macOS High Sierra - Version - 10.13.2 (17C88)
graphql-playground-middleware-lambda - 1.3.7
The playground when loaded from lambda with graphql-yoga as the primary dependency should work correctly, as graphql-yoga is abstracting underlying dependencies like graphql-playground-middleware-lambda, it should be opaque to the developer and load the correct playground assets.
An attempted serverless local deploy with npm start in this repository resolved to 404 URL for playground assets.
Clone - https://github.com/divyenduz/graphql-serverless-deploy-example
Run
npm install
npm start
Open http://localhost:3000 and check network tab.

I've just released a new version. Can you verify this is still a problem?
This should be fixed with [email protected] ✅
I can confirm that this is resolved. Thanks for the super quick turnaround.
I am having the same issue, reproduced all the steps above. Not receiving any errors on the console, but {"statusCode":404,"error":"Not Found","message":"Not Found"} on console log.