctype, docname, company, child, due_date) {
+	get_outstanding(doctype, docname, company, child, due_date) {
 		var me = this;
 		var args = {
 			"doctype": doctype,
@@ -377,9 +377,9 @@
 				}
 			}
 		});
-	},
+	}
 
-	accounts_add: function(doc, cdt, cdn) {
+	accounts_add(doc, cdt, cdn) {
 		var row = frappe.get_doc(cdt, cdn);
 		$.each(doc.accounts, function(i, d) {
 			if(d.account && d.party && d.party_type) {
@@ -402,9 +402,9 @@
 		cur_frm.cscript.update_totals(doc);
 
 		erpnext.accounts.dimensions.copy_dimension_from_first_row(this.frm, cdt, cdn, 'accounts');
-	},
+	}
 
-});
+};
 
 cur_frm.script_manager.make(erpnext.accounts.JournalEntry);
 
diff --git a/erpnext/accounts/doctype/payment_reconciliation/payment_reconciliation.js b/erpnext/accounts/doctype/payment_reconciliation/payment_reconciliation.js
index 6b07197..dd91fec 100644
--- a/erpnext/accounts/doctype/payment_reconciliation/payment_reconciliation.js
+++ b/erpnext/accounts/doctype/payment_reconciliation/payment_reconciliation.js
@@ -34,8 +34,8 @@
 	}
 });
 
-erpnext.accounts.PaymentReconciliationController = frappe.ui.form.Controller.extend({
-	onload: function() {
+erpnext.accounts.PaymentReconciliationController = class PaymentReconciliationController extends frappe.ui.form.Controller {
+	onload() {
 		var me = this;
 
 		this.frm.set_query("party", function() {
@@ -84,18 +84,18 @@
 				frappe.throw({message: __("Please Select Both Company and Party Type First"), title: title});
 			}
 		};
-	},
+	}
 
-	refresh: function() {
+	refresh() {
 		this.frm.disable_save();
 		this.toggle_primary_action();
-	},
+	}
 
-	onload_post_render: function() {
+	onload_post_render() {
 		this.toggle_primary_action();
-	},
+	}
 
-	party: function() {
+	party() {
 		var me = this
 		if (!me.frm.doc.receivable_payable_account && me.frm.doc.party_type && me.frm.doc.party) {
 			return frappe.call({
@@ -112,9 +112,9 @@
 				}
 			});
 		}
-	},
+	}
 
-	get_unreconciled_entries: function() {
+	get_unreconciled_entries() {
 		var me = this;
 		return this.frm.call({
 			doc: me.frm.doc,
@@ -125,9 +125,9 @@
 			}
 		});
 
-	},
+	}
 
-	reconcile: function() {
+	reconcile() {
 		var me = this;
 		var show_dialog = me.frm.doc.payments.filter(d => d.difference_amount && !d.difference_account);
 
@@ -209,9 +209,9 @@
 		} else {
 			this.reconcile_payment_entries();
 		}
-	},
+	}
 
-	reconcile_payment_entries: function() {
+	reconcile_payment_entries() {
 		var me = this;
 
 		return this.frm.call({
@@ -222,9 +222,9 @@
 				me.toggle_primary_action();
 			}
 		});
-	},
+	}
 
-	set_invoice_options: function() {
+	set_invoice_options() {
 		var me = this;
 		var invoices = [];
 
@@ -243,9 +243,9 @@
 		}
 
 		refresh_field("payments");
-	},
+	}
 
-	toggle_primary_action: function() {
+	toggle_primary_action() {
 		if ((this.frm.doc.payments || []).length) {
 			this.frm.fields_dict.reconcile.$input
 				&& this.frm.fields_dict.reconcile.$input.addClass("btn-primary");
@@ -259,6 +259,6 @@
 		}
 	}
 
-});
+};
 
 $.extend(cur_frm.cscript, new erpnext.accounts.PaymentReconciliationController({frm: cur_frm}));
diff --git a/erpnext/accounts/doctype/pos_invoice/pos_invoice.js b/erpnext/accounts/doctype/pos_invoice/pos_invoice.js
index 493bd44..72d587a 100644
--- a/erpnext/accounts/doctype/pos_invoice/pos_invoice.js
+++ b/erpnext/accounts/doctype/pos_invoice/pos_invoice.js
@@ -4,18 +4,18 @@
 {% include 'erpnext/selling/sales_common.js' %};
 frappe.provide("erpnext.accounts");
 
-erpnext.selling.POSInvoiceController = erpnext.selling.SellingController.extend({
+erpnext.selling.POSInvoiceController = class POSInvoiceController extends erpnext.selling.SellingController {
 	setup(doc) {
 		this.setup_posting_date_time_check();
-		this._super(doc);
-	},
+		super.setup(doc);
+	}
 
-	company: function() {
+	company() {
 		erpnext.accounts.dimensions.update_dimension(this.frm, this.frm.doctype);
-	},
+	}
 
 	onload(doc) {
-		this._super();
+		super.onload();
 		this.frm.ignore_doctypes_on_cancel_all = ['POS Invoice Merge Log'];
 		if(doc.__islocal && doc.is_pos && frappe.get_route_str() !== 'point-of-sale') {
 			this.frm.script_manager.trigger("is_pos");
@@ -23,10 +23,10 @@
 		}
 
 		erpnext.accounts.dimensions.setup_dimension_filters(this.frm, this.frm.doctype);
-	},
+	}
 
 	refresh(doc) {
-		this._super();
+		super.refresh();
 		if (doc.docstatus == 1 && !doc.is_return) {
 			this.frm.add_custom_button(__('Return'), this.make_sales_return, __('Create'));
 			this.frm.page.set_inner_btn_group_as_primary(__('Create'));
@@ -36,13 +36,13 @@
 			this.frm.return_print_format = "Sales Invoice Return";
 			this.frm.set_value('consolidated_invoice', '');
 		}
-	},
+	}
 
-	is_pos: function() {
+	is_pos() {
 		this.set_pos_data();
-	},
+	}
 
-	set_pos_data: async function() {
+	async set_pos_data() {
 		if(this.frm.doc.is_pos) {
 			this.frm.set_value("allocate_advances_automatically", 0);
 			if(!this.frm.doc.company) {
@@ -69,7 +69,7 @@
 				}
 			}
 		}
-	},
+	}
 
 	customer() {
 		if (!this.frm.doc.customer) return
@@ -86,13 +86,13 @@
 			}, () => {
 				this.apply_pricing_rule();
 			});
-	},
+	}
 
-	amount: function(){
+	amount(){
 		this.write_off_outstanding_amount_automatically()
-	},
+	}
 
-	change_amount: function(){
+	change_amount(){
 		if(this.frm.doc.paid_amount > this.frm.doc.grand_total){
 			this.calculate_write_off_amount();
 		}else {
@@ -101,16 +101,16 @@
 		}
 
 		this.frm.refresh_fields();
-	},
+	}
 
-	loyalty_amount: function(){
+	loyalty_amount(){
 		this.calculate_outstanding_amount();
 		this.frm.refresh_field("outstanding_amount");
 		this.frm.refresh_field("paid_amount");
 		this.frm.refresh_field("base_paid_amount");
-	},
+	}
 
-	write_off_outstanding_amount_automatically: function() {
+	write_off_outstanding_amount_automatically() {
 		if(cint(this.frm.doc.write_off_outstanding_amount_automatically)) {
 			frappe.model.round_floats_in(this.frm.doc, ["grand_total", "paid_amount"]);
 			// this will make outstanding amount 0
@@ -125,15 +125,15 @@
 
 		this.calculate_outstanding_amount(false);
 		this.frm.refresh_fields();
-	},
+	}
 
-	make_sales_return: function() {
+	make_sales_return() {
 		frappe.model.open_mapped_doc({
 			method: "erpnext.accounts.doctype.pos_invoice.pos_invoice.make_sales_return",
 			frm: cur_frm
 		})
-	},
-})
+	}
+}
 
 $.extend(cur_frm.cscript, new erpnext.selling.POSInvoiceController({ frm: cur_frm }))
 
diff --git a/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.js b/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.js
index 06aa20b..b31cdce 100644
--- a/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.js
+++ b/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.js
@@ -4,10 +4,10 @@
 frappe.provide("erpnext.accounts");
 {% include 'erpnext/public/js/controllers/buying.js' %};
 
-erpnext.accounts.PurchaseInvoice = erpnext.buying.BuyingController.extend({
-	setup: function(doc) {
+erpnext.accounts.PurchaseInvoice = class PurchaseInvoice extends erpnext.buying.BuyingController {
+	setup(doc) {
 		this.setup_posting_date_time_check();
-		this._super(doc);
+		super.setup(doc);
 
 		// formatter for purchase invoice item
 		if(this.frm.doc.update_stock) {
@@ -25,14 +25,14 @@
 				}
 			};
 		});
-	},
+	}
 
-	company: function() {
+	company() {
 		erpnext.accounts.dimensions.update_dimension(this.frm, this.frm.doctype);
-	},
+	}
 
-	onload: function() {
-		this._super();
+	onload() {
+		super.onload();
 
 		if(!this.frm.doc.__islocal) {
 			// show credit_to in print format
@@ -48,11 +48,11 @@
 		}
 
 		erpnext.accounts.dimensions.setup_dimension_filters(this.frm, this.frm.doctype);
-	},
+	}
 
-	refresh: function(doc) {
+	refresh(doc) {
 		const me = this;
-		this._super();
+		super.refresh();
 
 		hide_fields(this.frm.doc);
 		// Show / Hide button
@@ -161,26 +161,26 @@
 		}
 
 		this.frm.set_df_property("tax_withholding_category", "hidden", doc.apply_tds ? 0 : 1);
-	},
+	}
 
-	unblock_invoice: function() {
+	unblock_invoice() {
 		const me = this;
 		frappe.call({
 			'method': 'erpnext.accounts.doctype.purchase_invoice.purchase_invoice.unblock_invoice',
 			'args': {'name': me.frm.doc.name},
 			'callback': (r) => me.frm.reload_doc()
 		});
-	},
+	}
 
-	block_invoice: function() {
+	block_invoice() {
 		this.make_comment_dialog_and_block_invoice();
-	},
+	}
 
-	change_release_date: function() {
+	change_release_date() {
 		this.make_dialog_and_set_release_date();
-	},
+	}
 
-	can_change_release_date: function(date) {
+	can_change_release_date(date) {
 		const diff = frappe.datetime.get_diff(date, frappe.datetime.nowdate());
 		if (diff < 0) {
 			frappe.throw(__('New release date should be in the future'));
@@ -188,9 +188,9 @@
 		} else {
 			return true;
 		}
-	},
+	}
 
-	make_comment_dialog_and_block_invoice: function(){
+	make_comment_dialog_and_block_invoice(){
 		const me = this;
 
 		const title = __('Block Invoice');
@@ -232,9 +232,9 @@
 		});
 
 		this.dialog.show();
-	},
+	}
 
-	make_dialog_and_set_release_date: function() {
+	make_dialog_and_set_release_date() {
 		const me = this;
 
 		const title = __('Set New Release Date');
@@ -263,17 +263,17 @@
 		});
 
 		this.dialog.show();
-	},
+	}
 
-	set_release_date: function(data) {
+	set_release_date(data) {
 		return frappe.call({
 			'method': 'erpnext.accounts.doctype.purchase_invoice.purchase_invoice.change_release_date',
 			'args': data,
 			'callback': (r) => this.frm.reload_doc()
 		});
-	},
+	}
 
-	supplier: function() {
+	supplier() {
 		var me = this;
 
 		// Do not update if inter company reference is there as the details will already be updated
@@ -295,9 +295,9 @@
 				me.frm.set_df_property("apply_tds", "read_only", me.frm.supplier_tds ? 0 : 1);
 				me.frm.set_df_property("tax_withholding_category", "hidden", me.frm.supplier_tds ? 0 : 1);
 			})
-	},
+	}
 
-	apply_tds: function(frm) {
+	apply_tds(frm) {
 		var me = this;
 
 		if (!me.frm.doc.apply_tds) {
@@ -307,9 +307,9 @@
 			me.frm.set_value("tax_withholding_category", me.frm.supplier_tds);
 			me.frm.set_df_property("tax_withholding_category", "hidden", 0);
 		}
-	},
+	}
 
-	credit_to: function() {
+	credit_to() {
 		var me = this;
 		if(this.frm.doc.credit_to) {
 			me.frm.call({
@@ -327,16 +327,16 @@
 				}
 			});
 		}
-	},
+	}
 
-	make_inter_company_invoice: function(frm) {
+	make_inter_company_invoice(frm) {
 		frappe.model.open_mapped_doc({
 			method: "erpnext.accounts.doctype.purchase_invoice.purchase_invoice.make_inter_company_sales_invoice",
 			frm: frm
 		});
-	},
+	}
 
-	is_paid: function() {
+	is_paid() {
 		hide_fields(this.frm.doc);
 		if(cint(this.frm.doc.is_paid)) {
 			this.frm.set_value("allocate_advances_automatically", 0);
@@ -347,44 +347,44 @@
 		}
 		this.calculate_outstanding_amount();
 		this.frm.refresh_fields();
-	},
+	}
 
-	write_off_amount: function() {
+	write_off_amount() {
 		this.set_in_company_currency(this.frm.doc, ["write_off_amount"]);
 		this.calculate_outstanding_amount();
 		this.frm.refresh_fields();
-	},
+	}
 
-	paid_amount: function() {
+	paid_amount() {
 		this.set_in_company_currency(this.frm.doc, ["paid_amount"]);
 		this.write_off_amount();
 		this.frm.refresh_fields();
-	},
+	}
 
-	allocated_amount: function() {
+	allocated_amount() {
 		this.calculate_total_advance();
 		this.frm.refresh_fields();
-	},
+	}
 
-	items_add: function(doc, cdt, cdn) {
+	items_add(doc, cdt, cdn) {
 		var row = frappe.get_doc(cdt, cdn);
 		this.frm.script_manager.copy_from_first_row("items", row,
 			["expense_account", "cost_center", "project"]);
-	},
+	}
 
-	on_submit: function() {
+	on_submit() {
 		$.each(this.frm.doc["items"] || [], function(i, row) {
 			if(row.purchase_receipt) frappe.model.clear_doc("Purchase Receipt", row.purchase_receipt)
 		})
-	},
+	}
 
-	make_debit_note: function() {
+	make_debit_note() {
 		frappe.model.open_mapped_doc({
 			method: "erpnext.accounts.doctype.purchase_invoice.purchase_invoice.make_debit_note",
 			frm: cur_frm
 		})
-	},
-});
+	}
+};
 
 cur_frm.script_manager.make(erpnext.accounts.PurchaseInvoice);
 
diff --git a/erpnext/accounts/doctype/sales_invoice/sales_invoice.js b/erpnext/accounts/doctype/sales_invoice/sales_invoice.js
index b361c0c..8e8f85a 100644
--- a/erpnext/accounts/doctype/sales_invoice/sales_invoice.js
+++ b/erpnext/accounts/doctype/sales_invoice/sales_invoice.js
@@ -2,23 +2,24 @@
 // License: GNU General Public License v3. See license.txt
 
 // print heading
+frappe.provide('cur_frm.pformat')
 cur_frm.pformat.print_heading = 'Invoice';
 
 {% include 'erpnext/selling/sales_common.js' %};
 frappe.provide("erpnext.accounts");
 
 
-erpnext.accounts.SalesInvoiceController = erpnext.selling.SellingController.extend({
-	setup: function(doc) {
+erpnext.accounts.SalesInvoiceController = class SalesInvoiceController extends erpnext.selling.SellingController {
+	setup(doc) {
 		this.setup_posting_date_time_check();
-		this._super(doc);
-	},
-	company: function() {
+		super.setup(doc);
+	}
+	company() {
 		erpnext.accounts.dimensions.update_dimension(this.frm, this.frm.doctype);
-	},
-	onload: function() {
+	}
+	onload() {
 		var me = this;
-		this._super();
+		super.onload();
 
 		this.frm.ignore_doctypes_on_cancel_all = ['POS Invoice'];
 		if(!this.frm.doc.__islocal && !this.frm.doc.customer && this.frm.doc.debit_to) {
@@ -38,11 +39,11 @@
 		}
 		erpnext.queries.setup_warehouse_query(this.frm);
 		erpnext.accounts.dimensions.setup_dimension_filters(this.frm, this.frm.doctype);
-	},
+	}
 
-	refresh: function(doc, dt, dn) {
+	refresh(doc, dt, dn) {
 		const me = this;
-		this._super();
+		super.refresh();
 		if(cur_frm.msgbox && cur_frm.msgbox.$wrapper.is(":visible")) {
 			// hide new msgbox
 			cur_frm.msgbox.hide();
@@ -141,16 +142,16 @@
 				}, __('Create'));
 			}
 		}
-	},
+	}
 
-	make_maintenance_schedule: function() {
+	make_maintenance_schedule() {
 		frappe.model.open_mapped_doc({
 			method: "erpnext.accounts.doctype.sales_invoice.sales_invoice.make_maintenance_schedule",
 			frm: cur_frm
 		})
-	},
+	}
 
-	on_submit: function(doc, dt, dn) {
+	on_submit(doc, dt, dn) {
 		var me = this;
 
 		if (frappe.get_route()[0] != 'Form') {
@@ -160,9 +161,9 @@
 		$.each(doc["items"], function(i, row) {
 			if(row.delivery_note) frappe.model.clear_doc("Delivery Note", row.delivery_note)
 		})
-	},
+	}
 
-	set_default_print_format: function() {
+	set_default_print_format() {
 		// set default print format to POS type or Credit Note
 		if(cur_frm.doc.is_pos) {
 			if(cur_frm.pos_print_format) {
@@ -183,9 +184,9 @@
 				cur_frm.meta._default_print_format = null;
 			}
 		}
-	},
+	}
 
-	sales_order_btn: function() {
+	sales_order_btn() {
 		var me = this;
 		this.$sales_order_btn = this.frm.add_custom_button(__('Sales Order'),
 			function() {
@@ -204,9 +205,9 @@
 					}
 				})
 			}, __("Get Items From"));
-	},
+	}
 
-	quotation_btn: function() {
+	quotation_btn() {
 		var me = this;
 		this.$quotation_btn = this.frm.add_custom_button(__('Quotation'),
 			function() {
@@ -228,9 +229,9 @@
 					}
 				})
 			}, __("Get Items From"));
-	},
+	}
 
-	delivery_note_btn: function() {
+	delivery_note_btn() {
 		var me = this;
 		this.$delivery_note_btn = this.frm.add_custom_button(__('Delivery Note'),
 			function() {
@@ -256,12 +257,12 @@
 					}
 				});
 			}, __("Get Items From"));
-	},
+	}
 
-	tc_name: function() {
+	tc_name() {
 		this.get_terms();
-	},
-	customer: function() {
+	}
+	customer() {
 		if (this.frm.doc.is_pos){
 			var pos_profile = this.frm.doc.pos_profile;
 		}
@@ -292,16 +293,16 @@
 				}
 			});
 		}
-	},
+	}
 
-	make_inter_company_invoice: function() {
+	make_inter_company_invoice() {
 		frappe.model.open_mapped_doc({
 			method: "erpnext.accounts.doctype.sales_invoice.sales_invoice.make_inter_company_purchase_invoice",
 			frm: me.frm
 		});
-	},
+	}
 
-	debit_to: function() {
+	debit_to() {
 		var me = this;
 		if(this.frm.doc.debit_to) {
 			me.frm.call({
@@ -319,14 +320,14 @@
 				}
 			});
 		}
-	},
+	}
 
-	allocated_amount: function() {
+	allocated_amount() {
 		this.calculate_total_advance();
 		this.frm.refresh_fields();
-	},
+	}
 
-	write_off_outstanding_amount_automatically: function() {
+	write_off_outstanding_amount_automatically() {
 		if(cint(this.frm.doc.write_off_outstanding_amount_automatically)) {
 			frappe.model.round_floats_in(this.frm.doc, ["grand_total", "paid_amount"]);
 			// this will make outstanding amount 0
@@ -341,39 +342,39 @@
 
 		this.calculate_outstanding_amount(false);
 		this.frm.refresh_fields();
-	},
+	}
 
-	write_off_amount: function() {
+	write_off_amount() {
 		this.set_in_company_currency(this.frm.doc, ["write_off_amount"]);
 		this.write_off_outstanding_amount_automatically();
-	},
+	}
 
-	items_add: function(doc, cdt, cdn) {
+	items_add(doc, cdt, cdn) {
 		var row = frappe.get_doc(cdt, cdn);
 		this.frm.script_manager.copy_from_first_row("items", row, ["income_account", "cost_center"]);
-	},
+	}
 
-	set_dynamic_labels: function() {
-		this._super();
+	set_dynamic_labels() {
+		super.set_dynamic_labels();
 		this.frm.events.hide_fields(this.frm)
-	},
+	}
 
-	items_on_form_rendered: function() {
+	items_on_form_rendered() {
 		erpnext.setup_serial_no();
-	},
+	}
 
-	packed_items_on_form_rendered: function(doc, grid_row) {
+	packed_items_on_form_rendered(doc, grid_row) {
 		erpnext.setup_serial_no();
-	},
+	}
 
-	make_sales_return: function() {
+	make_sales_return() {
 		frappe.model.open_mapped_doc({
 			method: "erpnext.accounts.doctype.sales_invoice.sales_invoice.make_sales_return",
 			frm: cur_frm
 		})
-	},
+	}
 
-	asset: function(frm, cdt, cdn) {
+	asset(frm, cdt, cdn) {
 		var row = locals[cdt][cdn];
 		if(row.asset) {
 			frappe.call({
@@ -387,18 +388,18 @@
 				}
 			})
 		}
-	},
+	}
 
-	is_pos: function(frm){
+	is_pos(frm){
 		this.set_pos_data();
-	},
+	}
 
-	pos_profile: function() {
+	pos_profile() {
 		this.frm.doc.taxes = []
 		this.set_pos_data();
-	},
+	}
 
