Trap exceptions on WebSocket create (#114)

package.json

@@ -8,6 +8,10 @@
   "workspaces": [
     "packages/*"
   ],
+  "resolutions": {
+    "babel-core": "^7.0.0-bridge.0",
+    "typescript": "^2.9.2"
+  },
   "scripts": {
     "build": "polkadot-dev-build-ts",
     "check": "tslint --project . && tsc --noEmit",
@@ -16,7 +20,7 @@
     "test": "jest --coverage"
   },
   "devDependencies": {
-    "@polkadot/dev": "^0.20.9",
+    "@polkadot/dev": "^0.20.11",
     "@polkadot/ts": "^0.1.8"
   }
 }

packages/api-provider/src/ws/connect.ts

@@ -10,10 +10,14 @@ import onMessage from './onMessage';
 import onOpen from './onOpen';
 
 export default function connect (self: WsState): void {
-  self.websocket = new WebSocket(self.endpoint);
+  try {
+    self.websocket = new WebSocket(self.endpoint);
 
-  self.websocket.onclose = onClose(self);
-  self.websocket.onerror = onError(self);
-  self.websocket.onmessage = onMessage(self);
-  self.websocket.onopen = onOpen(self);
+    self.websocket.onclose = onClose(self);
+    self.websocket.onerror = onError(self);
+    self.websocket.onmessage = onMessage(self);
+    self.websocket.onopen = onOpen(self);
+  } catch (error) {
+    self.l.error(error);
+  }
 }