Console.log statements output nothing at all in Jest

问题

console.log statements output nothing at all in Jest. This was working for me yesterday, and all of sudden, it's not working today. I have made zero changes to my config and haven't installed any updates.

I'm not using the --forceExit option. Still seeing this issue.

回答1:

As per comment on https://github.com/facebook/jest/issues/2441,

Try setting verbose: false (or removing it) in the jest options in package.json.

回答2:

You can run both options together like this --watch --verbose false if you want to also be watching the files and see the output.

for one time runs just do --verbose false

回答3:

in addition to --verbose option which can cause this as mentioned, be aware that the --watch may also cause this bug.

回答4:

Also be sure that your jest config does not have silent: true. In my case, I didn't realize that someone else had added that to our config.

I don't see it in the list of config options, but the command line flag is documented here.

回答5:

In my case the problem was that the logs where made when the module is required, so before the start of an actual test case. Change from a top-level import to using require inside the test case fixed the problem.

来源：https://stackoverflow.com/questions/48695717/console-log-statements-output-nothing-at-all-in-jest