node.js: morgan deprecated default format: use combined format

>PROBLEM

The server throws the following server's message:
  morgan deprecated default format: use combined format

>SOLUTIONS

>>POSSIBILITY #1 ----------------------------------

BEFORE:
app.use(logger);


AFTER:
app.use(logger('combined'));


@FROM:
stackoverflow.com/questions/36397812/morgan-deprecated-expressjs/36398066


>>POSSIBILITY #2 ----------------------------------

BEFORE:
app.use(logger(process.env.AMBIENTE));
...
require('dotenv').config();


AFTER:
require('dotenv').config();
..
app.use(logger(process.env.AMBIENTE));