-	set_pos_data: function() {
+	set_pos_data() {
 		if(this.frm.doc.is_pos) {
 			this.frm.set_value("allocate_advances_automatically", 0);
 			if(!this.frm.doc.company) {
@@ -428,13 +429,13 @@
 			}
 		}
 		else this.frm.trigger("refresh");
-	},
+	}
 
-	amount: function(){
+	amount(){
 		this.write_off_outstanding_amount_automatically()
-	},
+	}
 
-	change_amount: function(){
+	change_amount(){
 		if(this.frm.doc.paid_amount > this.frm.doc.grand_total){
 			this.calculate_write_off_amount();
 		}else {
@@ -443,15 +444,15 @@
 		}
 
 		this.frm.refresh_fields();
-	},
+	}
 
-	loyalty_amount: function(){
+	loyalty_amount(){
 		this.calculate_outstanding_amount();
 		this.frm.refresh_field("outstanding_amount");
 		this.frm.refresh_field("paid_amount");
 		this.frm.refresh_field("base_paid_amount");
 	}
-});
+};
 
 // for backward compatibility: combine new and previous states
 $.extend(cur_frm.cscript, new erpnext.accounts.SalesInvoiceController({frm: cur_frm}));
diff --git a/erpnext/buying/doctype/purchase_order/purchase_order.js b/erpnext/buying/doctype/purchase_order/purchase_order.js
index dd0f065..c0e19e9 100644
--- a/erpnext/buying/doctype/purchase_order/purchase_order.js
+++ b/erpnext/buying/doctype/purchase_order/purchase_order.js
@@ -61,8 +61,8 @@
 	}
 });
 
-erpnext.buying.PurchaseOrderController = erpnext.buying.BuyingController.extend({
-	setup: function() {
+erpnext.buying.PurchaseOrderController = class PurchaseOrderController extends erpnext.buying.BuyingController {
+	setup() {
 		this.frm.custom_make_buttons = {
 			'Purchase Receipt': 'Purchase Receipt',
 			'Purchase Invoice': 'Purchase Invoice',
@@ -70,13 +70,13 @@
 			'Payment Entry': 'Payment',
 		}
 
-		this._super();
+		super.setup();
 
-	},
+	}
 
-	refresh: function(doc, cdt, cdn) {
+	refresh(doc, cdt, cdn) {
 		var me = this;
-		this._super();
+		super.refresh();
 		var allow_receipt = false;
 		var is_drop_ship = false;
 
@@ -182,9 +182,9 @@
 		} else if(doc.docstatus===0) {
 			cur_frm.cscript.add_from_mappers();
 		}
-	},
+	}
 
-	get_items_from_open_material_requests: function() {
+	get_items_from_open_material_requests() {
 		erpnext.utils.map_current_doc({
 			method: "erpnext.stock.doctype.material_request.material_request.make_purchase_order_based_on_supplier",
 			args: {
@@ -202,17 +202,17 @@
 			},
 			get_query_method: "erpnext.stock.doctype.material_request.material_request.get_material_requests_based_on_supplier"
 		});
-	},
+	}
 
-	validate: function() {
+	validate() {
 		set_schedule_date(this.frm);
-	},
+	}
 
-	has_unsupplied_items: function() {
+	has_unsupplied_items() {
 		return this.frm.doc['supplied_items'].some(item => item.required_qty != item.supplied_qty)
-	},
+	}
 
-	make_stock_entry: function() {
+	make_stock_entry() {
 		var items = $.map(cur_frm.doc.items, function(d) { return d.bom ? d.item_code : false; });
 		var me = this;
 
@@ -326,9 +326,9 @@
 			me.dialog.hide();
 		});
 
-	},
+	}
 
-	_make_rm_stock_entry: function(rm_items) {
+	_make_rm_stock_entry(rm_items) {
 		frappe.call({
 			method:"erpnext.buying.doctype.purchase_order.purchase_order.make_rm_stock_entry",
 			args: {
@@ -341,31 +341,31 @@
 				frappe.set_route("Form", doclist[0].doctype, doclist[0].name);
 			}
 		});
-	},
+	}
 
-	make_inter_company_order: function(frm) {
+	make_inter_company_order(frm) {
 		frappe.model.open_mapped_doc({
 			method: "erpnext.buying.doctype.purchase_order.purchase_order.make_inter_company_sales_order",
 			frm: frm
 		});
-	},
+	}
 
-	make_purchase_receipt: function() {
+	make_purchase_receipt() {
 		frappe.model.open_mapped_doc({
 			method: "erpnext.buying.doctype.purchase_order.purchase_order.make_purchase_receipt",
 			frm: cur_frm,
 			freeze_message: __("Creating Purchase Receipt ...")
 		})
-	},
+	}
 
-	make_purchase_invoice: function() {
+	make_purchase_invoice() {
 		frappe.model.open_mapped_doc({
 			method: "erpnext.buying.doctype.purchase_order.purchase_order.make_purchase_invoice",
 			frm: cur_frm
 		})
-	},
+	}
 
-	add_from_mappers: function() {
+	add_from_mappers() {
 		var me = this;
 		this.frm.add_custom_button(__('Material Request'),
 			function() {
@@ -471,13 +471,13 @@
 				}
 			});
 		}, __("Tools"));
-	},
+	}
 
-	tc_name: function() {
+	tc_name() {
 		this.get_terms();
-	},
+	}
 
-	items_add: function(doc, cdt, cdn) {
+	items_add(doc, cdt, cdn) {
 		var row = frappe.get_doc(cdt, cdn);
 		if(doc.schedule_date) {
 			row.schedule_date = doc.schedule_date;
@@ -485,13 +485,13 @@
 		} else {
 			this.frm.script_manager.copy_from_first_row("items", row, ["schedule_date"]);
 		}
-	},
+	}
 
-	unhold_purchase_order: function(){
+	unhold_purchase_order(){
 		cur_frm.cscript.update_status("Resume", "Draft")
-	},
+	}
 
-	hold_purchase_order: function(){
+	hold_purchase_order(){
 		var me = this;
 		var d = new frappe.ui.Dialog({
 			title: __('Reason for Hold'),
@@ -523,28 +523,28 @@
 			}
 		});
 		d.show();
-	},
+	}
 
-	unclose_purchase_order: function(){
+	unclose_purchase_order(){
 		cur_frm.cscript.update_status('Re-open', 'Submitted')
-	},
+	}
 
-	close_purchase_order: function(){
+	close_purchase_order(){
 		cur_frm.cscript.update_status('Close', 'Closed')
-	},
+	}
 
-	delivered_by_supplier: function(){
+	delivered_by_supplier(){
 		cur_frm.cscript.update_status('Deliver', 'Delivered')
-	},
+	}
 
-	items_on_form_rendered: function() {
-		set_schedule_date(this.frm);
-	},
-
-	schedule_date: function() {
+	items_on_form_rendered() {
 		set_schedule_date(this.frm);
 	}
-});
+
+	schedule_date() {
+		set_schedule_date(this.frm);
+	}
+};
 
 // for backward compatibility: combine new and previous states
 $.extend(cur_frm.cscript, new erpnext.buying.PurchaseOrderController({frm: cur_frm}));
diff --git a/erpnext/buying/doctype/request_for_quotation/request_for_quotation.js b/erpnext/buying/doctype/request_for_quotation/request_for_quotation.js
index b76c378..ee0e1ef 100644
--- a/erpnext/buying/doctype/request_for_quotation/request_for_quotation.js
+++ b/erpnext/buying/doctype/request_for_quotation/request_for_quotation.js
@@ -205,10 +205,10 @@
 
 })
 
-erpnext.buying.RequestforQuotationController = erpnext.buying.BuyingController.extend({
-	refresh: function() {
+erpnext.buying.RequestforQuotationController = class RequestforQuotationController extends erpnext.buying.BuyingController {
+	refresh() {
 		var me = this;
-		this._super();
+		super.refresh();
 		if (this.frm.doc.docstatus===0) {
 			this.frm.add_custom_button(__('Material Request'),
 				function() {
@@ -302,17 +302,17 @@
 					me.get_suppliers_button(me.frm);
 				}, __("Tools"));
 		}
-	},
+	}
 
-	calculate_taxes_and_totals: function() {
+	calculate_taxes_and_totals() {
 		return;
-	},
+	}
 
-	tc_name: function() {
+	tc_name() {
 		this.get_terms();
-	},
+	}
 
-	get_suppliers_button: function (frm) {
+	get_suppliers_button (frm) {
 		var doc = frm.doc;
 		var dialog = new frappe.ui.Dialog({
 			title: __("Get Suppliers"),
@@ -410,8 +410,8 @@
 		});
 
 		dialog.show();
-	},
-});
+	}
+};
 
 // for backward compatibility: combine new and previous states
 $.extend(cur_frm.cscript, new erpnext.buying.RequestforQuotationController({frm: cur_frm}));
diff --git a/erpnext/buying/doctype/supplier_quotation/supplier_quotation.js b/erpnext/buying/doctype/supplier_quotation/supplier_quotation.js
index a0187b0..a3ba52e 100644
--- a/erpnext/buying/doctype/supplier_quotation/supplier_quotation.js
+++ b/erpnext/buying/doctype/supplier_quotation/supplier_quotation.js
@@ -4,19 +4,19 @@
 // attach required files
 {% include 'erpnext/public/js/controllers/buying.js' %};
 
-erpnext.buying.SupplierQuotationController = erpnext.buying.BuyingController.extend({
-	setup: function() {
+erpnext.buying.SupplierQuotationController = class SupplierQuotationController extends erpnext.buying.BuyingController {
+	setup() {
 		this.frm.custom_make_buttons = {
 			'Purchase Order': 'Purchase Order',
 			'Quotation': 'Quotation'
 		}
 
-		this._super();
-	},
+		super.setup();
+	}
 
-	refresh: function() {
+	refresh() {
 		var me = this;
-		this._super();
+		super.refresh();
 
 		if (this.frm.doc.__islocal && !this.frm.doc.valid_till) {
 			this.frm.set_value('valid_till', frappe.datetime.add_months(this.frm.doc.transaction_date, 1));
@@ -77,22 +77,22 @@
 				})
 			}, __("Get Items From"));
 		}
-	},
+	}
 
-	make_purchase_order: function() {
+	make_purchase_order() {
 		frappe.model.open_mapped_doc({
 			method: "erpnext.buying.doctype.supplier_quotation.supplier_quotation.make_purchase_order",
 			frm: cur_frm
 		})
-	},
-	make_quotation: function() {
+	}
+	make_quotation() {
 		frappe.model.open_mapped_doc({
 			method: "erpnext.buying.doctype.supplier_quotation.supplier_quotation.make_quotation",
 			frm: cur_frm
 		})
 
 	}
-});
+};
 
 // for backward compatibility: combine new and previous states
 $.extend(cur_frm.cscript, new erpnext.buying.SupplierQuotationController({frm: cur_frm}));
diff --git a/erpnext/crm/doctype/lead/lead.js b/erpnext/crm/doctype/lead/lead.js
index 0c88d28..8dfee1d 100644
--- a/erpnext/crm/doctype/lead/lead.js
+++ b/erpnext/crm/doctype/lead/lead.js
@@ -4,8 +4,8 @@
 frappe.provide("erpnext");
 cur_frm.email_field = "email_id";
 
-erpnext.LeadController = frappe.ui.form.Controller.extend({
-	setup: function () {
+erpnext.LeadController = class LeadController extends frappe.ui.form.Controller {
+	setup () {
 		this.frm.make_methods = {
 			'Customer': this.make_customer,
 			'Quotation': this.make_quotation,
@@ -13,9 +13,9 @@
 		};
 
 		this.frm.toggle_reqd("lead_name", !this.frm.doc.organization_lead);
-	},
+	}
 
-	onload: function () {
+	onload () {
 		this.frm.set_query("customer", function (doc, cdt, cdn) {
 			return { query: "erpnext.controllers.queries.customer_query" }
 		});
@@ -27,9 +27,9 @@
 		this.frm.set_query("contact_by", function (doc, cdt, cdn) {
 			return { query: "frappe.core.doctype.user.user.user_query" }
 		});
-	},
+	}
 
-	refresh: function () {
+	refresh () {
 		let doc = this.frm.doc;
 		erpnext.toggle_naming_series();
 		frappe.dynamic_link = { doc: doc, fieldname: 'name', doctype: 'Lead' }
@@ -45,47 +45,47 @@
 		} else {
 			frappe.contacts.clear_address_and_contact(this.frm);
 		}
-	},
+	}
 
-	make_customer: function () {
+	make_customer () {
 		frappe.model.open_mapped_doc({
 			method: "erpnext.crm.doctype.lead.lead.make_customer",
 			frm: cur_frm
 		})
-	},
+	}
 
-	make_opportunity: function () {
+	make_opportunity () {
 		frappe.model.open_mapped_doc({
 			method: "erpnext.crm.doctype.lead.lead.make_opportunity",
 			frm: cur_frm
 		})
-	},
+	}
 
-	make_quotation: function () {
+	make_quotation () {
 		frappe.model.open_mapped_doc({
 			method: "erpnext.crm.doctype.lead.lead.make_quotation",
 			frm: cur_frm
 		})
-	},
+	}
 
-	organization_lead: function () {
+	organization_lead () {
 		this.frm.toggle_reqd("lead_name", !this.frm.doc.organization_lead);
 		this.frm.toggle_reqd("company_name", this.frm.doc.organization_lead);
-	},
+	}
 
-	company_name: function () {
+	company_name () {
 		if (this.frm.doc.organization_lead && !this.frm.doc.lead_name) {
 			this.frm.set_value("lead_name", this.frm.doc.company_name);
 		}
-	},
+	}
 
-	contact_date: function () {
+	contact_date () {
 		if (this.frm.doc.contact_date) {
 			let d = moment(this.frm.doc.contact_date);
 			d.add(1, "day");
 			this.frm.set_value("ends_on", d.format(frappe.defaultDatetimeFormat));
 		}
 	}
-});
+};
 
 $.extend(cur_frm.cscript, new erpnext.LeadController({ frm: cur_frm }));
diff --git a/erpnext/crm/doctype/opportunity/opportunity.js b/erpnext/crm/doctype/opportunity/opportunity.js
index ac374a9..925c30b 100644
--- a/erpnext/crm/doctype/opportunity/opportunity.js
+++ b/erpnext/crm/doctype/opportunity/opportunity.js
@@ -145,8 +145,8 @@
 })
 
 // TODO commonify this code
-erpnext.crm.Opportunity = frappe.ui.form.Controller.extend({
-	onload: function() {
+erpnext.crm.Opportunity = class Opportunity extends frappe.ui.form.Controller {
+	onload() {
 
 		if(!this.frm.doc.status) {
 			frm.set_value('status', 'Open');
@@ -159,9 +159,9 @@
 		}
 
 		this.setup_queries();
-	},
+	}
 
-	setup_queries: function() {
+	setup_queries() {
 		var me = this;
 
 		if(this.frm.fields_dict.contact_by.df.options.match(/^User/)) {
@@ -185,15 +185,15 @@
 		else if (me.frm.doc.opportunity_from == "Customer") {
 			me.frm.set_query('party_name', erpnext.queries['customer']);
 		}
-	},
+	}
 
-	create_quotation: function() {
+	create_quotation() {
 		frappe.model.open_mapped_doc({
 			method: "erpnext.crm.doctype.opportunity.opportunity.make_quotation",
 			frm: cur_frm
 		})
 	}
-});
+};
 
 $.extend(cur_frm.cscript, new erpnext.crm.Opportunity({frm: cur_frm}));
 
diff --git a/erpnext/education/doctype/student_attendance_tool/student_attendance_tool.js b/erpnext/education/doctype/student_attendance_tool/student_attendance_tool.js
index b59d848..68e7780 100644
--- a/erpnext/education/doctype/student_attendance_tool/student_attendance_tool.js
+++ b/erpnext/education/doctype/student_attendance_tool/student_attendance_tool.js
@@ -72,8 +72,8 @@
 });
 
 
-education.StudentsEditor = Class.extend({
-	init: function(frm, wrapper, students) {
+education.StudentsEditor = class StudentsEditor {
+	constructor(frm, wrapper, students) {
 		this.wrapper = wrapper;
 		this.frm = frm;
 		if(students.length > 0) {
@@ -81,8 +81,8 @@
 		} else {
 			this.show_empty_state();
 		}
-	},
-	make: function(frm, students) {
+	}
+	make(frm, students) {
 		var me = this;
 
 		$(this.wrapper).empty();
@@ -173,13 +173,13 @@
 		});
 
 		$(htmls.join("")).appendTo(me.wrapper);
-	},
+	}
 
-	show_empty_state: function() {
+	show_empty_state() {
 		$(this.wrapper).html(
 			`<div class="text-center text-muted" style="line-height: 100px;">
 				${__("No Students in")} ${this.frm.doc.student_group}
 			</div>`
 		);
 	}
-});
+};
diff --git a/erpnext/healthcare/doctype/exercise_type/exercise_type.js b/erpnext/healthcare/doctype/exercise_type/exercise_type.js
index b49b00e..0614604 100644
--- a/erpnext/healthcare/doctype/exercise_type/exercise_type.js
+++ b/erpnext/healthcare/doctype/exercise_type/exercise_type.js
@@ -9,14 +9,14 @@
 	}
 });
 
-erpnext.ExerciseEditor = Class.extend({
-	init: function(frm, wrapper) {
+erpnext.ExerciseEditor = class ExerciseEditor {
+	constructor(frm, wrapper) {
 		this.wrapper = wrapper;
 		this.frm = frm;
 		this.make(frm, wrapper);
-	},
+	}
 
-	make: function(frm, wrapper) {
+	make(frm, wrapper) {
 		$(this.wrapper).empty();
 
 		this.exercise_toolbar = $('<p>\
@@ -38,9 +38,9 @@
 			this.make_cards(frm);
 			this.make_buttons(frm);
 		}
-	},
+	}
 
-	make_cards: function(frm) {
+	make_cards(frm) {
 		var me = this;
 		$(me.exercise_cards).empty();
 
@@ -60,9 +60,9 @@
 					</div>
 			</div>`, {image_src: step.image, title: step.title, description: step.description, col_id: "col-"+i, card_id: "card-"+i, id: i})).appendTo(me.row);
 		});
-	},
+	}
 
-	make_buttons: function(frm) {
+	make_buttons(frm) {
 		let me = this;
 		$('.btn-edit').on('click', function() {
 			let id = $(this).attr('data-id');
@@ -82,9 +82,9 @@
 				frm.dirty();
 			}, 300);
 		});
-	},
+	}
 
-	show_add_card_dialog: function(frm) {
+	show_add_card_dialog(frm) {
 		let me = this;
 		let d = new frappe.ui.Dialog({
 			title: __('Add Exercise Step'),
@@ -137,9 +137,9 @@
 			primary_action_label: __('Add')
 		});
 		d.show();
-	},
+	}
 
-	show_edit_card_dialog: function(frm, id) {
+	show_edit_card_dialog(frm, id) {
 		let new_dialog = new frappe.ui.Dialog({
 			title: __("Edit Exercise Step"),
 			fields: [
@@ -183,4 +183,4 @@
 		});
 		new_dialog.show();
 	}
-});
+};
diff --git a/erpnext/hr/doctype/employee/employee.js b/erpnext/hr/doctype/employee/employee.js
index c21d4b8..5639cc9 100755
--- a/erpnext/hr/doctype/employee/employee.js
+++ b/erpnext/hr/doctype/employee/employee.js
@@ -2,8 +2,8 @@
 // License: GNU General Public License v3. See license.txt
 
 frappe.provide("erpnext.hr");
-erpnext.hr.EmployeeController = frappe.ui.form.Controller.extend({
-	setup: function() {
+erpnext.hr.EmployeeController = class EmployeeController extends frappe.ui.form.Controller {
+	setup() {
 		this.frm.fields_dict.user_id.get_query = function(doc, cdt, cdn) {
 			return {
 				query: "frappe.core.doctype.user.user.user_query",
@@ -12,30 +12,30 @@
 		}
 		this.frm.fields_dict.reports_to.get_query = function(doc, cdt, cdn) {
 			return { query: "erpnext.controllers.queries.employee_query"} }
-	},
+	}
 
-	refresh: function() {
+	refresh() {
 		var me = this;
 		erpnext.toggle_naming_series();
-	},
+	}
 
-	date_of_birth: function() {
+	date_of_birth() {
 		return cur_frm.call({
 			method: "get_retirement_date",
 			args: {date_of_birth: this.frm.doc.date_of_birth}
 		});
-	},
+	}
 
-	salutation: function() {
+	salutation() {
 		if(this.frm.doc.salutation) {
 			this.frm.set_value("gender", {
 				"Mr": "Male",
 				"Ms": "Female"
 			}[this.frm.doc.salutation]);
 		}
-	},
+	}
 
-});
+};
 frappe.ui.form.on('Employee',{
 	setup: function(frm) {
 		frm.set_query("leave_policy", function() {
diff --git a/erpnext/hr/doctype/employee_attendance_tool/employee_attendance_tool.js b/erpnext/hr/doctype/employee_attendance_tool/employee_attendance_tool.js
index 3205a92..ab965d5 100644
--- a/erpnext/hr/doctype/employee_attendance_tool/employee_attendance_tool.js
+++ b/erpnext/hr/doctype/employee_attendance_tool/employee_attendance_tool.js
@@ -68,13 +68,13 @@
 	}
 }
 
-erpnext.MarkedEmployee = Class.extend({
-	init: function(frm, wrapper, employee) {
+erpnext.MarkedEmployee = class MarkedEmployee {
+	constructor(frm, wrapper, employee) {
 		this.wrapper = wrapper;
 		this.frm = frm;
 		this.make(frm, employee);
-	},
-	make: function(frm, employee) {
+	}
+	make(frm, employee) {
 		var me = this;
 		$(this.wrapper).empty();
 
@@ -104,16 +104,16 @@
 				})).appendTo(row);
 		});
 	}
-});
+};
 
 
-erpnext.EmployeeSelector = Class.extend({
-	init: function(frm, wrapper, employee) {
+erpnext.EmployeeSelector = class EmployeeSelector {
+	constructor(frm, wrapper, employee) {
 		this.wrapper = wrapper;
 		this.frm = frm;
 		this.make(frm, employee);
-	},
-	make: function(frm, employee) {
+	}
+	make(frm, employee) {
 		var me = this;
 
