refactor: Replace Class.extend with native class
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
+}