Expose a logger interface

[Sytten]

Problem

Currently there are a lot of console.error calls in the NodeEngine and prisma client. This is problematic since it will not forward those logs to the proper transports.

Solution

It would be better off to have a general logging interface with a default implementation to console that users can override to provider their own logger like winston.

Alternatives

Collect logs from STDOUT and send them.

EDIT1:
Another alternative is to use the .on method ad explained here: https://github.com/prisma/specs/tree/master/prisma-client-js#logging

[timsuchanek]

Thanks for creating the issue. This should probably just tie into the existing log levels have defined here: https://github.com/prisma/specs/tree/master/prisma-client-js#logging

Note, that right now you can already do prisma.on('info', e => logger.log(e.message))

[Sytten]

Agreed, it would be a duplicate log for the user, but its a work around. I will update the issue.

[Sytten]

@timsuchanek Should I open an issue to document that?