Added CORS header.

inc/headers-middleware.js

@@ -0,0 +1,4 @@
+export function setHeaders(req, res, next) {
+  res.setHeader('Access-Control-Allow-Origin', '*');
+  next();
+}

server.js

@@ -9,6 +9,7 @@ import publishRoute from "./routes/publish.js";
 import {ViewSync} from "./inc/view-sync.js";
 import {previewFiles, staticFiles} from "./routes/static-files.js";
 import {setupWatcher} from "./inc/changes-watcher.js";
+import {setHeaders} from "./inc/headers-middleware.js";
 
 const {expressApp, httpServer} = init();
 
@@ -21,8 +22,10 @@ httpServer.listen(PORT, '0.0.0.0', () => {
   console.log(`Server app listening on port ${PORT}`)
 });
 
-// Setup Gulp
+// Middleware
+expressApp.use(setHeaders);
 
+// Routes
 expressApp.get('/', index);
 expressApp.get('/data', dataRoute);
 expressApp.get('/view/:baseView', baseView);
@@ -30,3 +33,4 @@ expressApp.get('/design/:project/:blockName/*', previewFiles);
 expressApp.get('/block/:project/:blockName/*', staticFiles);
 expressApp.post('/sync', syncRoute);
 expressApp.get('/publish', publishRoute);
+