 		$(this.wrapper).empty();
@@ -266,6 +266,6 @@
 
 		mark_employee_toolbar.appendTo($(this.wrapper));
 	}
-});
+};
 
 
diff --git a/erpnext/hr/doctype/upload_attendance/upload_attendance.js b/erpnext/hr/doctype/upload_attendance/upload_attendance.js
index 29aa854..bbafc82 100644
--- a/erpnext/hr/doctype/upload_attendance/upload_attendance.js
+++ b/erpnext/hr/doctype/upload_attendance/upload_attendance.js
@@ -5,19 +5,19 @@
 
 frappe.provide("erpnext.hr");
 
-erpnext.hr.AttendanceControlPanel = frappe.ui.form.Controller.extend({
-	onload: function() {
+erpnext.hr.AttendanceControlPanel = class AttendanceControlPanel extends frappe.ui.form.Controller {
+	onload() {
 		this.frm.set_value("att_fr_date", frappe.datetime.get_today());
 		this.frm.set_value("att_to_date", frappe.datetime.get_today());
-	},
+	}
 
-	refresh: function() {
+	refresh() {
 		this.frm.disable_save();
 		this.show_upload();
 		this.setup_import_progress();
-	},
+	}
 
-	get_template:function() {
+	get_template() {
 		if(!this.frm.doc.att_fr_date || !this.frm.doc.att_to_date) {
 			frappe.msgprint(__("Attendance From Date and Attendance To Date is mandatory"));
 			return;
@@ -28,7 +28,7 @@
 			from_date: this.frm.doc.att_fr_date,
 			to_date: this.frm.doc.att_to_date,
 		});
-	},
+	}
 
 	show_upload() {
 		var $wrapper = $(cur_frm.fields_dict.upload_html.wrapper).empty();
@@ -36,7 +36,7 @@
 			wrapper: $wrapper,
 			method: 'erpnext.hr.doctype.upload_attendance.upload_attendance.upload'
 		});
-	},
+	}
 
 	setup_import_progress() {
 		var $log_wrapper = $(this.frm.fields_dict.import_log.wrapper).empty();
@@ -64,6 +64,6 @@
 			}
 		});
 	}
-})
+}
 
 cur_frm.cscript = new erpnext.hr.AttendanceControlPanel({frm: cur_frm});
diff --git a/erpnext/maintenance/doctype/maintenance_schedule/maintenance_schedule.js b/erpnext/maintenance/doctype/maintenance_schedule/maintenance_schedule.js
index ddbcdfd..2adfaf4 100644
--- a/erpnext/maintenance/doctype/maintenance_schedule/maintenance_schedule.js
+++ b/erpnext/maintenance/doctype/maintenance_schedule/maintenance_schedule.js
@@ -45,8 +45,8 @@
 })
 
 // TODO commonify this code
-erpnext.maintenance.MaintenanceSchedule = frappe.ui.form.Controller.extend({
-	refresh: function() {
+erpnext.maintenance.MaintenanceSchedule = class MaintenanceSchedule extends frappe.ui.form.Controller {
+	refresh() {
 		frappe.dynamic_link = {doc: this.frm.doc, fieldname: 'customer', doctype: 'Customer'}
 
 		var me = this;
@@ -76,21 +76,21 @@
 				});
 			}, __('Create'));
 		}
-	},
+	}
 
-	start_date: function(doc, cdt, cdn) {
+	start_date(doc, cdt, cdn) {
 		this.set_no_of_visits(doc, cdt, cdn);
-	},
+	}
 
-	end_date: function(doc, cdt, cdn) {
+	end_date(doc, cdt, cdn) {
 		this.set_no_of_visits(doc, cdt, cdn);
-	},
+	}
 
-	periodicity: function(doc, cdt, cdn) {
+	periodicity(doc, cdt, cdn) {
 		this.set_no_of_visits(doc, cdt, cdn);
-	},
+	}
 
-	set_no_of_visits: function(doc, cdt, cdn) {
+	set_no_of_visits(doc, cdt, cdn) {
 		var item = frappe.get_doc(cdt, cdn);
 
 		if (item.start_date && item.end_date && item.periodicity) {
@@ -112,8 +112,8 @@
 			var no_of_visits = cint(date_diff / days_in_period[item.periodicity]);
 			frappe.model.set_value(item.doctype, item.name, "no_of_visits", no_of_visits);
 		}
-	},
-});
+	}
+};
 
 $.extend(cur_frm.cscript, new erpnext.maintenance.MaintenanceSchedule({frm: cur_frm}));
 
diff --git a/erpnext/maintenance/doctype/maintenance_visit/maintenance_visit.js b/erpnext/maintenance/doctype/maintenance_visit/maintenance_visit.js
index 4cbb02a..12dc59c 100644
--- a/erpnext/maintenance/doctype/maintenance_visit/maintenance_visit.js
+++ b/erpnext/maintenance/doctype/maintenance_visit/maintenance_visit.js
@@ -41,8 +41,8 @@
 })
 
 // TODO commonify this code
-erpnext.maintenance.MaintenanceVisit = frappe.ui.form.Controller.extend({
-	refresh: function() {
+erpnext.maintenance.MaintenanceVisit = class MaintenanceVisit extends frappe.ui.form.Controller {
+	refresh() {
 		frappe.dynamic_link = {doc: this.frm.doc, fieldname: 'customer', doctype: 'Customer'}
 
 		var me = this;
@@ -96,7 +96,7 @@
 					})
 				}, __("Get Items From"));
 		}
-	},
-});
+	}
+};
 
-$.extend(cur_frm.cscript, new erpnext.maintenance.MaintenanceVisit({frm: cur_frm}));
\ No newline at end of file
+$.extend(cur_frm.cscript, new erpnext.maintenance.MaintenanceVisit({frm: cur_frm}));
diff --git a/erpnext/manufacturing/doctype/bom/bom.js b/erpnext/manufacturing/doctype/bom/bom.js
index fbfd801..2b32944 100644
--- a/erpnext/manufacturing/doctype/bom/bom.js
+++ b/erpnext/manufacturing/doctype/bom/bom.js
@@ -357,16 +357,16 @@
 	}
 });
 
-erpnext.bom.BomController = erpnext.TransactionController.extend({
-	conversion_rate: function(doc) {
+erpnext.bom.BomController = class BomController extends erpnext.TransactionController {
+	conversion_rate(doc) {
 		if(this.frm.doc.currency === this.get_company_currency()) {
 			this.frm.set_value("conversion_rate", 1.0);
 		} else {
 			erpnext.bom.update_cost(doc);
 		}
-	},
+	}
 
-	item_code: function(doc, cdt, cdn){
+	item_code(doc, cdt, cdn){
 		var scrap_items = false;
 		var child = locals[cdt][cdn];
 		if (child.doctype == 'BOM Scrap Item') {
@@ -378,19 +378,19 @@
 		}
 
 		get_bom_material_detail(doc, cdt, cdn, scrap_items);
-	},
+	}
 
-	buying_price_list: function(doc) {
+	buying_price_list(doc) {
 		this.apply_price_list();
-	},
+	}
 
-	plc_conversion_rate: function(doc) {
+	plc_conversion_rate(doc) {
 		if (!this.in_apply_price_list) {
 			this.apply_price_list(null, true);
 		}
-	},
+	}
 
-	conversion_factor: function(doc, cdt, cdn) {
+	conversion_factor(doc, cdt, cdn) {
 		if (frappe.meta.get_docfield(cdt, "stock_qty", cdn)) {
 			var item = frappe.get_doc(cdt, cdn);
 			frappe.model.round_floats_in(item, ["qty", "conversion_factor"]);
@@ -399,8 +399,8 @@
 			this.toggle_conversion_factor(item);
 			this.frm.events.update_cost(this.frm);
 		}
-	},
-});
+	}
+};
 
 $.extend(cur_frm.cscript, new erpnext.bom.BomController({frm: cur_frm}));
 
diff --git a/erpnext/public/js/account_tree_grid.js b/erpnext/public/js/account_tree_grid.js
index 757f33e..413a5ee 100644
--- a/erpnext/public/js/account_tree_grid.js
+++ b/erpnext/public/js/account_tree_grid.js
@@ -14,9 +14,9 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.	If not, see <http://www.gnu.org/licenses/>.
 
-erpnext.AccountTreeGrid = frappe.views.TreeGridReport.extend({
-	init: function(wrapper, title) {
-		this._super({
+erpnext.AccountTreeGrid = class AccountTreeGrid extends frappe.views.TreeGridReport {
+	constructor(wrapper, title) {
+		super({
 			title: title,
 			parent: $(wrapper).find('.layout-main'),
 			page: wrapper.page,
@@ -33,8 +33,24 @@
 				}
 			},
 		});
-	},
-	setup_columns: function() {
+
+		this.filters = [
+			{fieldtype: "Select", label: __("Company"), link:"Company", fieldname: "company",
+				default_value: __("Select Company..."),
+				filter: function(val, item, opts, me) {
+					if (item.company == val || val == opts.default_value) {
+						return me.apply_zero_filter(val, item, opts, me);
+					}
+					return false;
+				}},
+			{fieldtype: "Select", label: "Fiscal Year", link:"Fiscal Year", fieldname: "fiscal_year",
+				default_value: __("Select Fiscal Year...")},
+			{fieldtype: "Date", label: __("From Date"), fieldname: "from_date"},
+			{fieldtype: "Label", label: __("To")},
+			{fieldtype: "Date", label: __("To Date"), fieldname: "to_date"}
+		]
+	}
+	setup_columns() {
 		this.columns = [
 			{id: "name", name: __("Account"), field: "name", width: 300, cssClass: "cell-title"},
 			{id: "opening_dr", name: __("Opening (Dr)"), field: "opening_dr", width: 100,
@@ -50,25 +66,10 @@
 			{id: "closing_cr", name: __("Closing (Cr)"), field: "closing_cr", width: 100,
 				formatter: this.currency_formatter}
 		];
+	}
 
-	},
-	filters: [
-		{fieldtype: "Select", label: __("Company"), link:"Company", fieldname: "company",
-			default_value: __("Select Company..."),
-			filter: function(val, item, opts, me) {
-				if (item.company == val || val == opts.default_value) {
-					return me.apply_zero_filter(val, item, opts, me);
-				}
-				return false;
-			}},
-		{fieldtype: "Select", label: "Fiscal Year", link:"Fiscal Year", fieldname: "fiscal_year",
-			default_value: __("Select Fiscal Year...")},
-		{fieldtype: "Date", label: __("From Date"), fieldname: "from_date"},
-		{fieldtype: "Label", label: __("To")},
-		{fieldtype: "Date", label: __("To Date"), fieldname: "to_date"}
-	],
-	setup_filters: function() {
-		this._super();
+	setup_filters() {
+		super.setup_filters();
 		var me = this;
 		// default filters
 		this.filter_inputs.fiscal_year.change(function() {
@@ -83,8 +84,8 @@
 		});
 		me.show_zero_check()
 		if(me.ignore_closing_entry) me.ignore_closing_entry();
-	},
-	prepare_data: function() {
+	}
+	prepare_data() {
 		var me = this;
 		if(!this.primary_data) {
 			// make accounts list
@@ -113,12 +114,12 @@
 		this.set_indent();
 		this.prepare_balances();
 
-	},
-	init_account: function(d) {
+	}
+	init_account(d) {
 		this.reset_item_values(d);
-	},
+	}
 
-	prepare_balances: function() {
+	prepare_balances() {
 		var gl = frappe.report_dump.data['GL Entry'];
 		var me = this;
 
@@ -139,8 +140,8 @@
 		});
 
 		this.update_groups();
-	},
-	update_balances: function(account, posting_date, v) {
+	}
+	update_balances(account, posting_date, v) {
 		// opening
 		if (posting_date < this.opening_date || v.is_opening === "Yes") {
 			if (account.report_type === "Profit and Loss" &&
@@ -161,8 +162,8 @@
 		var closing_bal = flt(account.opening_dr) - flt(account.opening_cr) +
 			flt(account.debit) - flt(account.credit);
 		this.set_debit_or_credit(account, "closing", closing_bal);
-	},
-	set_debit_or_credit: function(account, field, balance) {
+	}
+	set_debit_or_credit(account, field, balance) {
 		if(balance > 0) {
 			account[field+"_dr"] = balance;
 			account[field+"_cr"] = 0;
@@ -170,8 +171,8 @@
 			account[field+"_cr"] = Math.abs(balance);
 			account[field+"_dr"] = 0;
 		}
-	},
-	update_groups: function() {
+	}
+	update_groups() {
 		// update groups
 		var me= this;
 		$.each(this.data, function(i, account) {
@@ -202,9 +203,9 @@
 				}
 			}
 		});
-	},
+	}
 
-	set_fiscal_year: function() {
+	set_fiscal_year() {
 		if (this.opening_date > this.closing_date) {
 			frappe.msgprint(__("Opening Date should be before Closing Date"));
 			return;
@@ -223,9 +224,9 @@
 			frappe.msgprint(__("Opening Date and Closing Date should be within same Fiscal Year"));
 			return;
 		}
-	},
+	}
 
-	show_general_ledger: function(account) {
+	show_general_ledger(account) {
 		frappe.route_options = {
 			account: account,
 			company: this.company,
@@ -234,4 +235,4 @@
 		};
 		frappe.set_route("query-report", "General Ledger");
 	}
-});
+};
diff --git a/erpnext/public/js/controllers/buying.js b/erpnext/public/js/controllers/buying.js
index 67b12fb..8ceae83 100644
--- a/erpnext/public/js/controllers/buying.js
+++ b/erpnext/public/js/controllers/buying.js
@@ -9,14 +9,14 @@
 
 cur_frm.email_field = "contact_email";
 
-erpnext.buying.BuyingController = erpnext.TransactionController.extend({
-	setup: function() {
-		this._super();
-	},
+erpnext.buying.BuyingController = class BuyingController extends erpnext.TransactionController {
+	setup() {
+		super.setup();
+	}
 
-	onload: function(doc, cdt, cdn) {
+	onload(doc, cdt, cdn) {
 		this.setup_queries(doc, cdt, cdn);
-		this._super();
+		super.onload();
 
 		this.frm.set_query('shipping_rule', function() {
 			return {
@@ -48,9 +48,9 @@
 			});
 		}
 		/* eslint-enable */
-	},
+	}
 
-	setup_queries: function(doc, cdt, cdn) {
+	setup_queries(doc, cdt, cdn) {
 		var me = this;
 
 		if(this.frm.fields_dict.buying_price_list) {
@@ -109,9 +109,9 @@
 				return me.set_query_for_item_tax_template(doc, cdt, cdn)
 			});
 		}
-	},
+	}
 
-	refresh: function(doc) {
+	refresh(doc) {
 		frappe.dynamic_link = {doc: this.frm.doc, fieldname: 'supplier', doctype: 'Supplier'};
 
 		this.frm.toggle_display("supplier_name",
@@ -122,38 +122,38 @@
 			this.set_from_product_bundle();
 		}
 
-		this._super();
-	},
+		super.refresh();
+	}
 
-	supplier: function() {
+	supplier() {
 		var me = this;
 		erpnext.utils.get_party_details(this.frm, null, null, function(){
 			me.apply_price_list();
 		});
-	},
+	}
 
-	supplier_address: function() {
+	supplier_address() {
 		erpnext.utils.get_address_display(this.frm);
 		erpnext.utils.set_taxes_from_address(this.frm, "supplier_address", "supplier_address", "supplier_address");
-	},
+	}
 
-	buying_price_list: function() {
+	buying_price_list() {
 		this.apply_price_list();
-	},
+	}
 
-	discount_percentage: function(doc, cdt, cdn) {
+	discount_percentage(doc, cdt, cdn) {
 		var item = frappe.get_doc(cdt, cdn);
 		item.discount_amount = 0.0;
 		this.price_list_rate(doc, cdt, cdn);
-	},
+	}
 
-	discount_amount: function(doc, cdt, cdn) {
+	discount_amount(doc, cdt, cdn) {
 		var item = frappe.get_doc(cdt, cdn);
 		item.discount_percentage = 0.0;
 		this.price_list_rate(doc, cdt, cdn);
-	},
+	}
 
-	qty: function(doc, cdt, cdn) {
+	qty(doc, cdt, cdn) {
 		var item = frappe.get_doc(cdt, cdn);
 		if ((doc.doctype == "Purchase Receipt") || (doc.doctype == "Purchase Invoice" && (doc.update_stock || doc.is_return))) {
 			frappe.model.round_floats_in(item, ["qty", "received_qty"]);
@@ -168,22 +168,22 @@
 			item.rejected_qty = flt(item.received_qty - item.qty, precision("rejected_qty", item));
 			item.received_stock_qty = flt(item.conversion_factor, precision("conversion_factor", item)) * flt(item.received_qty);
 		}
-		this._super(doc, cdt, cdn);
-	},
+		super.qty(doc, cdt, cdn);
+	}
 
-	batch_no: function(doc, cdt, cdn) {
-		this._super(doc, cdt, cdn);
-	},
+	batch_no(doc, cdt, cdn) {
+		super.batch_no(doc, cdt, cdn);
+	}
 
-	received_qty: function(doc, cdt, cdn) {
+	received_qty(doc, cdt, cdn) {
 		this.calculate_accepted_qty(doc, cdt, cdn)
-	},
+	}
 
-	rejected_qty: function(doc, cdt, cdn) {
+	rejected_qty(doc, cdt, cdn) {
 		this.calculate_accepted_qty(doc, cdt, cdn)
-	},
+	}
 
-	calculate_accepted_qty: function(doc, cdt, cdn){
+	calculate_accepted_qty(doc, cdt, cdn){
 		var item = frappe.get_doc(cdt, cdn);
 		frappe.model.round_floats_in(item, ["received_qty", "rejected_qty"]);
 
@@ -191,9 +191,9 @@
 
 		item.qty = flt(item.received_qty - item.rejected_qty, precision("qty", item));
 		this.qty(doc, cdt, cdn);
-	},
+	}
 
-	validate_negative_quantity: function(cdt, cdn, item, fieldnames){
+	validate_negative_quantity(cdt, cdn, item, fieldnames){
 		if(!item || !fieldnames) { return }
 
 		var is_negative_qty = false;
@@ -206,9 +206,9 @@
 		}
 
 		return is_negative_qty
-	},
+	}
 
-	warehouse: function(doc, cdt, cdn) {
+	warehouse(doc, cdt, cdn) {
 		var item = frappe.get_doc(cdt, cdn);
 		if(item.item_code && item.warehouse) {
 			return this.frm.call({
@@ -220,9 +220,9 @@
 				}
 			});
 		}
-	},
+	}
 
-	project: function(doc, cdt, cdn) {
+	project(doc, cdt, cdn) {
 		var item = frappe.get_doc(cdt, cdn);
 		if(item.project) {
 			$.each(this.frm.doc["items"] || [],
@@ -233,48 +233,48 @@
 					}
 				});
 		}
-	},
+	}
 
-	rejected_warehouse: function(doc, cdt) {
+	rejected_warehouse(doc, cdt) {
 		// trigger autofill_warehouse only if parent rejected_warehouse field is triggered
 		if (["Purchase Invoice", "Purchase Receipt"].includes(cdt)) {
 			this.autofill_warehouse(doc.items, "rejected_warehouse", doc.rejected_warehouse);
 		}
-	},
+	}
 
-	category: function(doc, cdt, cdn) {
+	category(doc, cdt, cdn) {
 		// should be the category field of tax table
 		if(cdt != doc.doctype) {
 			this.calculate_taxes_and_totals();
 		}
-	},
-	add_deduct_tax: function(doc, cdt, cdn) {
+	}
+	add_deduct_tax(doc, cdt, cdn) {
 		this.calculate_taxes_and_totals();
-	},
+	}
 
-	set_from_product_bundle: function() {
+	set_from_product_bundle() {
 		var me = this;
 		this.frm.add_custom_button(__("Product Bundle"), function() {
 			erpnext.buying.get_items_from_product_bundle(me.frm);
 		}, __("Get Items From"));
-	},
+	}
 
-	shipping_address: function(){
+	shipping_address(){
 		var me = this;
 		erpnext.utils.get_address_display(this.frm, "shipping_address",
 			"shipping_address_display", true);
-	},
+	}
 
-	billing_address: function() {
+	billing_address() {
 		erpnext.utils.get_address_display(this.frm, "billing_address",
 			"billing_address_display", true);
-	},
+	}
 
-	tc_name: function() {
+	tc_name() {
 		this.get_terms();
-	},
+	}
 
-	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",
@@ -291,9 +291,9 @@
 				}
 			})
 		}
-	},
+	}
 
-	manufacturer: function(doc, cdt, cdn) {
+	manufacturer(doc, cdt, cdn) {
 		const row = locals[cdt][cdn];
 
 		if(row.manufacturer) {
@@ -310,9 +310,9 @@
 				}
 			});
 		}
-	},
+	}
 
-	manufacturer_part_no: function(doc, cdt, cdn) {
+	manufacturer_part_no(doc, cdt, cdn) {
 		const row = locals[cdt][cdn];
 
 		if (row.manufacturer_part_no) {
@@ -335,7 +335,7 @@
 
 			}
 		}
-});
+};
 
 cur_frm.add_fetch('project', 'cost_center', 'cost_center');
 
@@ -496,4 +496,4 @@
 	});
 
 	dialog.show();
-}
\ No newline at end of file
+}
diff --git a/erpnext/public/js/controllers/stock_controller.js b/erpnext/public/js/controllers/stock_controller.js
index 87b21b7..d346357 100644
--- a/erpnext/public/js/controllers/stock_controller.js
+++ b/erpnext/public/js/controllers/stock_controller.js
@@ -3,22 +3,22 @@
 
 frappe.provide("erpnext.stock");
 
