[Question] How would you send properly send error for GQL Subcriptions

[Moonnz]

Hello :)

I've been using Mercurius with NestJS without any issues until now. However, as I'm implementing a subscription, I'm finding it challenging to properly send errors through the subscription WebSocket in accordance with the graphql-ws protocol.

I haven't been able to find any resources on this within the NestJS ecosystem, and it seems there isn't much available within the Mercurius ecosystem either.

Has anyone here managed to handle this or encountered something similar? Any relevant insights would be greatly appreciated!

[Moonnz]

I will create a real issue here, but apparently it's caused by thoose lines of code in the subscription-connection.js file :

case this.protocolMessageTypes.GQL_START: {
  if (this.isReady) {
    this.handleGQLStart(data).catch((e) => {
      this.sendMessage(
        this.protocolMessageTypes.GQL_ERROR,
        id,
        e.message
      )
    })
  }

The graphql-ws protocol said the payload should be an Array of GraphqlError

[Moonnz]

1105