Error in creating WebSocket connection

Hello! I am getting an error in generating a WebSocket connection, specifically:

Uncaught DOMException: Failed to construct 'WebSocket': The URL 'undefined' is invalid.

I’ve done a little source-diving, and it appears to be a mismatch between the output to SubscriptionClient of subscriptions-transport-ws and the input to WebSocketLink from apollo-link. It seems that SubscriptionClient has a url property, but WebSocketLink is looking for uri:

https://github.com/apollographql/subscriptions-transport-ws/blob/0da748556bc24ec972dd27afc840e6d63b661b2e/src/client.ts#L112

https://github.com/apollographql/apollo-link/blob/f2124e60dc3720226fd4a88402435fa96835221d/packages/apollo-link-ws/src/webSocketLink.ts#L13

https://github.com/apollographql/apollo-link/blob/f2124e60dc3720226fd4a88402435fa96835221d/packages/apollo-link-ws/src/webSocketLink.ts#L42

Does this seem like a bug, or am I missing something else here?

---

This issue pertains to the following package(s):

• GraphQL Playground - Electron App
• GraphQL Playground HTML
• GraphQL Playground
• GraphQL Playground Express Middleware
• GraphQL Playground Hapi Middleware
• GraphQL Playground Koa Middleware
• GraphQL Playground Lambda Middleware

What OS and OS version are you experiencing the issue(s) on?

macOS High Sierra

What version of graphql-playground(-electron/-middleware) are you experiencing the issue(s) on?

v1.5.7

What is the expected behavior?

No errors in WebSocket connection.

What is the actual behavior?

Error in creating a WebSocket connection.

What steps may we take to reproduce the behavior?

Unknown yet.

[adrian-baker]

I’m not creating the link in my own code though, I’m just using the <Playground/> component.

I seem to have been able to avoid the problem, based on the hint in this comment, I’ve added to package.json:

  "resolutions": {
    "subscriptions-transport-ws": "0.9.14",
    "apollo-link-ws": "1.0.8",
    "graphql": "14.0.2"
  }

[nelsonBlack]

experiencing same problem as @eliperelman , was a fix done ?