feature: babel + transform-runtime

.babelrc

@@ -0,0 +1,24 @@
+{
+    "presets": [
+        [
+            "@babel/preset-env",
+            {
+                "modules": "commonjs"
+            }
+        ]
+    ],
+    "plugins": [
+        "@babel/plugin-proposal-class-properties",
+        "@babel/plugin-proposal-object-rest-spread",
+        [
+            "@babel/plugin-transform-runtime",
+            {
+                "absoluteRuntime": false,
+                "corejs": 3,
+                "helpers": true,
+                "regenerator": true,
+                "useESModules": false
+            }
+        ]
+    ]
+}

build/webpack.common.js

@@ -13,8 +13,8 @@ module.exports = {
         rules: [
             {
                 test: /\.ts$/,
-                use: 'ts-loader',
-                exclude: /node_modules/,
+                use: ['babel-loader', 'ts-loader'],
+                include: /src/,
             },
             {
                 test: /\.css$/,