-erpnext.stock.StockController = frappe.ui.form.Controller.extend({
-	onload: function() {
+erpnext.stock.StockController = class StockController extends frappe.ui.form.Controller {
+	onload() {
 		// warehouse query if company
 		if (this.frm.fields_dict.company) {
 			this.setup_warehouse_query();
 		}
-	},
+	}
 
-	setup_warehouse_query: function() {
+	setup_warehouse_query() {
 		var me = this;
 		erpnext.queries.setup_queries(this.frm, "Warehouse", function() {
 			return erpnext.queries.warehouse(me.frm.doc);
 		});
-	},
+	}
 
-	setup_posting_date_time_check: function() {
+	setup_posting_date_time_check() {
 		// make posting date default and read only unless explictly checked
 		frappe.ui.form.on(this.frm.doctype, 'set_posting_date_and_time_read_only', function(frm) {
 			if(frm.doc.docstatus == 0 && frm.doc.set_posting_time) {
@@ -46,9 +46,9 @@
 				frm.trigger('set_posting_date_and_time_read_only');
 			}
 		});
-	},
+	}
 
-	show_stock_ledger: function() {
+	show_stock_ledger() {
 		var me = this;
 		if(this.frm.doc.docstatus > 0) {
 			cur_frm.add_custom_button(__("Stock Ledger"), function() {
@@ -63,9 +63,9 @@
 			}, __("View"));
 		}
 
-	},
+	}
 
-	show_general_ledger: function() {
+	show_general_ledger() {
 		var me = this;
 		if(this.frm.doc.docstatus > 0) {
 			cur_frm.add_custom_button(__('Accounting Ledger'), function() {
@@ -81,4 +81,4 @@
 			}, __("View"));
 		}
 	}
-});
+};
diff --git a/erpnext/public/js/controllers/taxes_and_totals.js b/erpnext/public/js/controllers/taxes_and_totals.js
index 3a3ee38..448bb65 100644
--- a/erpnext/public/js/controllers/taxes_and_totals.js
+++ b/erpnext/public/js/controllers/taxes_and_totals.js
@@ -1,12 +1,12 @@
 // Copyright (c) 2015, Frappe Technologies Pvt. Ltd. and Contributors
 // License: GNU General Public License v3. See license.txt
 
-erpnext.taxes_and_totals = erpnext.payments.extend({
-	setup: function() {
+erpnext.taxes_and_totals = class taxes_and_totals extends erpnext.payments {
+	setup() {
 		this.fetch_round_off_accounts();
-	},
+	}
 
-	apply_pricing_rule_on_item: function(item) {
+	apply_pricing_rule_on_item(item) {
 		let effective_item_rate = item.price_list_rate;
 		let item_rate = item.rate;
 		if (in_list(["Sales Order", "Quotation"], item.parenttype) && item.blanket_order_rate) {
@@ -32,9 +32,9 @@
 		}
 
 		frappe.model.set_value(item.doctype, item.name, "rate", item_rate);
-	},
+	}
 
-	calculate_taxes_and_totals: function(update_paid_amount) {
+	calculate_taxes_and_totals(update_paid_amount) {
 		this.discount_amount_applied = false;
 		this._calculate_taxes_and_totals();
 		this.calculate_discount_amount();
@@ -63,16 +63,16 @@
 		}
 
 		this.frm.refresh_fields();
-	},
+	}
 
-	calculate_discount_amount: function(){
+	calculate_discount_amount(){
 		if (frappe.meta.get_docfield(this.frm.doc.doctype, "discount_amount")) {
 			this.set_discount_amount();
 			this.apply_discount_amount();
 		}
-	},
+	}
 
-	_calculate_taxes_and_totals: function() {
+	_calculate_taxes_and_totals() {
 		this.validate_conversion_rate();
 		this.calculate_item_values();
 		this.initialize_taxes();
@@ -82,9 +82,9 @@
 		this.manipulate_grand_total_for_inclusive_tax();
 		this.calculate_totals();
 		this._cleanup();
-	},
+	}
 
-	validate_conversion_rate: function() {
+	validate_conversion_rate() {
 		this.frm.doc.conversion_rate = flt(this.frm.doc.conversion_rate, (cur_frm) ? precision("conversion_rate") : 9);
 		var conversion_rate_label = frappe.meta.get_label(this.frm.doc.doctype, "conversion_rate",
 			this.frm.doc.name);
@@ -99,9 +99,9 @@
 				frappe.throw(err_message);
 			}
 		}
-	},
+	}
 
-	calculate_item_values: function() {
+	calculate_item_values() {
 		var me = this;
 		if (!this.discount_amount_applied) {
 			$.each(this.frm.doc["items"] || [], function(i, item) {
@@ -121,16 +121,16 @@
 				me.set_in_company_currency(item, ["price_list_rate", "rate", "amount", "net_rate", "net_amount"]);
 			});
 		}
-	},
+	}
 
-	set_in_company_currency: function(doc, fields) {
+	set_in_company_currency(doc, fields) {
 		var me = this;
 		$.each(fields, function(i, f) {
 			doc["base_"+f] = flt(flt(doc[f], precision(f, doc)) * me.frm.doc.conversion_rate, precision("base_" + f, doc));
 		});
-	},
+	}
 
-	initialize_taxes: function() {
+	initialize_taxes() {
 		var me = this;
 
 		$.each(this.frm.doc["taxes"] || [], function(i, tax) {
@@ -152,9 +152,9 @@
 			}
 			frappe.model.round_floats_in(tax);
 		});
-	},
+	}
 
-	fetch_round_off_accounts: function() {
+	fetch_round_off_accounts() {
 		let me = this;
 		frappe.flags.round_off_applicable_accounts = [];
 
@@ -170,9 +170,9 @@
 				}
 			});
 		}
-	},
+	}
 
-	determine_exclusive_rate: function() {
+	determine_exclusive_rate() {
 		var me = this;
 
 		var has_inclusive_tax = false;
@@ -210,9 +210,9 @@
 				me.set_in_company_currency(item, ["net_rate", "net_amount"]);
 			}
 		});
-	},
+	}
 
-	get_current_tax_fraction: function(tax, item_tax_map) {
+	get_current_tax_fraction(tax, item_tax_map) {
 		// Get tax fraction for calculating tax exclusive amount
 		// from tax inclusive amount
 		var current_tax_fraction = 0.0;
@@ -241,14 +241,14 @@
 			inclusive_tax_amount_per_qty *= -1;
 		}
 		return [current_tax_fraction, inclusive_tax_amount_per_qty];
-	},
+	}
 
-	_get_tax_rate: function(tax, item_tax_map) {
+	_get_tax_rate(tax, item_tax_map) {
 		return (Object.keys(item_tax_map).indexOf(tax.account_head) != -1) ?
 			flt(item_tax_map[tax.account_head], precision("rate", tax)) : tax.rate;
-	},
+	}
 
-	calculate_net_total: function() {
+	calculate_net_total() {
 		var me = this;
 		this.frm.doc.total_qty = this.frm.doc.total = this.frm.doc.base_total = this.frm.doc.net_total = this.frm.doc.base_net_total = 0.0;
 
@@ -261,9 +261,9 @@
 			});
 
 		frappe.model.round_floats_in(this.frm.doc, ["total", "base_total", "net_total", "base_net_total"]);
-	},
+	}
 
-	calculate_taxes: function() {
+	calculate_taxes() {
 		var me = this;
 		this.frm.doc.rounding_adjustment = 0;
 		var actual_tax_dict = {};
@@ -339,9 +339,9 @@
 				}
 			});
 		});
-	},
+	}
 
-	set_cumulative_total: function(row_idx, tax) {
+	set_cumulative_total(row_idx, tax) {
 		var tax_amount = tax.tax_amount_after_discount_amount;
 		if (tax.category == 'Valuation') {
 			tax_amount = 0;
@@ -354,13 +354,13 @@
 		} else {
 			tax.total = flt(this.frm.doc["taxes"][row_idx-1].total + tax_amount, precision("total", tax));
 		}
-	},
+	}
 
-	_load_item_tax_rate: function(item_tax_rate) {
+	_load_item_tax_rate(item_tax_rate) {
 		return item_tax_rate ? JSON.parse(item_tax_rate) : {};
-	},
+	}
 
-	get_current_tax_amount: function(item, tax, item_tax_map) {
+	get_current_tax_amount(item, tax, item_tax_map) {
 		var tax_rate = this._get_tax_rate(tax, item_tax_map);
 		var current_tax_amount = 0.0;
 
@@ -397,17 +397,17 @@
 		this.set_item_wise_tax(item, tax, tax_rate, current_tax_amount);
 
 		return current_tax_amount;
-	},
+	}
 
-	get_final_tax_amount: function(tax, current_tax_amount) {
+	get_final_tax_amount(tax, current_tax_amount) {
 		if (frappe.flags.round_off_applicable_accounts.includes(tax.account_head)) {
 			current_tax_amount = Math.round(current_tax_amount);
 		}
 
 		return current_tax_amount;
-	},
+	}
 
-	set_item_wise_tax: function(item, tax, tax_rate, current_tax_amount) {
+	set_item_wise_tax(item, tax, tax_rate, current_tax_amount) {
 		// store tax breakup for each item
 		let tax_detail = tax.item_wise_tax_detail;
 		let key = item.item_code || item.item_name;
@@ -417,14 +417,14 @@
 			item_wise_tax_amount += tax_detail[key][1];
 
 		tax_detail[key] = [tax_rate, flt(item_wise_tax_amount, precision("base_tax_amount", tax))];
-	},
+	}
 
-	round_off_totals: function(tax) {
+	round_off_totals(tax) {
 		tax.tax_amount = flt(tax.tax_amount, precision("tax_amount", tax));
 		tax.tax_amount_after_discount_amount = flt(tax.tax_amount_after_discount_amount, precision("tax_amount", tax));
-	},
+	}
 
-	manipulate_grand_total_for_inclusive_tax: function() {
+	manipulate_grand_total_for_inclusive_tax() {
 		var me = this;
 		// if fully inclusive taxes and diff
 		if (this.frm.doc["taxes"] && this.frm.doc["taxes"].length) {
@@ -455,9 +455,9 @@
 				}
 			}
 		}
-	},
+	}
 
-	calculate_totals: function() {
+	calculate_totals() {
 		// Changing sequence can cause rounding_adjustmentng issue and on-screen discrepency
 		var me = this;
 		var tax_count = this.frm.doc["taxes"] ? this.frm.doc["taxes"].length : 0;
@@ -503,9 +503,9 @@
 
 		// rounded totals
 		this.set_rounded_total();
-	},
+	}
 
-	set_rounded_total: function() {
+	set_rounded_total() {
 		var disable_rounded_total = 0;
 		if(frappe.meta.get_docfield(this.frm.doc.doctype, "disable_rounded_total", this.frm.doc.name)) {
 			disable_rounded_total = this.frm.doc.disable_rounded_total;
@@ -527,9 +527,9 @@
 
 			this.set_in_company_currency(this.frm.doc, ["rounding_adjustment", "rounded_total"]);
 		}
-	},
+	}
 
-	_cleanup: function() {
+	_cleanup() {
 		this.frm.doc.base_in_words = this.frm.doc.in_words = "";
 
 		if(this.frm.doc["items"] && this.frm.doc["items"].length) {
@@ -556,16 +556,16 @@
 				tax.item_wise_tax_detail = JSON.stringify(tax.item_wise_tax_detail);
 			});
 		}
-	},
+	}
 
-	set_discount_amount: function() {
+	set_discount_amount() {
 		if(this.frm.doc.additional_discount_percentage) {
 			this.frm.doc.discount_amount = flt(flt(this.frm.doc[frappe.scrub(this.frm.doc.apply_discount_on)])
 				* this.frm.doc.additional_discount_percentage / 100, precision("discount_amount"));
 		}
-	},
+	}
 
-	apply_discount_amount: function() {
+	apply_discount_amount() {
 		var me = this;
 		var distributed_amount = 0.0;
 		this.frm.doc.base_discount_amount = 0.0;
@@ -603,9 +603,9 @@
 				this._calculate_taxes_and_totals();
 			}
 		}
-	},
+	}
 
-	get_total_for_discount_amount: function() {
+	get_total_for_discount_amount() {
 		if(this.frm.doc.apply_discount_on == "Net Total") {
 			return this.frm.doc.net_total;
 		} else {
@@ -629,27 +629,27 @@
 
 			return flt(this.frm.doc.grand_total - total_actual_tax, precision("grand_total"));
 		}
-	},
+	}
 
-	calculate_total_advance: function(update_paid_amount) {
+	calculate_total_advance(update_paid_amount) {
 		var total_allocated_amount = frappe.utils.sum($.map(this.frm.doc["advances"] || [], function(adv) {
 			return flt(adv.allocated_amount, precision("allocated_amount", adv));
 		}));
 		this.frm.doc.total_advance = flt(total_allocated_amount, precision("total_advance"));
 
 		this.calculate_outstanding_amount(update_paid_amount);
-	},
+	}
 
-	is_internal_invoice: function() {
+	is_internal_invoice() {
 		if (['Sales Invoice', 'Purchase Invoice'].includes(this.frm.doc.doctype)) {
 			if (this.frm.doc.company === this.frm.doc.represents_company) {
 				return true;
 			}
 		}
 		return false;
-	},
+	}
 
-	calculate_outstanding_amount: function(update_paid_amount) {
+	calculate_outstanding_amount(update_paid_amount) {
 		// NOTE:
 		// paid_amount and write_off_amount is only for POS/Loyalty Point Redemption Invoice
 		// total_advance is only for non POS Invoice
@@ -697,9 +697,9 @@
 			this.frm.doc.outstanding_amount =  flt(total_amount_to_pay - flt(paid_amount) +
 				flt(this.frm.doc.change_amount * this.frm.doc.conversion_rate), precision("outstanding_amount"));
 		}
-	},
+	}
 
-	update_paid_amount_for_return: function() {
+	update_paid_amount_for_return() {
 		var grand_total = this.frm.doc.rounded_total || this.frm.doc.grand_total;
 
 		if(this.frm.doc.party_account_currency == this.frm.doc.currency) {
@@ -723,9 +723,9 @@
 		this.frm.refresh_fields();
 
 		this.calculate_paid_amount();
-	},
+	}
 
-	set_default_payment: function(total_amount_to_pay, update_paid_amount) {
+	set_default_payment(total_amount_to_pay, update_paid_amount) {
 		var me = this;
 		var payment_status = true;
 		if(this.frm.doc.is_pos && (update_paid_amount===undefined || update_paid_amount)) {
@@ -741,9 +741,9 @@
 				}
 			});
 		}
-	},
+	}
 
-	calculate_paid_amount: function() {
+	calculate_paid_amount() {
 		var me = this;
 		var paid_amount = 0.0;
 		var base_paid_amount = 0.0;
@@ -763,9 +763,9 @@
 
 		this.frm.set_value('paid_amount', flt(paid_amount, precision("paid_amount")));
 		this.frm.set_value('base_paid_amount', flt(base_paid_amount, precision("base_paid_amount")));
-	},
+	}
 
-	calculate_change_amount: function(){
+	calculate_change_amount(){
 		this.frm.doc.change_amount = 0.0;
 		this.frm.doc.base_change_amount = 0.0;
 		if(in_list(["Sales Invoice", "POS Invoice"], this.frm.doc.doctype)
@@ -784,9 +784,9 @@
 					precision("base_change_amount"));
 			}
 		}
-	},
+	}
 
-	calculate_write_off_amount: function(){
+	calculate_write_off_amount(){
 		if(this.frm.doc.paid_amount > this.frm.doc.grand_total){
 			this.frm.doc.write_off_amount = flt(this.frm.doc.grand_total - this.frm.doc.paid_amount
 				+ this.frm.doc.change_amount, precision("write_off_amount"));
@@ -798,4 +798,4 @@
 		}
 		this.calculate_outstanding_amount(false);
 	}
-});
+};
diff --git a/erpnext/public/js/controllers/transaction.js b/erpnext/public/js/controllers/transaction.js
index 1c0abdf..a4c165e 100644
--- a/erpnext/public/js/controllers/transaction.js
+++ b/erpnext/public/js/controllers/transaction.js
@@ -3,9 +3,9 @@
 
 frappe.provide('erpnext.accounts.dimensions');
 
-erpnext.TransactionController = erpnext.taxes_and_totals.extend({
-	setup: function() {
-		this._super();
+erpnext.TransactionController = class TransactionController extends erpnext.taxes_and_totals {
+	setup() {
+		super.setup();
 		frappe.flags.hide_serial_batch_dialog = true;
 		frappe.ui.form.on(this.frm.doctype + " Item", "rate", function(frm, cdt, cdn) {
 			var item = frappe.get_doc(cdt, cdn);
@@ -222,8 +222,8 @@
 			});
 		}
 
-	},
-	onload: function() {
+	}
+	onload() {
 		var me = this;
 
 		if(this.frm.doc.__islocal) {
@@ -249,15 +249,15 @@
 				}
 			]);
 		}
-	},
+	}
 
-	is_return: function() {
+	is_return() {
 		if(!this.frm.doc.is_return && this.frm.doc.return_against) {
 			this.frm.set_value('return_against', '');
 		}
-	},
+	}
 
-	setup_quality_inspection: function() {
+	setup_quality_inspection() {
 		if(!in_list(["Delivery Note", "Sales Invoice", "Purchase Receipt", "Purchase Invoice"], this.frm.doc.doctype)) {
 			return;
 		}
@@ -290,9 +290,9 @@
 				}
 			}
 		});
-	},
+	}
 
-	make_payment_request: function() {
+	make_payment_request() {
 		var me = this;
 		const payment_request_type = (in_list(['Sales Order', 'Sales Invoice'], this.frm.doc.doctype))
 			? "Inward" : "Outward";
@@ -314,9 +314,9 @@
 				}
 			}
 		})
-	},
+	}
 
-	onload_post_render: function() {
+	onload_post_render() {
 		if(this.frm.doc.__islocal && !(this.frm.doc.taxes || []).length
 			&& !(this.frm.doc.__onload ? this.frm.doc.__onload.load_after_mapping : false)) {
 			frappe.after_ajax(() => this.apply_default_taxes());
@@ -328,9 +328,9 @@
 			this.setup_item_selector();
 			this.frm.get_field("items").grid.set_multiple_add("item_code", "qty");
 		}
-	},
+	}
 
-	refresh: function() {
+	refresh() {
 		erpnext.toggle_naming_series();
 		erpnext.hide_company();
 		this.set_dynamic_labels();
@@ -360,9 +360,9 @@
 					.appendTo($input_group);
 			}
 		}
-	},
+	}
 
-	scan_barcode: function() {
+	scan_barcode() {
 		let scan_barcode_field = this.frm.fields_dict["scan_barcode"];
 
 		let show_description = function(idx, exist = null) {
@@ -434,9 +434,9 @@
 			});
 		}
 		return false;
-	},
+	}
 
-	apply_default_taxes: function() {
+	apply_default_taxes() {
 		var me = this;
 		var taxes_and_charges_field = frappe.meta.get_docfield(me.frm.doc.doctype, "taxes_and_charges",
 			me.frm.doc.name);
@@ -475,22 +475,22 @@
 				}
 			});
 		}
-	},
+	}
 
-	setup_sms: function() {
+	setup_sms() {
 		var me = this;
 		let blacklist = ['Purchase Invoice', 'BOM'];
 		if(this.frm.doc.docstatus===1 && !in_list(["Lost", "Stopped", "Closed"], this.frm.doc.status)
 			&& !blacklist.includes(this.frm.doctype)) {
 			this.frm.page.add_menu_item(__('Send SMS'), function() { me.send_sms(); });
 		}
-	},
+	}
 
-	send_sms: function() {
+	send_sms() {
 		var sms_man = new erpnext.SMSManager(this.frm.doc);
-	},
+	}
 
-	barcode: function(doc, cdt, cdn) {
+	barcode(doc, cdt, cdn) {
 		var d = locals[cdt][cdn];
 		if(d.barcode=="" || d.barcode==null) {
 			// barcode cleared, remove item
@@ -499,9 +499,9 @@
 
 		this.frm.from_barcode = this.frm.from_barcode ? this.frm.from_barcode + 1 : 1;
 		this.item_code(doc, cdt, cdn);
-	},
+	}
 
-	item_code: function(doc, cdt, cdn) {
+	item_code(doc, cdt, cdn) {
 		var me = this;
 		var item = frappe.get_doc(cdt, cdn);
 		var update_stock = 0, show_batch_dialog = 0;
@@ -647,9 +647,9 @@
 				});
 			}
 		}
-	},
+	}
 
-	price_list_rate: function(doc, cdt, cdn) {
+	price_list_rate(doc, cdt, cdn) {
 		var item = frappe.get_doc(cdt, cdn);
 		frappe.model.round_floats_in(item, ["price_list_rate", "discount_percentage"]);
 
@@ -661,17 +661,17 @@
 				precision("rate", item));
 
 		this.calculate_taxes_and_totals();
-	},
+	}
 
-	margin_rate_or_amount: function(doc, cdt, cdn) {
+	margin_rate_or_amount(doc, cdt, cdn) {
 		// calculated the revised total margin and rate on margin rate changes
 		let item = frappe.get_doc(cdt, cdn);
 		this.apply_pricing_rule_on_item(item);
 		this.calculate_taxes_and_totals();
 		cur_frm.refresh_fields();
-	},
+	}
 
-	margin_type: function(doc, cdt, cdn) {
+	margin_type(doc, cdt, cdn) {
 		// calculate the revised total margin and rate on margin type changes
 		let item = frappe.get_doc(cdt, cdn);
 		if (!item.margin_type) {
@@ -681,9 +681,9 @@
 			this.calculate_taxes_and_totals();
 			cur_frm.refresh_fields();
 		}
-	},
+	}
 
-	get_incoming_rate: function(item, posting_date, posting_time, voucher_type, company) {
+	get_incoming_rate(item, posting_date, posting_time, voucher_type, company) {
 
 		let item_args = {
 			'item_code': item.item_code,
@@ -706,9 +706,9 @@
 				frappe.model.set_value(item.doctype, item.name, 'rate', r.message * item.conversion_factor);
 			}
 		});
-	},
+	}
 
