--- a/rollup.config.js	Mon Jan 06 23:52:30 2020 -0800
+++ b/rollup.config.js	Thu Jan 09 00:04:45 2020 -0800
@@ -1,31 +1,65 @@
 import builtins from "rollup-plugin-node-builtins";
 import commonjs from "@rollup/plugin-commonjs";
+import postcss from "rollup-plugin-postcss";
 import resolve from "@rollup/plugin-node-resolve";
 import typescript from "rollup-plugin-typescript2";
 
-export default {
+const workaround_jsonld_module_system_picker = "process = {version: '1.0.0'}";
+const workaround_some_browser_detector = "global = window";
+const workaround_jsonld_expand_issue = {
+  namedExports: {
+    jsonld: ["expand"] // fixes "expand is not exported by node_modules/jsonld/lib/index.js"
+  }
+};
+
+export default [
+  {
     input: "src/index.ts",
     output: {
-        file: "build/bundle.js",
-        format: "cjs", // just for the namedExports hack
-        intro: "const global = window;",
-        
+      file: "build/bundle.js",
+      format: "esm",
+      intro: `const ${workaround_some_browser_detector}, ${workaround_jsonld_module_system_picker};`
     },
-    // only for final build. demo page does need these modules, so I guess this file should observe some kind of build mode.
-    external: ['@polymer/polymer','lit-html','@polymer/decorators','n3','jsonld'],
+    external: [
+      "@polymer/polymer",
+      "lit-html",
+      "@polymer/decorators",
+      "n3",
+      "jsonld"
+    ],
     plugins: [
-        builtins(),
-        resolve({
-            extensions: [".js", ".ts"],
-            browser: true,
-            only: ['streamed-graph']
-        }),
-        typescript(),
-        commonjs({
-            namedExports: {
-                'jsonld': ['expand'], // fixes "expand is not exported by node_modules/jsonld/lib/index.js"
-            }
-        }),
-      
+      builtins(),
+      resolve({
+        extensions: [".js", ".ts"],
+        browser: true,
+        only: ["streamed-graph"]
+      }),
+      typescript(),
+      postcss({
+        inject: false
+      }),
+      commonjs(workaround_jsonld_expand_issue)
     ]
-};
+  },
+  {
+    input: "src/demo.ts",
+    output: {
+      file: "build/demo.js",
+      format: "esm",
+      intro: `const ${workaround_some_browser_detector}, ${workaround_jsonld_module_system_picker};`
+    },
+    external: [],
+    plugins: [
+      builtins(),
+      resolve({
+        extensions: [".js", ".ts"],
+        browser: true
+      }),
+      typescript(),
+      postcss({
+        inject: false
+      }),
+      commonjs(workaround_jsonld_expand_issue)
+    ]
+  }
+];