This version uses Rollup instead of WebPack.

Due to that the code is smaller and has changes to prevent Circular Dependencies

rollup.config.js

@@ -0,0 +1,95 @@
+/*
+npm install rollup rollup-plugin-includepaths rollup-plugin-babel rollup-plugin-external-globals rollup-plugin-html rollup-plugin-terser
+rollup -c
+*/
+
+import babel from 'rollup-plugin-babel';
+import includePaths from 'rollup-plugin-includepaths';
+import externalGlobals from "rollup-plugin-external-globals";
+import html from 'rollup-plugin-html';
+import { terser } from "rollup-plugin-terser";
+
+let includePathOptions = {
+	include: {},
+	paths: ['dev'],
+	external: [],
+	extensions: ['.js', '.html']
+};
+
+let babelConfig = {
+	exclude: 'node_modules/**',
+	babelrc: false,
+	presets: [
+		[
+			'@babel/preset-env',
+			{
+				targets: {"chrome": "60"},
+				loose: true,
+				modules: false
+			}
+		]
+	],
+	plugins: [
+		[
+			'@babel/plugin-proposal-decorators',
+			{
+				legacy: true
+			}
+		],
+		'@babel/plugin-proposal-class-properties'
+	]
+};
+
+let terserConfig = {
+	output: {
+		comments: false
+	},
+	keep_classnames: true, // Required for AbstractModel and AbstractCollectionModel
+	compress:{
+		ecma: 6,
+		drop_console: true
+/*
+		,hoist_props: false
+		,keep_fargs: false
+		,toplevel: true
+		,unsafe_arrows: true // Issue with knockoutjs
+		,unsafe_methods: true
+		,unsafe_proto: true
+*/
+	}
+//	,mangle: {reserved:['SendMessage']}
+};
+
+export default [{
+	external: ['ko'],
+	input: 'dev/admin.js',
+//	dest: 'snappymail/v/0.0.0/static/js/admin.rollup.js',
+	output: [
+		{file: 'snappymail/v/0.0.0/static/js/admin.js', format: 'iife'}, // format: 'es'
+		{file: 'snappymail/v/0.0.0/static/js/min/admin.min.js', format: 'iife', plugins: [terser(terserConfig)], }
+	],
+	plugins: [
+		babel(babelConfig),
+		includePaths(includePathOptions),
+		externalGlobals({
+			ko: 'ko'
+		})
+	],
+}, {
+	external: ['ko'],
+	input: 'dev/app.js',
+	output: [
+		{file: 'snappymail/v/0.0.0/static/js/app.js', format: 'iife'},
+		{file: 'snappymail/v/0.0.0/static/js/min/app.min.js', format: 'iife', plugins: [terser(terserConfig)], }
+	],
+	plugins: [
+		babel(babelConfig),
+		includePaths(includePathOptions),
+		externalGlobals({
+			ko: 'ko'
+		}),
+		html({
+			include: '**/*.html'
+		})
+	],
+}];