-	add_taxes_from_item_tax_template: function(item_tax_map) {
+	add_taxes_from_item_tax_template(item_tax_map) {
 		let me = this;
 
 		if(item_tax_map && cint(frappe.defaults.get_default("add_taxes_from_item_tax_template"))) {
@@ -726,9 +726,9 @@
 				}
 			});
 		}
-	},
+	}
 
-	serial_no: function(doc, cdt, cdn) {
+	serial_no(doc, cdt, cdn) {
 		var me = this;
 		var item = frappe.get_doc(cdt, cdn);
 
@@ -763,17 +763,17 @@
 				}
 			}
 		}
-	},
+	}
 
-	validate: function() {
+	validate() {
 		this.calculate_taxes_and_totals(false);
-	},
+	}
 
-	update_stock: function() {
+	update_stock() {
 		this.frm.trigger('set_default_internal_warehouse');
-	},
+	}
 
-	set_default_internal_warehouse: function() {
+	set_default_internal_warehouse() {
 		let me = this;
 		if ((this.frm.doc.doctype === 'Sales Invoice' && me.frm.doc.update_stock)
 			|| this.frm.doc.doctype == 'Delivery Note') {
@@ -792,9 +792,9 @@
 				});
 			}
 		}
-	},
+	}
 
-	company: function() {
+	company() {
 		var me = this;
 		var set_pricing = function() {
 			if(me.frm.doc.company && me.frm.fields_dict.currency) {
@@ -901,16 +901,16 @@
 		if(this.frm.doc.company) {
 			erpnext.last_selected_company = this.frm.doc.company;
 		}
-	},
+	}
 
-	transaction_date: function() {
+	transaction_date() {
 		if (this.frm.doc.transaction_date) {
 			this.frm.transaction_date = this.frm.doc.transaction_date;
 			frappe.ui.form.trigger(this.frm.doc.doctype, "currency");
 		}
-	},
+	}
 
-	posting_date: function() {
+	posting_date() {
 		var me = this;
 		if (this.frm.doc.posting_date) {
 			this.frm.posting_date = this.frm.doc.posting_date;
@@ -939,9 +939,9 @@
 				frappe.ui.form.trigger(me.frm.doc.doctype, "currency");
 			}
 		}
-	},
+	}
 
-	due_date: function() {
+	due_date() {
 		// due_date is to be changed, payment terms template and/or payment schedule must
 		// be removed as due_date is automatically changed based on payment terms
 		if (this.frm.doc.due_date && !this.frm.updating_party_details && !this.frm.doc.is_pos) {
@@ -964,13 +964,13 @@
 				frappe.msgprint(final_message);
 			}
 		}
-	},
+	}
 
-	bill_date: function() {
+	bill_date() {
 		this.posting_date();
-	},
+	}
 
-	recalculate_terms: function() {
+	recalculate_terms() {
 		const doc = this.frm.doc;
 		if (doc.payment_terms_template) {
 			this.payment_terms_template();
@@ -989,17 +989,17 @@
 				}
 			);
 		}
-	},
+	}
 
-	get_company_currency: function() {
+	get_company_currency() {
 		return erpnext.get_currency(this.frm.doc.company);
-	},
+	}
 
-	contact_person: function() {
+	contact_person() {
 		erpnext.utils.get_contact_details(this.frm);
-	},
+	}
 
-	currency: function() {
+	currency() {
 		/* manqala 19/09/2016: let the translation date be whichever of the transaction_date or posting_date is available */
 		var transaction_date = this.frm.doc.transaction_date || this.frm.doc.posting_date;
 		/* end manqala */
@@ -1021,9 +1021,9 @@
 		} else {
 			this.conversion_rate();
 		}
-	},
+	}
 
-	conversion_rate: function() {
+	conversion_rate() {
 		const me = this.frm;
 		if(this.frm.doc.currency === this.get_company_currency()) {
 			this.frm.set_value("conversion_rate", 1.0);
@@ -1043,9 +1043,9 @@
 		}
 		// Make read only if Accounts Settings doesn't allow stale rates
 		this.frm.set_df_property("conversion_rate", "read_only", erpnext.stale_rate_allowed() ? 0 : 1);
-	},
+	}
 
-	shipping_rule: function() {
+	shipping_rule() {
 		var me = this;
 		if(this.frm.doc.shipping_rule) {
 			return this.frm.call({
@@ -1061,9 +1061,9 @@
 		else {
 			me.calculate_taxes_and_totals();
 		}
-	},
+	}
 
-	set_margin_amount_based_on_currency: function(exchange_rate) {
+	set_margin_amount_based_on_currency(exchange_rate) {
 		if (in_list(["Quotation", "Sales Order", "Delivery Note", "Sales Invoice", "Purchase Invoice", "Purchase Order", "Purchase Receipt"]), this.frm.doc.doctype) {
 			var me = this;
 			$.each(this.frm.doc.items || [], function(i, d) {
@@ -1073,9 +1073,9 @@
 				}
 			});
 		}
-	},
+	}
 
-	set_actual_charges_based_on_currency: function(exchange_rate) {
+	set_actual_charges_based_on_currency(exchange_rate) {
 		var me = this;
 		$.each(this.frm.doc.taxes || [], function(i, d) {
 			if(d.charge_type == "Actual") {
@@ -1083,9 +1083,9 @@
 					flt(d.tax_amount) / flt(exchange_rate));
 			}
 		});
-	},
+	}
 
-	get_exchange_rate: function(transaction_date, from_currency, to_currency, callback) {
+	get_exchange_rate(transaction_date, from_currency, to_currency, callback) {
 		var args;
 		if (["Quotation", "Sales Order", "Delivery Note", "Sales Invoice"].includes(this.frm.doctype)) {
 			args = "for_selling";
@@ -1107,9 +1107,9 @@
 				callback(flt(r.message));
 			}
 		});
-	},
+	}
 
-	price_list_currency: function() {
+	price_list_currency() {
 		var me=this;
 		this.set_dynamic_labels();
 
@@ -1123,9 +1123,9 @@
 		} else {
 			this.plc_conversion_rate();
 		}
-	},
+	}
 
-	plc_conversion_rate: function() {
+	plc_conversion_rate() {
 		if(this.frm.doc.price_list_currency === this.get_company_currency()) {
 			this.frm.set_value("plc_conversion_rate", 1.0);
 		} else if(this.frm.doc.price_list_currency === this.frm.doc.currency
@@ -1137,9 +1137,9 @@
 		if(!this.in_apply_price_list) {
 			this.apply_price_list(null, true);
 		}
-	},
+	}
 
-	uom: function(doc, cdt, cdn) {
+	uom(doc, cdt, cdn) {
 		var me = this;
 		var item = frappe.get_doc(cdt, cdn);
 		if(item.item_code && item.uom) {
@@ -1157,9 +1157,9 @@
 			});
 		}
 		me.calculate_stock_uom_rate(doc, cdt, cdn);
-	},
+	}
 
-	conversion_factor: function(doc, cdt, cdn, dont_fetch_price_list_rate) {
+	conversion_factor(doc, cdt, cdn, dont_fetch_price_list_rate) {
 		if(frappe.meta.get_docfield(cdt, "stock_qty", cdn)) {
 			var item = frappe.get_doc(cdt, cdn);
 			frappe.model.round_floats_in(item, ["qty", "conversion_factor"]);
@@ -1179,35 +1179,35 @@
 			}
 			this.calculate_stock_uom_rate(doc, cdt, cdn);
 		}
-	},
+	}
 
-	batch_no: function(doc, cdt, cdn) {
+	batch_no(doc, cdt, cdn) {
 		let item = frappe.get_doc(cdt, cdn);
 		this.apply_price_list(item, true);
-	},
+	}
 
-	toggle_conversion_factor: function(item) {
+	toggle_conversion_factor(item) {
 		// toggle read only property for conversion factor field if the uom and stock uom are same
 		if(this.frm.get_field('items').grid.fields_map.conversion_factor) {
 			this.frm.fields_dict.items.grid.toggle_enable("conversion_factor",
 				((item.uom != item.stock_uom) && !frappe.meta.get_docfield(cur_frm.fields_dict.items.grid.doctype, "conversion_factor").read_only)? true: false);
 		}
 
-	},
+	}
 
-	qty: function(doc, cdt, cdn) {
+	qty(doc, cdt, cdn) {
 		let item = frappe.get_doc(cdt, cdn);
 		this.conversion_factor(doc, cdt, cdn, true);
 		this.calculate_stock_uom_rate(doc, cdt, cdn);
 		this.apply_pricing_rule(item, true);
-	},
+	}
 
-	calculate_stock_uom_rate: function(doc, cdt, cdn) {
+	calculate_stock_uom_rate(doc, cdt, cdn) {
 		let item = frappe.get_doc(cdt, cdn);
-		item.stock_uom_rate = flt(item.rate)/flt(item.conversion_factor);	
+		item.stock_uom_rate = flt(item.rate)/flt(item.conversion_factor);
 		refresh_field("stock_uom_rate", item.name, item.parentfield);
-	},
-	service_stop_date: function(frm, cdt, cdn) {
+	}
+	service_stop_date(frm, cdt, cdn) {
 		var child = locals[cdt][cdn];
 
 		if(child.service_stop_date) {
@@ -1223,9 +1223,9 @@
 				frappe.throw(__("Service Stop Date cannot be after Service End Date"));
 			}
 		}
-	},
+	}
 
-	service_start_date: function(frm, cdt, cdn) {
+	service_start_date(frm, cdt, cdn) {
 		var child = locals[cdt][cdn];
 
 		if(child.service_start_date) {
@@ -1237,9 +1237,9 @@
 				}
 			})
 		}
-	},
+	}
 
-	calculate_net_weight: function(){
+	calculate_net_weight(){
 		/* Calculate Total Net Weight then further applied shipping rule to calculate shipping charges.*/
 		var me = this;
 		this.frm.doc.total_net_weight= 0.0;
@@ -1249,9 +1249,9 @@
 		});
 		refresh_field("total_net_weight");
 		this.shipping_rule();
-	},
+	}
 
-	set_dynamic_labels: function() {
+	set_dynamic_labels() {
 		// What TODO? should we make price list system non-mandatory?
 		this.frm.toggle_reqd("plc_conversion_rate",
 			!!(this.frm.doc.price_list_name && this.frm.doc.price_list_currency));
@@ -1260,9 +1260,9 @@
 		this.change_form_labels(company_currency);
 		this.change_grid_labels(company_currency);
 		this.frm.refresh_fields();
-	},
+	}
 
-	change_form_labels: function(company_currency) {
+	change_form_labels(company_currency) {
 		var me = this;
 
 		this.frm.set_currency_labels(["base_total", "base_net_total", "base_total_taxes_and_charges",
@@ -1309,9 +1309,9 @@
 		if(frappe.meta.get_docfield(cur_frm.doctype, "base_net_total"))
 			cur_frm.toggle_display("base_net_total", (show && (me.frm.doc.currency != company_currency)));
 
-	},
+	}
 
-	change_grid_labels: function(company_currency) {
+	change_grid_labels(company_currency) {
 		var me = this;
 
 		this.frm.set_currency_labels(["base_rate", "base_net_rate", "base_price_list_rate", "base_amount", "base_net_amount", "base_rate_with_margin"],
@@ -1375,21 +1375,21 @@
 
 		// set labels
 		var $wrapper = $(this.frm.wrapper);
-	},
+	}
 
-	recalculate: function() {
+	recalculate() {
 		this.calculate_taxes_and_totals();
-	},
+	}
 
-	recalculate_values: function() {
+	recalculate_values() {
 		this.calculate_taxes_and_totals();
-	},
+	}
 
-	calculate_charges: function() {
+	calculate_charges() {
 		this.calculate_taxes_and_totals();
-	},
+	}
 
-	ignore_pricing_rule: function() {
+	ignore_pricing_rule() {
 		if(this.frm.doc.ignore_pricing_rule) {
 			var me = this;
 			var item_list = [];
@@ -1423,9 +1423,9 @@
 		} else {
 			this.apply_pricing_rule();
 		}
-	},
+	}
 
-	apply_pricing_rule: function(item, calculate_taxes_and_totals) {
+	apply_pricing_rule(item, calculate_taxes_and_totals) {
 		var me = this;
 		var args = this._get_args(item);
 		if (!(args.items && args.items.length)) {
@@ -1444,9 +1444,9 @@
 				}
 			}
 		});
-	},
+	}
 
-	_get_args: function(item) {
+	_get_args(item) {
 		var me = this;
 		return {
 			"items": this._get_item_list(item),
@@ -1474,9 +1474,9 @@
 			"pos_profile": me.frm.doc.doctype == 'Sales Invoice' ? me.frm.doc.pos_profile : '',
 			"coupon_code": me.frm.doc.coupon_code
 		};
-	},
+	}
 
-	_get_item_list: function(item) {
+	_get_item_list(item) {
 		var item_list = [];
 		var append_item = function(d) {
 			if (d.item_code) {
@@ -1517,9 +1517,9 @@
 			});
 		}
 		return item_list;
-	},
+	}
 
-	_set_values_for_item_list: function(children) {
+	_set_values_for_item_list(children) {
 		var me = this;
 		var price_list_rate_changed = false;
 		var items_rule_dict = {};
@@ -1556,9 +1556,9 @@
 		me.apply_rule_on_other_items(items_rule_dict);
 
 		if(!price_list_rate_changed) me.calculate_taxes_and_totals();
-	},
+	}
 
-	apply_rule_on_other_items: function(args) {
+	apply_rule_on_other_items(args) {
 		const me = this;
 		const fields = ["discount_percentage", "pricing_rules", "discount_amount", "rate"];
 
@@ -1577,9 +1577,9 @@
 				});
 			}
 		}
-	},
+	}
 
-	apply_product_discount: function(free_item_data) {
+	apply_product_discount(free_item_data) {
 		const items = this.frm.doc.items.filter(d => (d.item_code == free_item_data.item_code
 			&& d.is_free_item)) || [];
 
@@ -1593,9 +1593,9 @@
 		} if (items && items.length && free_item_data) {
 			items[0].qty = free_item_data.qty
 		}
-	},
+	}
 
-	apply_price_list: function(item, reset_plc_conversion) {
+	apply_price_list(item, reset_plc_conversion) {
 		// We need to reset plc_conversion_rate sometimes because the call to
 		// `erpnext.stock.get_item_details.apply_price_list` is sensitive to its value
 		if (!reset_plc_conversion) {
@@ -1634,9 +1634,9 @@
 		}).always(() => {
 			me.in_apply_price_list = false;
 		});
-	},
+	}
 
-	remove_pricing_rule: function(item) {
+	remove_pricing_rule(item) {
 		let me = this;
 		const fields = ["discount_percentage",
 			"discount_amount", "margin_rate_or_amount", "rate_with_margin"];
@@ -1670,18 +1670,18 @@
 
 			me.trigger_price_list_rate();
 		}
-	},
+	}
 
-	trigger_price_list_rate: function() {
+	trigger_price_list_rate() {
 		var me  = this;
 
 		this.frm.doc.items.forEach(child_row => {
 			me.frm.script_manager.trigger("price_list_rate",
 				child_row.doctype, child_row.name);
 		})
-	},
+	}
 
-	validate_company_and_party: function() {
+	validate_company_and_party() {
 		var me = this;
 		var valid = true;
 
@@ -1696,9 +1696,9 @@
 			}
 		});
 		return valid;
-	},
+	}
 
-	get_terms: function() {
+	get_terms() {
 		var me = this;
 
 		erpnext.utils.get_terms(this.frm.doc.tc_name, this.frm.doc, function(r) {
@@ -1706,9 +1706,9 @@
 				me.frm.set_value("terms", r.message);
 			}
 		});
-	},
+	}
 
-	taxes_and_charges: function() {
+	taxes_and_charges() {
 		var me = this;
 		if(this.frm.doc.taxes_and_charges) {
 			return this.frm.call({
@@ -1734,9 +1734,9 @@
 				}
 			});
 		}
-	},
+	}
 
-	tax_category: function() {
+	tax_category() {
 		var me = this;
 		if(me.frm.updating_party_details) return;
 
@@ -1744,9 +1744,9 @@
 			() => this.update_item_tax_map(),
 			() => erpnext.utils.set_taxes(this.frm, "tax_category"),
 		]);
-	},
+	}
 
-	item_tax_template: function(doc, cdt, cdn) {
+	item_tax_template(doc, cdt, cdn) {
 		var me = this;
 		if(me.frm.updating_party_details) return;
 
@@ -1772,9 +1772,9 @@
 			item.item_tax_rate = "{}";
 			me.calculate_taxes_and_totals();
 		}
-	},
+	}
 
-	update_item_tax_map: function() {
+	update_item_tax_map() {
 		var me = this;
 		var item_codes = [];
 		$.each(this.frm.doc.items || [], function(i, item) {
@@ -1810,9 +1810,9 @@
 				}
 			});
 		}
-	},
+	}
 
-	is_recurring: function() {
+	is_recurring() {
 		// set default values for recurring documents
 		if(this.frm.doc.is_recurring && this.frm.doc.__islocal) {
 			frappe.msgprint(__("Please set recurring after saving"));
@@ -1835,9 +1835,9 @@
 		}
 
 		refresh_many(["notification_email_address", "repeat_on_day_of_month"]);
-	},
+	}
 
-	from_date: function() {
+	from_date() {
 		// set to_date
 		if(this.frm.doc.from_date) {
 			var recurring_type_map = {'Monthly': 1, 'Quarterly': 3, 'Half-yearly': 6,
@@ -1851,25 +1851,25 @@
 				refresh_field('to_date');
 			}
 		}
-	},
+	}
 
-	set_gross_profit: function(item) {
+	set_gross_profit(item) {
 		if (["Sales Order", "Quotation"].includes(this.frm.doc.doctype) && item.valuation_rate) {
 			var rate = flt(item.rate) * flt(this.frm.doc.conversion_rate || 1);
 			item.gross_profit = flt(((rate - item.valuation_rate) * item.stock_qty), precision("amount", item));
 		}
-	},
+	}
 
-	setup_item_selector: function() {
+	setup_item_selector() {
 		// TODO: remove item selector
 
 		return;
 		// if(!this.item_selector) {
 		// 	this.item_selector = new erpnext.ItemSelector({frm: this.frm});
 		// }
-	},
+	}
 
-	get_advances: function() {
+	get_advances() {
 		if(!this.frm.is_return) {
 			return this.frm.call({
 				method: "set_advances",
@@ -1879,9 +1879,9 @@
 				}
 			})
 		}
-	},
+	}
 
-	make_payment_entry: function() {
+	make_payment_entry() {
 		return frappe.call({
 			method: cur_frm.cscript.get_method_for_payment(),
 			args: {
@@ -1894,9 +1894,9 @@
 				// cur_frm.refresh_fields()
 			}
 		});
-	},
+	}
 
-	get_method_for_payment: function(){
+	get_method_for_payment(){
 		var method = "erpnext.accounts.doctype.payment_entry.payment_entry.get_payment_entry";
 		if(cur_frm.doc.__onload && cur_frm.doc.__onload.make_payment_via_journal_entry){
 			if(in_list(['Sales Invoice', 'Purchase Invoice'],  cur_frm.doc.doctype)){
@@ -1907,9 +1907,9 @@
 		}
 
 		return method
-	},
+	}
 
-	set_query_for_batch: function(doc, cdt, cdn) {
+	set_query_for_batch(doc, cdt, cdn) {
 		// Show item's batches in the dropdown of batch no
 
 		var me = this;
@@ -1939,9 +1939,9 @@
 				filters: filters
 			}
 		}
-	},
+	}
 
-	set_query_for_item_tax_template: function(doc, cdt, cdn) {
+	set_query_for_item_tax_template(doc, cdt, cdn) {
 		var item = frappe.get_doc(cdt, cdn);
 		if(!item.item_code) {
 			return doc.company ? {filters: {company: doc.company}} : {};
@@ -1961,9 +1961,9 @@
 				filters: filters
 			}
 		}
-	},
+	}
 
-	payment_terms_template: function() {
+	payment_terms_template() {
 		var me = this;
 		const doc = this.frm.doc;
 		if(doc.payment_terms_template && doc.doctype !== 'Delivery Note') {
@@ -1983,9 +1983,9 @@
 				}
 			})
 		}
-	},
+	}
 
-	payment_term: function(doc, cdt, cdn) {
+	payment_term(doc, cdt, cdn) {
 		var row = locals[cdt][cdn];
 		if(row.payment_term) {
 			frappe.call({
@@ -2005,17 +2005,17 @@
 				}
 			})
 		}
-	},
+	}
 
-	against_blanket_order: function(doc, cdt, cdn) {
+	against_blanket_order(doc, cdt, cdn) {
 		var item = locals[cdt][cdn];
 		if(!item.against_blanket_order) {
 			frappe.model.set_value(this.frm.doctype + " Item", item.name, "blanket_order", null);
 			frappe.model.set_value(this.frm.doctype + " Item", item.name, "blanket_order_rate", 0.00);
 		}
-	},
+	}
 
-	blanket_order: function(doc, cdt, cdn) {
+	blanket_order(doc, cdt, cdn) {
 		var me = this;
 		var item = locals[cdt][cdn];
 		if (item.blanket_order && (item.parenttype=="Sales Order" || item.parenttype=="Purchase Order")) {
@@ -2043,34 +2043,34 @@
 				}
 			})
 		}
-	},
+	}
 
-	set_reserve_warehouse: function() {
+	set_reserve_warehouse() {
 		this.autofill_warehouse(this.frm.doc.supplied_items, "reserve_warehouse", this.frm.doc.set_reserve_warehouse);
-	},
+	}
 
-	set_warehouse: function() {
+	set_warehouse() {
 		this.autofill_warehouse(this.frm.doc.items, "warehouse", this.frm.doc.set_warehouse);
-	},
+	}
 
-	set_target_warehouse: function() {
+	set_target_warehouse() {
 		this.autofill_warehouse(this.frm.doc.items, "target_warehouse", this.frm.doc.set_target_warehouse);
-	},
+	}
 
