Firebase function winston logging severity

I'm using firebase functions (node 10 Beta) with winston.

I've the console transport configured and my logs are going to stackdriver.

They're coming as textPayload without severity level, is there any config that I'm missing?

I achieved this using node 8 with loggin-winston transport, which I think is not recommended.

[working] Node 8:

const logger = winston.createLogger({
  level: 'info',
  transports: [
    new winston.transports.Console(),
    new LoggingWinston(),
  ],
});

Deps:

"@google-cloud/logging-winston": "^3.0.4"
"winston": "^3.2.1"

Stackdriver console: enter image description here

[not working] Node 10 beta:

const logger = winston.createLogger({
  level: 'info',
  transports: [
    new winston.transports.Console(),
    new LoggingWinston(),
  ],
});

Deps:

"@google-cloud/logging-winston": "^3.0.4"
"winston": "^3.2.1"

Stackdriver console:

enter image description here

Sample repo - deploy it on node8 and node10 to check the differences