fix

src/frontend/widget/rollup.config.js

@@ -0,0 +1,27 @@
+import resolve from 'rollup-plugin-node-resolve';
+import typescript from 'rollup-plugin-typescript2';
+
+export default {
+    input: 'src/frontend/widget/main.ts',
+    output: {
+        file: 'FrontendPlugin.js',
+        format: 'system'
+    },
+    plugins: [
+        resolve({
+            // pass custom options to the resolve plugin
+            customResolveOptions: {
+                moduleDirectory: 'node_modules'
+            }
+        }),
+        typescript({
+            typescript: require('typescript'),
+            tsconfig: "tsconfig.frontend.json"
+        })
+    ],
+    external: [
+        'plugins-core',
+        '@angular/core',
+        '@angular/common'
+    ]
+}