-	set_from_warehouse: function() {
+	set_from_warehouse() {
 		this.autofill_warehouse(this.frm.doc.items, "from_warehouse", this.frm.doc.set_from_warehouse);
-	},
+	}
 
-	autofill_warehouse : function (child_table, warehouse_field, warehouse) {
+	autofill_warehouse(child_table, warehouse_field, warehouse) {
 		if (warehouse && child_table && child_table.length) {
 			let doctype = child_table[0].doctype;
 			$.each(child_table || [], function(i, item) {
 				frappe.model.set_value(doctype, item.name, warehouse_field, warehouse);
 			});
 		}
-	},
+	}
 
-	coupon_code: function() {
+	coupon_code() {
 		var me = this;
 		frappe.run_serially([
 			() => this.frm.doc.ignore_pricing_rule=1,
@@ -2079,7 +2079,7 @@
 			() => me.apply_pricing_rule()
 		]);
 	}
-});
+};
 
 erpnext.show_serial_batch_selector = function (frm, d, callback, on_close, show_dialog) {
 	let warehouse, receiving_stock, existing_stock;
diff --git a/erpnext/public/js/payment/payments.js b/erpnext/public/js/payment/payments.js
index 0d656bc..7df976c 100644
--- a/erpnext/public/js/payment/payments.js
+++ b/erpnext/public/js/payment/payments.js
@@ -1,31 +1,31 @@
 // Copyright (c) 2015, Frappe Technologies Pvt. Ltd. and Contributors
 // License: GNU General Public License v3. See license.txt
 
-erpnext.payments = erpnext.stock.StockController.extend({
-	make_payment: function() {
+erpnext.payments = class payments extends erpnext.stock.StockController {
+	make_payment() {
 		var me = this;
 
 		this.dialog = new frappe.ui.Dialog({
 			title: 'Payment'
 		});
-	
+
 		this.dialog.show();
 		this.$body = this.dialog.body;
 		this.set_payment_primary_action();
 		this.make_keyboard();
 		this.select_text()
-	},
+	}
 
-	select_text: function(){
+	select_text(){
 		var me = this;
 		$(this.$body).find('.form-control').click(function(){
 			$(this).select();
 		})
-	},
+	}
 
-	set_payment_primary_action: function(){
+	set_payment_primary_action(){
 		var me = this;
-	
+
 		this.dialog.set_primary_action(__("Submit"), function() {
 			// Allow no ZERO payment
 			$.each(me.frm.doc.payments, function (index, data) {
@@ -36,18 +36,18 @@
 				}
 			});
 		})
-	},
+	}
 
-	make_keyboard: function(){
+	make_keyboard(){
 		var me = this;
 		$(this.$body).empty();
 		$(this.$body).html(frappe.render_template('pos_payment', this.frm.doc))
 		this.show_payment_details();
 		this.bind_keyboard_event()
 		this.clear_amount()
-	},
+	}
 
-	make_multimode_payment: function(){
+	make_multimode_payment(){
 		var me = this;
 
 		if(this.frm.doc.change_amount > 0){
@@ -57,9 +57,9 @@
 		this.payments = frappe.model.add_child(this.frm.doc, 'Multi Mode Payment', "payments");
 		this.payments.mode_of_payment = this.dialog.fields_dict.mode_of_payment.get_value();
 		this.payments.amount = flt(this.payment_val);
-	},
+	}
 
-	show_payment_details: function(){
+	show_payment_details(){
 		var me = this;
 		var multimode_payments = $(this.$body).find('.multimode-payments').empty();
 		if(this.frm.doc.payments.length){
@@ -82,9 +82,9 @@
 		}else{
 			$("<p>No payment mode selected in pos profile</p>").appendTo(multimode_payments)
 		}
-	},
+	}
 
-	set_outstanding_amount: function(){
+	set_outstanding_amount(){
 		this.selected_mode = $(this.$body).find(repl("input[idx='%(idx)s']",{'idx': this.idx}));
 		this.highlight_selected_row()
 		this.payment_val = 0.0
@@ -99,47 +99,47 @@
 		}
 		this.selected_mode.select()
 		this.bind_amount_change_event();
-	},
-	
-	bind_keyboard_event: function(){
+	}
+
+	bind_keyboard_event(){
 		var me = this;
 		this.payment_val = '';
 		this.bind_form_control_event();
 		this.bind_numeric_keys_event();
-	},
+	}
 
-	bind_form_control_event: function(){
+	bind_form_control_event(){
 		var me = this;
 		$(this.$body).find('.pos-payment-row').click(function(){
 			me.idx = $(this).attr("idx");
 			me.set_outstanding_amount()
 		})
-		
+
 		$(this.$body).find('.form-control').click(function(){
 			me.idx = $(this).attr("idx");
 			me.set_outstanding_amount();
 			me.update_paid_amount(true);
 		})
-		
+
 		$(this.$body).find('.write_off_amount').change(function(){
 			me.write_off_amount(flt($(this).val()), precision("write_off_amount"));
 		})
-		
+
 		$(this.$body).find('.change_amount').change(function(){
 			me.change_amount(flt($(this).val()), precision("change_amount"));
 		})
-	},
+	}
 
-	highlight_selected_row: function(){
+	highlight_selected_row(){
 		var me = this;
 		var selected_row = $(this.$body).find(repl(".pos-payment-row[idx='%(idx)s']",{'idx': this.idx}));
 		$(this.$body).find('.pos-payment-row').removeClass('selected-payment-mode')
 		selected_row.addClass('selected-payment-mode')
 		$(this.$body).find('.amount').attr('disabled', true);
 		this.selected_mode.attr('disabled', false);
-	},
-	
-	bind_numeric_keys_event: function(){
+	}
+
+	bind_numeric_keys_event(){
 		var me = this;
 		$(this.$body).find('.pos-keyboard-key').click(function(){
 			me.payment_val += $(this).text();
@@ -147,7 +147,7 @@
 			me.idx = me.selected_mode.attr("idx")
 			me.update_paid_amount()
 		})
-		
+
 		$(this.$body).find('.delete-btn').click(function(){
 			me.payment_val =  cstr(flt(me.selected_mode.val())).slice(0, -1);
 			me.selected_mode.val(format_currency(me.payment_val, me.frm.doc.currency));
@@ -155,9 +155,9 @@
 			me.update_paid_amount();
 		})
 
-	},
-	
-	bind_amount_change_event: function(){
+	}
+
+	bind_amount_change_event(){
 		var me = this;
 		this.selected_mode.change(function(){
 			me.payment_val =  flt($(this).val()) || 0.0;
@@ -165,9 +165,9 @@
 			me.idx = me.selected_mode.attr("idx")
 			me.update_payment_amount()
 		})
-	},
+	}
 
-	clear_amount: function() {
+	clear_amount() {
 		var me = this;
 		$(this.$body).find('.clr').click(function(e){
 			e.stopPropagation();
@@ -178,9 +178,9 @@
 			me.highlight_selected_row();
 			me.update_payment_amount();
 		})
-	},
+	}
 
-	write_off_amount: function(write_off_amount) {
+	write_off_amount(write_off_amount) {
 		var me = this;
 
 		this.frm.doc.write_off_amount = flt(write_off_amount, precision("write_off_amount"));
@@ -188,17 +188,17 @@
 			precision("base_write_off_amount"));
 		this.calculate_outstanding_amount(false)
 		this.show_amounts()
-	},
+	}
 
-	change_amount: function(change_amount) {
+	change_amount(change_amount) {
 		var me = this;
 
 		this.frm.doc.change_amount = flt(change_amount, precision("change_amount"));
 		this.calculate_write_off_amount()
 		this.show_amounts()
-	},
+	}
 
-	update_paid_amount: function(update_write_off) {
+	update_paid_amount(update_write_off) {
 		var me = this;
 		if(in_list(['change_amount', 'write_off_amount'], this.idx)){
 			var value = me.selected_mode.val();
@@ -213,9 +213,9 @@
 		}else{
 			this.update_payment_amount()
 		}
-	},
+	}
 
-	update_payment_amount: function(){
+	update_payment_amount(){
 		var me = this;
 
 		$.each(this.frm.doc.payments, function(index, data){
@@ -226,9 +226,9 @@
 
 		this.calculate_outstanding_amount(false);
 		this.show_amounts();
-	},
+	}
 
-	show_amounts: function(){
+	show_amounts(){
 		var me = this;
 		$(this.$body).find(".write_off_amount").val(format_currency(this.frm.doc.write_off_amount, this.frm.doc.currency));
 		$(this.$body).find('.paid_amount').text(format_currency(this.frm.doc.paid_amount, this.frm.doc.currency));
@@ -236,4 +236,4 @@
 		$(this.$body).find('.outstanding_amount').text(format_currency(this.frm.doc.outstanding_amount, frappe.get_doc(":Company", this.frm.doc.company).default_currency))
 		this.update_invoice();
 	}
-})
\ No newline at end of file
+}
diff --git a/erpnext/public/js/stock_analytics.js b/erpnext/public/js/stock_analytics.js
index 140c9dc..c74b45e 100644
--- a/erpnext/public/js/stock_analytics.js
+++ b/erpnext/public/js/stock_analytics.js
@@ -2,8 +2,8 @@
 // License: GNU General Public License v3. See license.txt
 
 
-erpnext.StockAnalytics = erpnext.StockGridReport.extend({
-	init: function(wrapper, opts) {
+erpnext.StockAnalytics = class StockAnalytics extends erpnext.StockGridReport {
+	constructor(wrapper, opts) {
 		var args = {
 			title: __("Stock Analytics"),
 			parent: $(wrapper).find('.layout-main'),
@@ -30,9 +30,9 @@
 
 		if(opts) $.extend(args, opts);
 
-		this._super(args);
-	},
-	setup_columns: function() {
+		super(args);
+	}
+	setup_columns() {
 		var std_columns = [
 			{id: "name", name: __("Item"), field: "name", width: 300},
 			{id: "brand", name: __("Brand"), field: "brand", width: 100},
@@ -43,8 +43,9 @@
 
 		this.make_date_range_columns();
 		this.columns = std_columns.concat(this.columns);
-	},
-	filters: [
+	}
+
+	filters = [
 		{fieldtype:"Select", label: __("Value or Qty"), fieldname: "value_or_qty",
 			options:[{label:__("Value"), value:"Value"}, {label:__("Quantity"), value:"Quantity"}],
 			filter: function(val, item, opts, me) {
@@ -66,20 +67,21 @@
 				{label:__("Quarterly"), value:"Quarterly"},
 				{label:__("Yearly"), value:"Yearly"},
 			]}
-	],
-	setup_filters: function() {
+	]
+
+	setup_filters() {
 		var me = this;
-		this._super();
+		super.setup_filters();
 
 		this.trigger_refresh_on_change(["value_or_qty", "brand", "warehouse", "range"]);
 
 		this.show_zero_check();
-	},
-	init_filter_values: function() {
-		this._super();
+	}
+	init_filter_values() {
+		super.init_filter_values();
 		this.filter_inputs.range && this.filter_inputs.range.val('Monthly');
-	},
-	prepare_data: function() {
+	}
+	prepare_data() {
 		var me = this;
 
 		if(!this.data) {
@@ -112,8 +114,8 @@
 		this.prepare_balances();
 		this.update_groups();
 
-	},
-	prepare_balances: function() {
+	}
+	prepare_balances() {
 		var me = this;
 		var from_date = frappe.datetime.str_to_obj(this.from_date);
 		var to_date = frappe.datetime.str_to_obj(this.to_date);
@@ -164,8 +166,8 @@
 				item.closing_qty_value += diff;
 			}
 		}
-	},
-	update_groups: function() {
+	}
+	update_groups() {
 		var me = this;
 		$.each(this.data, function(i, item) {
 			// update groups
@@ -192,8 +194,8 @@
 				}
 			}
 		});
-	},
-	show_stock_ledger: function(item_code) {
+	}
+	show_stock_ledger(item_code) {
 		frappe.route_options = {
 			item_code: item_code,
 			from_date: this.from_date,
@@ -201,5 +203,5 @@
 		};
 		frappe.set_route("query-report", "Stock Ledger");
 	}
-});
+};
 
diff --git a/erpnext/public/js/stock_grid_report.js b/erpnext/public/js/stock_grid_report.js
index 832fd3e..752fafd 100644
--- a/erpnext/public/js/stock_grid_report.js
+++ b/erpnext/public/js/stock_grid_report.js
@@ -1,16 +1,16 @@
 // Copyright (c) 2015, Frappe Technologies Pvt. Ltd. and Contributors
 // License: GNU General Public License v3. See license.txt
 
-erpnext.StockGridReport = frappe.views.TreeGridReport.extend({
-	get_item_warehouse: function(warehouse, item) {
+erpnext.StockGridReport = class StockGridReport extends frappe.views.TreeGridReport {
+	get_item_warehouse(warehouse, item) {
 		if(!this.item_warehouse[item]) this.item_warehouse[item] = {};
 		if(!this.item_warehouse[item][warehouse]) this.item_warehouse[item][warehouse] = {
 			balance_qty: 0.0, balance_value: 0.0, fifo_stack: []
 		};
 		return this.item_warehouse[item][warehouse];
-	},
+	}
 
-	get_value_diff: function(wh, sl, is_fifo) {
+	get_value_diff(wh, sl, is_fifo) {
 		// value
 		if(sl.qty > 0) {
 			// incoming - rate is given
@@ -59,8 +59,8 @@
 		wh.balance_qty += sl.qty;
 		wh.balance_value += value_diff;
 		return value_diff;
-	},
-	get_fifo_value_diff: function(wh, sl) {
+	}
+	get_fifo_value_diff(wh, sl) {
 		// get exact rate from fifo stack
 		var fifo_stack = (wh.fifo_stack || []).reverse();
 		var fifo_value_diff = 0.0;
@@ -89,9 +89,9 @@
 		// reset the updated stack
 		wh.fifo_stack = fifo_stack.reverse();
 		return -fifo_value_diff;
-	},
+	}
 
-	get_serialized_value_diff: function(sl) {
+	get_serialized_value_diff(sl) {
 		var me = this;
 
 		var value_diff = 0.0;
@@ -103,9 +103,9 @@
 		});
 
 		return value_diff;
-	},
+	}
 
-	get_serialized_buying_rates: function() {
+	get_serialized_buying_rates() {
 		var serialized_buying_rates = {};
 
 		if (frappe.report_dump.data["Serial No"]) {
@@ -115,5 +115,5 @@
 		}
 
 		return serialized_buying_rates;
-	},
-});
+	}
+};
diff --git a/erpnext/public/js/telephony.js b/erpnext/public/js/telephony.js
index 9548d6c..1c3e314 100644
--- a/erpnext/public/js/telephony.js
+++ b/erpnext/public/js/telephony.js
@@ -1,19 +1,19 @@
-frappe.ui.form.ControlData = frappe.ui.form.ControlData.extend( {
+frappe.ui.form.ControlData = class ControlData extends frappe.ui.form.ControlData  {
 	make_input() {
-		this._super();
+		super.make_input();
 		if (this.df.options == 'Phone') {
 			this.setup_phone();
 		}
 		if (this.frm && this.frm.fields_dict) {
 			Object.values(this.frm.fields_dict).forEach(function(field) {
-				if (field.df.read_only === 1 && field.df.options === 'Phone' 
+				if (field.df.read_only === 1 && field.df.options === 'Phone'
 					&& field.disp_area.style[0] != 'display' && !field.has_icon) {
 					field.setup_phone();
 					field.has_icon = true;
 				}
 			});
 		}
-	},
+	}
 	setup_phone() {
 		if (frappe.phone_call.handler) {
 			let control = this.df.read_only ? '.control-value' : '.control-input';
@@ -30,4 +30,4 @@
 				});
 		}
 	}
-});
+};
diff --git a/erpnext/public/js/utils/customer_quick_entry.js b/erpnext/public/js/utils/customer_quick_entry.js
index ebe6cd9..efb8dd9 100644
--- a/erpnext/public/js/utils/customer_quick_entry.js
+++ b/erpnext/public/js/utils/customer_quick_entry.js
@@ -1,17 +1,17 @@
 frappe.provide('frappe.ui.form');
 
-frappe.ui.form.CustomerQuickEntryForm = frappe.ui.form.QuickEntryForm.extend({
-	init: function(doctype, after_insert) {
+frappe.ui.form.CustomerQuickEntryForm = class CustomerQuickEntryForm extends frappe.ui.form.QuickEntryForm {
+	constructor(doctype, after_insert) {
+		super(doctype, after_insert);
 		this.skip_redirect_on_error = true;
-		this._super(doctype, after_insert);
-	},
+	}
 
-	render_dialog: function() {
+	render_dialog() {
 		this.mandatory = this.mandatory.concat(this.get_variant_fields());
-		this._super();
-	},
+		super.render_dialog();
+	}
 
-	get_variant_fields: function() {
+	get_variant_fields() {
 		var variant_fields = [{
 			fieldtype: "Section Break",
 			label: __("Primary Contact Details"),
@@ -77,5 +77,5 @@
 		}];
 
 		return variant_fields;
-	},
-})
\ No newline at end of file
+	}
+}
diff --git a/erpnext/public/js/utils/item_quick_entry.js b/erpnext/public/js/utils/item_quick_entry.js
index 27ef107..7e0198d 100644
--- a/erpnext/public/js/utils/item_quick_entry.js
+++ b/erpnext/public/js/utils/item_quick_entry.js
@@ -1,27 +1,27 @@
 frappe.provide('frappe.ui.form');
 
-frappe.ui.form.ItemQuickEntryForm = frappe.ui.form.QuickEntryForm.extend({
-	init: function(doctype, after_insert) {
-		this._super(doctype, after_insert);
-	},
+frappe.ui.form.ItemQuickEntryForm = class ItemQuickEntryForm extends frappe.ui.form.QuickEntryForm {
+	constructor(doctype, after_insert) {
+		super(doctype, after_insert);
+	}
 
-	render_dialog: function() {
+	render_dialog() {
 		this.mandatory = this.get_variant_fields().concat(this.mandatory);
 		this.mandatory = this.mandatory.concat(this.get_attributes_fields());
 		this.check_naming_series_based_on();
-		this._super();
+		super.render_dialog();
 		this.init_post_render_dialog_operations();
 		this.preset_fields_for_template();
 		this.dialog.$wrapper.find('.edit-full').text(__('Edit in full page for more options like assets, serial nos, batches etc.'))
-	},
+	}
 
-	check_naming_series_based_on: function() {
+	check_naming_series_based_on() {
 		if (frappe.defaults.get_default("item_naming_by") === "Naming Series") {
 			this.mandatory = this.mandatory.filter(d => d.fieldname !== "item_code");
 		}
-	},
+	}
 
-	init_post_render_dialog_operations: function() {
+	init_post_render_dialog_operations() {
 		this.dialog.fields_dict.attribute_html.$wrapper.append(frappe.render_template("item_quick_entry"));
 		this.init_for_create_variant_trigger();
 		this.init_for_item_template_trigger();
@@ -29,9 +29,9 @@
 		this.toggle_manufacturer_fields();
 		this.dialog.get_field("item_template").df.hidden = 1;
 		this.dialog.get_field("item_template").refresh();
-	},
+	}
 
-	register_primary_action: function() {
+	register_primary_action() {
 		var me = this;
 		this.dialog.set_primary_action(__('Save'), function() {
 			if (me.dialog.working) return;
@@ -59,9 +59,9 @@
 				me.insert(variant_values);
 			}
 		});
-	},
+	}
 
-	insert: function(variant_values) {
+	insert(variant_values) {
 		let me = this;
 		return new Promise(resolve => {
 			frappe.call({
@@ -94,9 +94,9 @@
 				freeze: true
 			});
 		});
-	},
+	}
 
-	open_doc: function() {
+	open_doc() {
 		this.dialog.hide();
 		this.update_doc();
 		if (this.dialog.fields_dict.create_variant.$input.prop("checked")) {
@@ -106,9 +106,9 @@
 		} else {
 			frappe.set_route('Form', this.doctype, this.doc.name);
 		}
-	},
+	}
 
-	get_variant_fields: function() {
+	get_variant_fields() {
 		var variant_fields = [{
 			fieldname: "create_variant",
 			fieldtype: "Check",
@@ -130,9 +130,9 @@
 		}];
 
 		return variant_fields;
-	},
+	}
 
-	get_manufacturing_fields: function() {
+	get_manufacturing_fields() {
 		this.manufacturer_fields = [{
 			fieldtype: 'Link',
 			options: 'Manufacturer',
@@ -148,9 +148,9 @@
 			reqd: 0
 		}];
 		return this.manufacturer_fields;
-	},
+	}
 
-	get_attributes_fields: function() {
+	get_attributes_fields() {
 		var attribute_fields = [{
 			fieldname: 'attribute_html',
 			fieldtype: 'HTML'
@@ -158,18 +158,18 @@
 
 		attribute_fields = attribute_fields.concat(this.get_manufacturing_fields());
 		return attribute_fields;
-	},
+	}
 
-	init_for_create_variant_trigger: function() {
+	init_for_create_variant_trigger() {
 		var me = this;
 
 		this.dialog.fields_dict.create_variant.$input.on("click", function() {
 			me.preset_fields_for_template();
 			me.init_post_template_trigger_operations(false, [], true);
 		});
-	},
+	}
 
-	preset_fields_for_template: function() {
+	preset_fields_for_template() {
 		var for_variant = this.dialog.get_value('create_variant');
 
 		// setup template field, seen and mandatory if variant
@@ -195,9 +195,9 @@
 			f.refresh();
 		});
 
-	},
+	}
 
-	init_for_item_template_trigger: function() {
+	init_for_item_template_trigger() {
 		var me = this;
 
 		me.dialog.fields_dict["item_template"].df.onchange = () => {
@@ -228,9 +228,9 @@
 				me.init_post_template_trigger_operations(false, [], true);
 			}
 		}
-	},
+	}
 
