implement timeout for creating Yjs instance

examples/textarea/index.js

@@ -12,17 +12,20 @@ Y({
   connector: {
     name: 'websockets-client',
     room: 'Textarea-example',
-    url: url || 'http://127.0.0.1:1234'
+    url: 'https://yjs-v13.herokuapp.com/'
   },
   sourceDir: '/bower_components',
   share: {
     textarea: 'Text', // y.share.textarea is of type Y.Text
     test: 'Array'
-  }
+  },
+  timeout: 5000 // reject if no connection was established within 5 seconds
 }).then(function (y) {
   window.yTextarea = y
 
   // bind the textarea to a shared text element
   y.share.textarea.bind(document.getElementById('textfield'))
   // thats it..
+}).catch(() => {
+  console.log('Something went wrong while creating the instance..')
 })

src/y.js

@@ -139,10 +139,20 @@ export default function Y (opts/* :YOptions */) /* :Promise<YConfig> */ {
       opts.share = Y.utils.copyObject(opts.share)
       Y.requestModules(modules).then(function () {
         var yconfig = new YConfig(opts)
+        let resolved = false
+        if (opts.timeout != null && opts.timeout >= 0) {
+          setTimeout(function () {
+            if (!resolved) {
+              reject(new Error('Yjs init timeout'))
+              yconfig.destroy()
+            }
+          }, opts.timeout)
+        }
         yconfig.db.whenUserIdSet(function () {
           yconfig.init(function () {
+            resolved = true
             resolve(yconfig)
-          })
+          }, reject)
         })
       }).catch(reject)
     }