-	init_post_template_trigger_operations: function(is_manufacturer, attributes, attributes_flag) {
+	init_post_template_trigger_operations(is_manufacturer, attributes, attributes_flag) {
 		this.attributes = attributes;
 		this.attribute_values = {};
 		this.attributes_count = attributes.length;
@@ -240,23 +240,23 @@
 		this.toggle_manufacturer_fields();
 		this.dialog.fields_dict.attribute_html.$wrapper.find(".attributes").toggleClass("hide-control", attributes_flag);
 		this.dialog.fields_dict.attribute_html.$wrapper.find(".attributes-header").toggleClass("hide-control", attributes_flag);
-	},
+	}
 
-	toggle_manufacturer_fields: function() {
+	toggle_manufacturer_fields() {
 		var me = this;
 		$.each(this.manufacturer_fields, function(i, dialog_field) {
 			me.dialog.get_field(dialog_field.fieldname).df.hidden = !me.is_manufacturer;
 			me.dialog.get_field(dialog_field.fieldname).df.reqd = dialog_field.fieldname == 'manufacturer' ? me.is_manufacturer : false;
 			me.dialog.get_field(dialog_field.fieldname).refresh();
 		});
-	},
+	}
 
-	initiate_render_attributes: function() {
+	initiate_render_attributes() {
 		this.dialog.fields_dict.attribute_html.$wrapper.find(".attributes").empty();
 		this.render_attributes(this.attributes);
-	},
+	}
 
-	render_attributes: function(attributes) {
+	render_attributes(attributes) {
 		var me = this;
 
 		this.dialog.get_field('attribute_html').toggle(true);
@@ -291,9 +291,9 @@
 				});
 			}
 		});
-	},
+	}
 
-	init_make_control: function(fieldtype, row) {
+	init_make_control(fieldtype, row) {
 		this[row.attribute] = frappe.ui.form.make_control({
 			df: {
 				"fieldtype": fieldtype,
@@ -305,9 +305,9 @@
 			only_input: false
 		});
 		this[row.attribute].make_input();
-	},
+	}
 
-	init_awesomplete_for_attribute: function(row) {
+	init_awesomplete_for_attribute(row) {
 		var me = this;
 
 		this[row.attribute].input.awesomplete = new Awesomplete(this[row.attribute].input, {
@@ -343,9 +343,9 @@
 			me.attribute_values[$(e.target).attr("data-fieldname")] = e.target.value;
 			$(e.target).closest(".frappe-control").toggleClass("has-error", e.target.value ? false : true);
 		});
-	},
+	}
 
-	get_variant_doc: function() {
+	get_variant_doc() {
 		var me = this;
 		var variant_doc = {};
 		var attribute = this.validate_mandatory_attributes();
@@ -381,9 +381,9 @@
 			})
 		}
 		return variant_doc;
-	},
+	}
 
-	validate_mandatory_attributes: function() {
+	validate_mandatory_attributes() {
 		var me = this;
 		var attribute = {};
 		var mandatory = [];
@@ -404,4 +404,4 @@
 		}
 		return attribute;
 	}
-});
\ No newline at end of file
+};
diff --git a/erpnext/public/js/utils/item_selector.js b/erpnext/public/js/utils/item_selector.js
index d04c488..9fc2640 100644
--- a/erpnext/public/js/utils/item_selector.js
+++ b/erpnext/public/js/utils/item_selector.js
@@ -1,5 +1,5 @@
-erpnext.ItemSelector = Class.extend({
-	init: function(opts) {
+erpnext.ItemSelector = class ItemSelector {
+	constructor(opts) {
 		$.extend(this, opts);
 
 		if (!this.item_field) {
@@ -12,9 +12,9 @@
 
 		this.grid = this.frm.get_field("items").grid;
 		this.setup();
-	},
+	}
 
-	setup: function() {
+	setup() {
 		var me = this;
 		if(!this.grid.add_items_button) {
 			this.grid.add_items_button = this.grid.add_custom_button(__('Add Items'), function() {
@@ -26,9 +26,9 @@
 				setTimeout(function() { me.dialog.input.focus(); }, 1000);
 			});
 		}
-	},
+	}
 
-	make_dialog: function() {
+	make_dialog() {
 		this.dialog = new frappe.ui.Dialog({
 			title: __('Add Items')
 		});
@@ -53,9 +53,9 @@
 				me.timeout_id = undefined;
 			}, 500);
 		});
-	},
+	}
 
-	add_item: function(item_code) {
+	add_item(item_code) {
 		// add row or update qty
 		var added = false;
 
@@ -82,9 +82,9 @@
 			]);
 		}
 
-	},
+	}
 
-	render_items: function() {
+	render_items() {
 		let args = {
 			query: this.item_query,
 			filters: {}
@@ -107,4 +107,4 @@
 			me.dialog.results.html(frappe.render_template('item_selector', {'data':r.values}));
 		});
 	}
-});
\ No newline at end of file
+};
diff --git a/erpnext/public/js/utils/serial_no_batch_selector.js b/erpnext/public/js/utils/serial_no_batch_selector.js
index d49a813..d44c708 100644
--- a/erpnext/public/js/utils/serial_no_batch_selector.js
+++ b/erpnext/public/js/utils/serial_no_batch_selector.js
@@ -1,6 +1,6 @@
 
-erpnext.SerialNoBatchSelector = Class.extend({
-	init: function(opts, show_dialog) {
+erpnext.SerialNoBatchSelector = class SerialNoBatchSelector {
+	constructor(opts, show_dialog) {
 		$.extend(this, opts);
 		this.show_dialog = show_dialog;
 		// frm, item, warehouse_details, has_batch, oldest
@@ -12,16 +12,16 @@
 		if(d && d.has_serial_no && !(this.show_dialog == false)) this.has_serial_no = 1;
 
 		this.setup();
-	},
+	}
 
-	setup: function() {
+	setup() {
 		this.item_code = this.item.item_code;
 		this.qty = this.item.qty;
 		this.make_dialog();
 		this.on_close_dialog();
-	},
+	}
 
-	make_dialog: function() {
+	make_dialog() {
 		var me = this;
 
 		this.data = this.oldest ? this.oldest : [];
@@ -176,15 +176,15 @@
 		}
 
 		this.dialog.show();
-	},
+	}
 
-	on_close_dialog: function() {
+	on_close_dialog() {
 		this.dialog.get_close_btn().on('click', () => {
 			this.on_close && this.on_close(this.item);
 		});
-	},
+	}
 
-	validate: function() {
+	validate() {
 		let values = this.values;
 		if(!values.warehouse) {
 			frappe.throw(__("Please select a warehouse"));
@@ -210,7 +210,7 @@
 			}
 			return true;
 		}
-	},
+	}
 
 	update_batch_items() {
 		// clones an items if muliple batches are selected.
@@ -233,14 +233,14 @@
 					'selected_qty', this.values.warehouse);
 			});
 		}
-	},
+	}
 
 	update_serial_no_item() {
 		// just updates serial no for the item
 		if(this.has_serial_no && !this.has_batch) {
 			this.map_row_values(this.item, this.values, 'serial_no', 'qty');
 		}
-	},
+	}
 
 	update_batch_serial_no_items() {
 		// if serial no selected is from different batches, adds new rows for each batch.
@@ -281,14 +281,14 @@
 				});
 			})
 		}
-	},
+	}
 
-	batch_exists: function(batch) {
+	batch_exists(batch) {
 		const batches = this.frm.doc.items.map(data => data.batch_no);
 		return (batches && in_list(batches, batch)) ? true : false;
-	},
+	}
 
-	map_row_values: function(row, values, number, qty_field, warehouse) {
+	map_row_values(row, values, number, qty_field, warehouse) {
 		row.qty = values[qty_field];
 		row.transfer_qty = flt(values[qty_field]) * flt(row.conversion_factor);
 		row[number] = values[number];
@@ -301,9 +301,9 @@
 		}
 
 		this.frm.dirty();
-	},
+	}
 
-	update_total_qty: function() {
+	update_total_qty() {
 		let qty_field = this.dialog.fields_dict.qty;
 		let total_qty = 0;
 
@@ -312,9 +312,9 @@
 		});
 
 		qty_field.set_input(total_qty);
-	},
+	}
 
-	get_batch_fields: function() {
+	get_batch_fields() {
 		var me = this;
 
 		return [
@@ -425,9 +425,9 @@
 				},
 			}
 		];
-	},
+	}
 
-	get_serial_no_fields: function() {
+	get_serial_no_fields() {
 		var me = this;
 		this.serial_list = [];
 
@@ -510,4 +510,4 @@
 			}
 		];
 	}
-});
+};
diff --git a/erpnext/selling/doctype/installation_note/installation_note.js b/erpnext/selling/doctype/installation_note/installation_note.js
index 7fd0877..ffa185b 100644
--- a/erpnext/selling/doctype/installation_note/installation_note.js
+++ b/erpnext/selling/doctype/installation_note/installation_note.js
@@ -30,8 +30,8 @@
 frappe.provide("erpnext.selling");
 
 // TODO commonify this code
-erpnext.selling.InstallationNote = frappe.ui.form.Controller.extend({
-	refresh: function() {
+erpnext.selling.InstallationNote = class InstallationNote extends frappe.ui.form.Controller {
+	refresh() {
 		var me = this;
 		if (this.frm.doc.docstatus===0) {
 			this.frm.add_custom_button(__('From Delivery Note'),
@@ -54,7 +54,7 @@
 				}, "fa fa-download", "btn-default"
 			);
 		}
-	},
-});
+	}
+};
 
 $.extend(cur_frm.cscript, new erpnext.selling.InstallationNote({frm: cur_frm}));
\ No newline at end of file
diff --git a/erpnext/selling/doctype/quotation/quotation.js b/erpnext/selling/doctype/quotation/quotation.js
index 5a0d9c9..10606bf 100644
--- a/erpnext/selling/doctype/quotation/quotation.js
+++ b/erpnext/selling/doctype/quotation/quotation.js
@@ -36,13 +36,13 @@
 	}
 });
 
-erpnext.selling.QuotationController = erpnext.selling.SellingController.extend({
-	onload: function(doc, dt, dn) {
+erpnext.selling.QuotationController = class QuotationController extends erpnext.selling.SellingController {
+	onload(doc, dt, dn) {
 		var me = this;
-		this._super(doc, dt, dn);
+		super.(doc, dt, dn);
 
-	},
-	party_name: function() {
+	}
+	party_name() {
 		var me = this;
 		erpnext.utils.get_party_details(this.frm, null, null, function() {
 			me.apply_price_list();
@@ -51,9 +51,9 @@
 		if(me.frm.doc.quotation_to=="Lead" && me.frm.doc.party_name) {
 			me.frm.trigger("get_lead_details");
 		}
-	},
-	refresh: function(doc, dt, dn) {
-		this._super(doc, dt, dn);
+	}
+	refresh(doc, dt, dn) {
+		super.refresh(doc, dt, dn);
 		doctype = doc.quotation_to == 'Customer' ? 'Customer':'Lead';
 		frappe.dynamic_link = {doc: this.frm.doc, fieldname: 'party_name', doctype: doctype}
 
@@ -121,9 +121,9 @@
 
 		this.toggle_reqd_lead_customer();
 
-	},
+	}
 
-	set_dynamic_field_label: function(){
+	set_dynamic_field_label(){
 		if (this.frm.doc.quotation_to == "Customer")
 		{
 			this.frm.set_df_property("party_name", "label", "Customer");
@@ -138,22 +138,22 @@
 				return{	query: "erpnext.controllers.queries.lead_query" }
 			}
 		}
-	},
+	}
 
-	toggle_reqd_lead_customer: function() {
+	toggle_reqd_lead_customer() {
 		var me = this;
 
 		// to overwrite the customer_filter trigger from queries.js
 		this.frm.toggle_reqd("party_name", this.frm.doc.quotation_to);
 		this.frm.set_query('customer_address', this.address_query);
 		this.frm.set_query('shipping_address_name', this.address_query);
-	},
+	}
 
-	tc_name: function() {
+	tc_name() {
 		this.get_terms();
-	},
+	}
 
-	address_query: function(doc) {
+	address_query(doc) {
 		return {
 			query: 'frappe.contacts.doctype.address.address.address_query',
 			filters: {
@@ -161,20 +161,20 @@
 				link_name: doc.party_name
 			}
 		};
-	},
+	}
 
-	validate_company_and_party: function(party_field) {
+	validate_company_and_party(party_field) {
 		if(!this.frm.doc.quotation_to) {
 			frappe.msgprint(__("Please select a value for {0} quotation_to {1}", [this.frm.doc.doctype, this.frm.doc.name]));
 			return false;
 		} else if (this.frm.doc.quotation_to == "Lead") {
 			return true;
 		} else {
-			return this._super(party_field);
+			return super.validate_company_and_party(party_field);
 		}
-	},
+	}
 
-	get_lead_details: function() {
+	get_lead_details() {
 		var me = this;
 		if(!this.frm.doc.quotation_to === "Lead") {
 			return;
@@ -198,7 +198,7 @@
 			}
 		})
 	}
-});
+};
 
 cur_frm.script_manager.make(erpnext.selling.QuotationController);
 
diff --git a/erpnext/selling/doctype/sales_order/sales_order.js b/erpnext/selling/doctype/sales_order/sales_order.js
index e3b41e6..d5ceca8 100644
--- a/erpnext/selling/doctype/sales_order/sales_order.js
+++ b/erpnext/selling/doctype/sales_order/sales_order.js
@@ -102,14 +102,14 @@
 	}
 });
 
-erpnext.selling.SalesOrderController = erpnext.selling.SellingController.extend({
-	onload: function(doc, dt, dn) {
-		this._super();
-	},
+erpnext.selling.SalesOrderController = class SalesOrderController extends erpnext.selling.SellingController {
+	onload(doc, dt, dn) {
+		super.onload();
+	}
 
-	refresh: function(doc, dt, dn) {
+	refresh(doc, dt, dn) {
 		var me = this;
-		this._super();
+		super.refresh();
 		let allow_delivery = false;
 
 		if (doc.docstatus==1) {
@@ -241,14 +241,14 @@
 		}
 
 		this.order_type(doc);
-	},
+	}
 
 	create_pick_list() {
 		frappe.model.open_mapped_doc({
 			method: "erpnext.selling.doctype.sales_order.sales_order.create_pick_list",
 			frm: this.frm
 		})
-	},
+	}
 
 	make_work_order() {
 		var me = this;
@@ -343,33 +343,33 @@
 				}
 			}
 		});
-	},
+	}
 
-	order_type: function() {
+	order_type() {
 		this.toggle_delivery_date();
-	},
+	}
 
-	tc_name: function() {
+	tc_name() {
 		this.get_terms();
-	},
+	}
 
-	make_material_request: function() {
+	make_material_request() {
 		frappe.model.open_mapped_doc({
 			method: "erpnext.selling.doctype.sales_order.sales_order.make_material_request",
 			frm: this.frm
 		})
-	},
+	}
 
-	skip_delivery_note: function() {
+	skip_delivery_note() {
 		this.toggle_delivery_date();
-	},
+	}
 
-	toggle_delivery_date: function() {
+	toggle_delivery_date() {
 		this.frm.fields_dict.items.grid.toggle_reqd("delivery_date",
 			(this.frm.doc.order_type == "Sales" && !this.frm.doc.skip_delivery_note));
-	},
+	}
 
-	make_raw_material_request: function() {
+	make_raw_material_request() {
 		var me = this;
 		this.frm.call({
 			doc: this.frm.doc,
@@ -390,9 +390,9 @@
 				}
 			}
 		});
-	},
+	}
 
-	make_raw_material_request_dialog: function(r) {
+	make_raw_material_request_dialog(r) {
 		var fields = [
 			{fieldtype:'Check', fieldname:'include_exploded_items',
 				label: __('Include Exploded Items')},
@@ -447,9 +447,9 @@
 			primary_action_label: __('Create')
 		});
 		d.show();
-	},
+	}
 
-	make_delivery_note_based_on_delivery_date: function() {
+	make_delivery_note_based_on_delivery_date() {
 		var me = this;
 
 		var delivery_dates = [];
@@ -509,51 +509,51 @@
 		} else {
 			this.make_delivery_note();
 		}
-	},
+	}
 
-	make_delivery_note: function() {
+	make_delivery_note() {
 		frappe.model.open_mapped_doc({
 			method: "erpnext.selling.doctype.sales_order.sales_order.make_delivery_note",
 			frm: this.frm
 		})
-	},
+	}
 
-	make_sales_invoice: function() {
+	make_sales_invoice() {
 		frappe.model.open_mapped_doc({
 			method: "erpnext.selling.doctype.sales_order.sales_order.make_sales_invoice",
 			frm: this.frm
 		})
-	},
+	}
 
-	make_maintenance_schedule: function() {
+	make_maintenance_schedule() {
 		frappe.model.open_mapped_doc({
 			method: "erpnext.selling.doctype.sales_order.sales_order.make_maintenance_schedule",
 			frm: this.frm
 		})
-	},
+	}
 
-	make_project: function() {
+	make_project() {
 		frappe.model.open_mapped_doc({
 			method: "erpnext.selling.doctype.sales_order.sales_order.make_project",
 			frm: this.frm
 		})
-	},
+	}
 
-	make_inter_company_order: function() {
+	make_inter_company_order() {
 		frappe.model.open_mapped_doc({
 			method: "erpnext.selling.doctype.sales_order.sales_order.make_inter_company_purchase_order",
 			frm: this.frm
 		});
-	},
+	}
 
-	make_maintenance_visit: function() {
+	make_maintenance_visit() {
 		frappe.model.open_mapped_doc({
 			method: "erpnext.selling.doctype.sales_order.sales_order.make_maintenance_visit",
 			frm: this.frm
 		})
-	},
+	}
 
-	make_purchase_order: function(){
+	make_purchase_order(){
 		let pending_items = this.frm.doc.items.some((item) =>{
 			let pending_qty = flt(item.stock_qty) - flt(item.ordered_qty);
 			return pending_qty > 0;
@@ -690,9 +690,9 @@
 		dialog.get_field("items_for_po").refresh();
 		dialog.wrapper.find('.grid-heading-row .grid-row-check').click();
 		dialog.show();
-	},
+	}
 
-	hold_sales_order: function(){
+	hold_sales_order(){
 		var me = this;
 		var d = new frappe.ui.Dialog({
 			title: __('Reason for Hold'),
@@ -724,11 +724,11 @@
 			}
 		});
 		d.show();
-	},
-	close_sales_order: function(){
+	}
+	close_sales_order(){
 		this.frm.cscript.update_status("Close", "Closed")
-	},
-	update_status: function(label, status){
+	}
+	update_status(label, status){
 		var doc = this.frm.doc;
 		var me = this;
 		frappe.ui.form.is_saving = true;
@@ -743,5 +743,5 @@
 			}
 		});
 	}
-});
+};
 $.extend(cur_frm.cscript, new erpnext.selling.SalesOrderController({frm: cur_frm}));
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)) {
diff --git a/erpnext/stock/dashboard/item_dashboard.js b/erpnext/stock/dashboard/item_dashboard.js
index 95cb92b..30e0b76 100644
--- a/erpnext/stock/dashboard/item_dashboard.js
+++ b/erpnext/stock/dashboard/item_dashboard.js
@@ -1,11 +1,11 @@
 frappe.provide('erpnext.stock');
 
-erpnext.stock.ItemDashboard = Class.extend({
-	init: function(opts) {
+erpnext.stock.ItemDashboard = class ItemDashboard {
+	constructor(opts) {
 		$.extend(this, opts);
 		this.make();
-	},
-	make: function() {
+	}
+	make() {
 		var me = this;
 		this.start = 0;
 		if(!this.sort_by) {
@@ -73,8 +73,8 @@
 			me.refresh();
 		});
 
-	},
-	refresh: function() {
+	}
+	refresh() {
 		if(this.before_refresh) {
 			this.before_refresh();
 		}
@@ -98,8 +98,8 @@
 				me.render(r.message);
 			}
 		});
-	},
-	render: function(data) {
+	}
+	render(data) {
 		if (this.start===0) {
 			this.max_count = 0;
 			this.result.empty();
@@ -135,9 +135,9 @@
 			$(`<div class='text-muted' style='margin: 20px 5px;'>
 				${message} </div>`).appendTo(this.result);
 		}
-	},
+	}
 
-	get_item_dashboard_data: function(data, max_count, show_item) {
+	get_item_dashboard_data(data, max_count, show_item) {
 		if(!max_count) max_count = 0;
 		if(!data) data = [];
 
@@ -164,9 +164,9 @@
 			can_write:can_write,
 			show_item: show_item || false
 		};
-	},
+	}
 
-	get_capacity_dashboard_data: function(data) {
+	get_capacity_dashboard_data(data) {
 		if (!data) data = [];
 
 		data.forEach(function(d) {
@@ -183,7 +183,7 @@
 			can_write: can_write,
 		};
 	}
-});
+};
 
 erpnext.stock.move_item = function(item, source, target, actual_qty, rate, callback) {
 	var dialog = new frappe.ui.Dialog({
diff --git a/erpnext/stock/doctype/delivery_note/delivery_note.js b/erpnext/stock/doctype/delivery_note/delivery_note.js
index 334bdea..63ea198 100644
--- a/erpnext/stock/doctype/delivery_note/delivery_note.js
+++ b/erpnext/stock/doctype/delivery_note/delivery_note.js
@@ -123,17 +123,17 @@
 	}
 });
 
-erpnext.stock.DeliveryNoteController = erpnext.selling.SellingController.extend({
-	setup: function(doc) {
+erpnext.stock.DeliveryNoteController = class DeliveryNoteController extends erpnext.selling.SellingController {
+	setup(doc) {
 		this.setup_posting_date_time_check();
-		this._super(doc);
+		super.setup(doc);
 		this.frm.make_methods = {
 			'Delivery Trip': this.make_delivery_trip,
 		};
-	},
-	refresh: function(doc, dt, dn) {
+	}
+	refresh(doc, dt, dn) {
 		var me = this;
-		this._super();
+		super.refresh();
 		if ((!doc.is_return) && (doc.status!="Closed" || this.frm.is_new())) {
 			if (this.frm.doc.docstatus===0) {
 				this.frm.add_custom_button(__('Sales Order'),
@@ -231,64 +231,64 @@
 				erpnext.utils.make_subscription(doc.doctype, doc.name)
 			}, __('Create'))
 		}
-	},
+	}
 
-	make_shipment: function() {
+	make_shipment() {
 		frappe.model.open_mapped_doc({
 			method: "erpnext.stock.doctype.delivery_note.delivery_note.make_shipment",
 			frm: this.frm
 		})
-	},
+	}
 
-	make_sales_invoice: function() {
+	make_sales_invoice() {
 		frappe.model.open_mapped_doc({
 			method: "erpnext.stock.doctype.delivery_note.delivery_note.make_sales_invoice",
 			frm: this.frm
 		})
-	},
+	}
 
-	make_installation_note: function() {
+	make_installation_note() {
 		frappe.model.open_mapped_doc({
 			method: "erpnext.stock.doctype.delivery_note.delivery_note.make_installation_note",
 			frm: this.frm
 		});
-	},
+	}
 
-	make_sales_return: function() {
+	make_sales_return() {
 		frappe.model.open_mapped_doc({
 			method: "erpnext.stock.doctype.delivery_note.delivery_note.make_sales_return",
 			frm: this.frm
 		})
-	},
+	}
 
-	make_delivery_trip: function() {
+	make_delivery_trip() {
 		frappe.model.open_mapped_doc({
 			method: "erpnext.stock.doctype.delivery_note.delivery_note.make_delivery_trip",
 			frm: cur_frm
 		})
-	},
+	}
 
-	tc_name: function() {
+	tc_name() {
 		this.get_terms();
-	},
+	}
 
-	items_on_form_rendered: function(doc, grid_row) {
+	items_on_form_rendered(doc, grid_row) {
 		erpnext.setup_serial_no();
-	},
+	}
 
-	packed_items_on_form_rendered: function(doc, grid_row) {
+	packed_items_on_form_rendered(doc, grid_row) {
 		erpnext.setup_serial_no();
-	},
+	}
 
-	close_delivery_note: function(doc){
+	close_delivery_note(doc){
 		this.update_status("Closed")
-	},
+	}
 
-	reopen_delivery_note : function() {
+	reopen_delivery_note() {
 		this.update_status("Submitted")
-	},
+	}
 
-	update_status: function(status) {
+	update_status(status) {
 		var me = this;
 		frappe.ui.form.is_saving = true;
 		frappe.call({
@@ -302,8 +302,8 @@
 				frappe.ui.form.is_saving = false;
 			}
 		})
-	},
-});
+	}
+};
 
 $.extend(cur_frm.cscript, new erpnext.stock.DeliveryNoteController({frm: cur_frm}));
 
diff --git a/erpnext/stock/doctype/landed_cost_voucher/landed_cost_voucher.js b/erpnext/stock/doctype/landed_cost_voucher/landed_cost_voucher.js
index 1abbc35..433f78a 100644
--- a/erpnext/stock/doctype/landed_cost_voucher/landed_cost_voucher.js
+++ b/erpnext/stock/doctype/landed_cost_voucher/landed_cost_voucher.js
@@ -5,8 +5,8 @@
 
 frappe.provide("erpnext.stock");
 
-erpnext.stock.LandedCostVoucher = erpnext.stock.StockController.extend({
-	setup: function() {
+erpnext.stock.LandedCostVoucher = class LandedCostVoucher extends erpnext.stock.StockController {
+	setup() {
 		var me = this;
 		this.frm.fields_dict.purchase_receipts.grid.get_field('receipt_document').get_query =
 			function (doc, cdt, cdn) {
@@ -30,9 +30,9 @@
 		this.frm.add_fetch("receipt_document", "supplier", "supplier");
 		this.frm.add_fetch("receipt_document", "posting_date", "posting_date");
 		this.frm.add_fetch("receipt_document", "base_grand_total", "grand_total");
-	},
+	}
 
-	refresh: function() {
+	refresh() {
 		var help_content =
 			`<br><br>
 			<table class="table table-bordered" style="background-color: #f9f9f9;">
@@ -67,9 +67,9 @@
 			let company_currency = frappe.get_doc(":Company", this.frm.doc.company).default_currency;
 			this.frm.set_currency_labels(["total_taxes_and_charges"], company_currency);
 		}
-	},
+	}
 
-	get_items_from_purchase_receipts: function() {
+	get_items_from_purchase_receipts() {
 		var me = this;
 		if(!this.frm.doc.purchase_receipts.length) {
 			frappe.msgprint(__("Please enter Purchase Receipt first"));
@@ -82,22 +82,22 @@
 				}
 			});
 		}
-	},
+	}
 
-	amount: function(frm) {
+	amount(frm) {
 		this.set_total_taxes_and_charges();
 		this.set_applicable_charges_for_item();
-	},
+	}
 
-	set_total_taxes_and_charges: function() {
+	set_total_taxes_and_charges() {
 		var total_taxes_and_charges = 0.0;
 		$.each(this.frm.doc.taxes || [], function(i, d) {
 			total_taxes_and_charges += flt(d.base_amount);
 		});
 		this.frm.set_value("total_taxes_and_charges", total_taxes_and_charges);
-	},
+	}
 
-	set_applicable_charges_for_item: function() {
+	set_applicable_charges_for_item() {
 		var me = this;
 
 		if(this.frm.doc.taxes.length) {
@@ -123,15 +123,15 @@
 				refresh_field("items");
 			}
 		}
-	},
-	distribute_charges_based_on: function (frm) {
+	}
+	distribute_charges_based_on (frm) {
 		this.set_applicable_charges_for_item();
-	},
+	}
 
-	items_remove: () => {
+	items_remove() {
 		this.trigger('set_applicable_charges_for_item');
 	}
-});
+};
 
 cur_frm.script_manager.make(erpnext.stock.LandedCostVoucher);
 
diff --git a/erpnext/stock/doctype/material_request/material_request.js b/erpnext/stock/doctype/material_request/material_request.js
index 527b0d3..86936b4 100644
--- a/erpnext/stock/doctype/material_request/material_request.js
+++ b/erpnext/stock/doctype/material_request/material_request.js
@@ -403,28 +403,28 @@
 	}
 });
 
-erpnext.buying.MaterialRequestController = erpnext.buying.BuyingController.extend({
-	tc_name: function() {
+erpnext.buying.MaterialRequestController = class MaterialRequestController extends erpnext.buying.BuyingController {
+	tc_name() {
 		this.get_terms();
-	},
+	}
 
-	item_code: function() {
+	item_code() {
 		// to override item code trigger from transaction.js
-	},
+	}
 
-	validate_company_and_party: function() {
+	validate_company_and_party() {
 		return true;
-	},
+	}
 
-	calculate_taxes_and_totals: function() {
+	calculate_taxes_and_totals() {
 		return;
-	},
+	}
 
-	validate: function() {
+	validate() {
 		set_schedule_date(this.frm);
-	},
+	}
 
-	onload: function(doc, cdt, cdn) {
+	onload(doc, cdt, cdn) {
 		this.frm.set_query("item_code", "items", function() {
 			if (doc.material_request_type == "Customer Provided") {
 				return{
@@ -438,9 +438,9 @@
 				}
 			}
 		});
-	},
+	}
 
-	items_add: function(doc, cdt, cdn) {
+	items_add(doc, cdt, cdn) {
 		var row = frappe.get_doc(cdt, cdn);
 		if(doc.schedule_date) {
 			row.schedule_date = doc.schedule_date;
@@ -448,16 +448,16 @@
 		} else {
 			this.frm.script_manager.copy_from_first_row("items", row, ["schedule_date"]);
 		}
-	},
+	}
 
-	items_on_form_rendered: function() {
-		set_schedule_date(this.frm);
-	},
-
-	schedule_date: function() {
+	items_on_form_rendered() {
 		set_schedule_date(this.frm);
 	}
-});
+
+	schedule_date() {
+		set_schedule_date(this.frm);
+	}
+};
 
 // for backward compatibility: combine new and previous states
 $.extend(cur_frm.cscript, new erpnext.buying.MaterialRequestController({frm: cur_frm}));
diff --git a/erpnext/stock/doctype/purchase_receipt/purchase_receipt.js b/erpnext/stock/doctype/purchase_receipt/purchase_receipt.js
index 57cc350..f87b273 100644
--- a/erpnext/stock/doctype/purchase_receipt/purchase_receipt.js
+++ b/erpnext/stock/doctype/purchase_receipt/purchase_receipt.js
@@ -86,15 +86,15 @@
 	}
 });
 
-erpnext.stock.PurchaseReceiptController = erpnext.buying.BuyingController.extend({
-	setup: function(doc) {
+erpnext.stock.PurchaseReceiptController = class PurchaseReceiptController extends erpnext.buying.BuyingController {
+	setup(doc) {
 		this.setup_posting_date_time_check();
-		this._super(doc);
-	},
+		super.setup(doc);
+	}
 
-	refresh: function() {
+	refresh() {
 		var me = this;
-		this._super();
+		super.refresh();
 		if(this.frm.doc.docstatus > 0) {
 			this.show_stock_ledger();
 			//removed for temporary
@@ -173,31 +173,31 @@
 		}
 
 		this.frm.toggle_reqd("supplier_warehouse", this.frm.doc.is_subcontracted==="Yes");
-	},
+	}
 
-	make_purchase_invoice: function() {
+	make_purchase_invoice() {
 		frappe.model.open_mapped_doc({
 			method: "erpnext.stock.doctype.purchase_receipt.purchase_receipt.make_purchase_invoice",
 			frm: cur_frm
 		})
-	},
+	}
 
-	make_purchase_return: function() {
+	make_purchase_return() {
 		frappe.model.open_mapped_doc({
 			method: "erpnext.stock.doctype.purchase_receipt.purchase_receipt.make_purchase_return",
 			frm: cur_frm
 		})
-	},
+	}
 
-	close_purchase_receipt: function() {
+	close_purchase_receipt() {
 		cur_frm.cscript.update_status("Closed");
-	},
+	}
 
-	reopen_purchase_receipt: function() {
+	reopen_purchase_receipt() {
 		cur_frm.cscript.update_status("Submitted");
-	},
+	}
 
-	make_retention_stock_entry: function() {
+	make_retention_stock_entry() {
 		frappe.call({
 			method: "erpnext.stock.doctype.stock_entry.stock_entry.move_sample_to_retention_warehouse",
 			args:{
@@ -214,13 +214,13 @@
 				}
 			}
 		});
-	},
+	}
 
-	apply_putaway_rule: function() {
+	apply_putaway_rule() {
 		if (this.frm.doc.apply_putaway_rule) erpnext.apply_putaway_rule(this.frm);
 	}
 
-});
+};
 
 // for backward compatibility: combine new and previous states
 $.extend(cur_frm.cscript, new erpnext.stock.PurchaseReceiptController({frm: cur_frm}));
diff --git a/erpnext/stock/doctype/stock_entry/stock_entry.js b/erpnext/stock/doctype/stock_entry/stock_entry.js
index 64dcbed..16e7463 100644
--- a/erpnext/stock/doctype/stock_entry/stock_entry.js
+++ b/erpnext/stock/doctype/stock_entry/stock_entry.js
@@ -777,8 +777,8 @@
 	}
 });
 
-erpnext.stock.StockEntry = erpnext.stock.StockController.extend({
-	setup: function() {
+erpnext.stock.StockEntry = class StockEntry extends erpnext.stock.StockController {
+	setup() {
 		var me = this;
 
 		this.setup_posting_date_time_check();
@@ -825,9 +825,9 @@
 
 		frappe.dynamic_link = { doc: this.frm.doc, fieldname: 'supplier', doctype: 'Supplier' }
 		this.frm.set_query("supplier_address", erpnext.queries.address_query)
-	},
+	}
 
-	onload_post_render: function() {
+	onload_post_render() {
 		var me = this;
 		this.set_default_account(function() {
 			if(me.frm.doc.__islocal && me.frm.doc.company && !me.frm.doc.amended_from) {
@@ -836,9 +836,9 @@
 		});
 
 		this.frm.get_field("items").grid.set_multiple_add("item_code", "qty");
-	},
+	}
 
-	refresh: function() {
+	refresh() {
 		var me = this;
 		erpnext.toggle_naming_series();
 		this.toggle_related_fields(this.frm.doc);
@@ -850,22 +850,22 @@
 		erpnext.hide_company();
 		erpnext.utils.add_item(this.frm);
 		this.frm.trigger('add_to_transit');
-	},
+	}
 
-	scan_barcode: function() {
+	scan_barcode() {
 		let transaction_controller= new erpnext.TransactionController({frm:this.frm});
 		transaction_controller.scan_barcode();
-	},
+	}
 
-	on_submit: function() {
+	on_submit() {
 		this.clean_up();
-	},
+	}
 
-	after_cancel: function() {
+	after_cancel() {
 		this.clean_up();
-	},
+	}
 
-	set_default_account: function(callback) {
+	set_default_account(callback) {
 		var me = this;
 
 		if(this.frm.doc.company && erpnext.is_perpetual_inventory_enabled(this.frm.doc.company)) {
@@ -885,9 +885,9 @@
 				}
 			});
 		}
-	},
+	}
 
-	clean_up: function() {
+	clean_up() {
 		// Clear Work Order record from locals, because it is updated via Stock Entry
 		if(this.frm.doc.work_order &&
 			in_list(["Manufacture", "Material Transfer for Manufacture", "Material Consumption for Manufacture"],
@@ -895,13 +895,13 @@
 			frappe.model.remove_from_locals("Work Order",
 				this.frm.doc.work_order);
 		}
-	},
+	}
 
-	fg_completed_qty: function() {
+	fg_completed_qty() {
 		this.get_items();
-	},
+	}
 
-	get_items: function() {
+	get_items() {
 		var me = this;
 		if(!this.frm.doc.fg_completed_qty || !this.frm.doc.bom_no)
 			frappe.throw(__("BOM and Manufacturing Quantity are required"));
@@ -917,9 +917,9 @@
 				}
 			});
 		}
-	},
+	}
 
-	work_order: function() {
+	work_order() {
 		var me = this;
 		this.toggle_enable_bom();
 		if(!me.frm.doc.work_order || me.frm.doc.job_card) {
@@ -952,13 +952,13 @@
 				}
 			}
 		});
-	},
+	}
 
-	toggle_enable_bom: function() {
+	toggle_enable_bom() {
 		this.frm.toggle_enable("bom_no", !!!this.frm.doc.work_order);
-	},
+	}
 
-	add_excise_button: function() {
+	add_excise_button() {
 		if(frappe.boot.sysdefaults.country === "India")
 			this.frm.add_custom_button(__("Excise Invoice"), function() {
 				var excise = frappe.model.make_new_doc_and_get_name('Journal Entry');
@@ -966,35 +966,35 @@
 				excise.voucher_type = 'Excise Entry';
 				frappe.set_route('Form', 'Journal Entry', excise.name);
 			}, __('Create'));
-	},
+	}
 
-	items_add: function(doc, cdt, cdn) {
+	items_add(doc, cdt, cdn) {
 		var row = frappe.get_doc(cdt, cdn);
 		this.frm.script_manager.copy_from_first_row("items", row, ["expense_account", "cost_center"]);
 
 		if(!row.s_warehouse) row.s_warehouse = this.frm.doc.from_warehouse;
 		if(!row.t_warehouse) row.t_warehouse = this.frm.doc.to_warehouse;
-	},
+	}
 
-	from_warehouse: function(doc) {
+	from_warehouse(doc) {
 		this.frm.trigger('set_tansit_warehouse');
 		this.set_warehouse_in_children(doc.items, "s_warehouse", doc.from_warehouse);
-	},
+	}
 
-	to_warehouse: function(doc) {
+	to_warehouse(doc) {
 		this.set_warehouse_in_children(doc.items, "t_warehouse", doc.to_warehouse);
-	},
+	}
 
-	set_warehouse_in_children: function(child_table, warehouse_field, warehouse) {
+	set_warehouse_in_children(child_table, warehouse_field, warehouse) {
 		let transaction_controller = new erpnext.TransactionController();
 		transaction_controller.autofill_warehouse(child_table, warehouse_field, warehouse);
-	},
+	}
 
-	items_on_form_rendered: function(doc, grid_row) {
+	items_on_form_rendered(doc, grid_row) {
 		erpnext.setup_serial_no();
-	},
+	}
 
-	toggle_related_fields: function(doc) {
+	toggle_related_fields(doc) {
 		this.frm.toggle_enable("from_warehouse", doc.purpose!='Material Receipt');
 		this.frm.toggle_enable("to_warehouse", doc.purpose!='Material Issue');
 
@@ -1021,12 +1021,12 @@
 			doc.purpose!='Material Issue');
 
 		this.frm.fields_dict["items"].grid.set_column_disp("additional_cost", doc.purpose!='Material Issue');
-	},
+	}
 
-	supplier: function(doc) {
+	supplier(doc) {
 		erpnext.utils.get_party_details(this.frm, null, null, null);
 	}
-});
+};
 
 erpnext.stock.select_batch_and_serial_no = (frm, item) => {
 	let get_warehouse_type_and_name = (item) => {
diff --git a/erpnext/stock/doctype/stock_reconciliation/stock_reconciliation.js b/erpnext/stock/doctype/stock_reconciliation/stock_reconciliation.js
index ac4ed5e..3badc7e 100644
--- a/erpnext/stock/doctype/stock_reconciliation/stock_reconciliation.js
+++ b/erpnext/stock/doctype/stock_reconciliation/stock_reconciliation.js
@@ -220,8 +220,8 @@
 
 });
 
-erpnext.stock.StockReconciliation = erpnext.stock.StockController.extend({
-	setup: function() {
+erpnext.stock.StockReconciliation = class StockReconciliation extends erpnext.stock.StockController {
+	setup() {
 		var me = this;
 
 		this.setup_posting_date_time_check();
@@ -249,17 +249,17 @@
 				}
 			}
 		}
-	},
+	}
 
-	refresh: function() {
+	refresh() {
 		if(this.frm.doc.docstatus > 0) {
 			this.show_stock_ledger();
 			if (erpnext.is_perpetual_inventory_enabled(this.frm.doc.company)) {
 				this.show_general_ledger();
 			}
 		}
-	},
+	}
 
-});
+};
 
 cur_frm.cscript = new erpnext.stock.StockReconciliation({frm: cur_frm});
diff --git a/erpnext/support/doctype/warranty_claim/warranty_claim.js b/erpnext/support/doctype/warranty_claim/warranty_claim.js
index 79f4675..c9aa41f 100644
--- a/erpnext/support/doctype/warranty_claim/warranty_claim.js
+++ b/erpnext/support/doctype/warranty_claim/warranty_claim.js
@@ -36,8 +36,8 @@
 	}
 });
 
-erpnext.support.WarrantyClaim = frappe.ui.form.Controller.extend({
-	refresh: function() {
+erpnext.support.WarrantyClaim = class WarrantyClaim extends frappe.ui.form.Controller {
+	refresh() {
 		frappe.dynamic_link = {doc: this.frm.doc, fieldname: 'customer', doctype: 'Customer'}
 
 		if(!cur_frm.doc.__islocal &&
@@ -45,15 +45,15 @@
 			cur_frm.add_custom_button(__('Maintenance Visit'),
 				this.make_maintenance_visit);
 		}
-	},
+	}
 
-	make_maintenance_visit: function() {
+	make_maintenance_visit() {
 		frappe.model.open_mapped_doc({
 			method: "erpnext.support.doctype.warranty_claim.warranty_claim.make_maintenance_visit",
 			frm: cur_frm
 		})
 	}
-});
+};
 
 $.extend(cur_frm.cscript, new erpnext.support.WarrantyClaim({frm: cur_frm}));
 
diff --git a/erpnext/templates/includes/rfq.js b/erpnext/templates/includes/rfq.js
index b56c416..37beb5a 100644
--- a/erpnext/templates/includes/rfq.js
+++ b/erpnext/templates/includes/rfq.js
@@ -11,23 +11,23 @@
 	doc.buying_price_list = "{{ doc.buying_price_list }}"
 });
 
-rfq = Class.extend({
-	init: function(){
+rfq = class rfq {
+	constructor(){
 		this.onfocus_select_all();
 		this.change_qty();
 		this.change_rate();
 		this.terms();
 		this.submit_rfq();
 		this.navigate_quotations();
-	},
+	}
 
-	onfocus_select_all: function(){
+	onfocus_select_all(){
 		$("input").click(function(){
 			$(this).select();
 		})
-	},
+	}
 
-	change_qty: function(){
+	change_qty(){
 		var me = this;
 		$('.rfq-items').on("change", ".rfq-qty", function(){
 			me.idx = parseFloat($(this).attr('data-idx'));
@@ -36,9 +36,9 @@
 			me.update_qty_rate();
 			$(this).val(format_number(me.qty, doc.number_format, 2));
 		})
-	},
+	}
 
-	change_rate: function(){
+	change_rate(){
 		var me = this;
 		$(".rfq-items").on("change", ".rfq-rate", function(){
 			me.idx = parseFloat($(this).attr('data-idx'));
@@ -47,15 +47,15 @@
 			me.update_qty_rate();
 			$(this).val(format_number(me.rate, doc.number_format, 2));
 		})
-	},
+	}
 
-	terms: function(){
+	terms(){
 		$(".terms").on("change", ".terms-feedback", function(){
 			doc.terms = $(this).val();
 		})
-	},
+	}
 
-	update_qty_rate: function(){
+	update_qty_rate(){
 		var me = this;
 		doc.grand_total = 0.0;
 		$.each(doc.items, function(idx, data){
@@ -69,9 +69,9 @@
 			doc.grand_total += flt(data.amount);
 			$('.tax-grand-total').text(format_number(doc.grand_total, doc.number_format, 2));
 		})
-	},
+	}
 
-	submit_rfq: function(){
+	submit_rfq(){
 		$('.btn-sm').click(function(){
 			frappe.freeze();
 			frappe.call({
@@ -90,12 +90,12 @@
 				}
 			})
 		})
-	},
+	}
 
-	navigate_quotations: function() {
+	navigate_quotations() {
 		$('.quotations').click(function(){
 			name = $(this).attr('idx')
 			window.location.href = "/quotations/" + encodeURIComponent(name);
 		})
 	}
-})
+}