How to disable "Determining test suites to run" text?

[ljharb]

It looks like the initial text "Determining test suites to run" only can be hidden by "not being a TTY" or by "being CI".

Is there any way a custom reporter could suppress this information?

I'm trying to parse the output, and this additional (colored) output makes it more difficult. Currently I can set CI=true or similar, but this is only a temporary workaround - I'd like it to be implied by the custom reporter, if possible.

[cpojer]

We could change it, but we are writing this before creating the TestRunner which manages the reporters. Do you need information while the test run is ongoing and this is why you cannot rely on --json? It would be great if Jest had an interactive mode that streams JSON.

[ljharb]

In this case, I don't want the user to have to specify --json - JSON is a built-in reporter; I want a custom one.

In other words, I want to ensure that the only output jest produces, period, comes from the custom reporter.

[cpojer]

Yeah, that makes sense to me. Happy to review PRs for this :)

[ljharb]

Do you have any suggestions about where to start?

It seems like constructing the TestRunner earlier, and then calling a new instance method that takes the default output and returns a Promise for the actual output (ie, undefined would output nothing) would work?

If so, should this instance method only control this output, or should it be generic enough to control all output? One possible signature is (type: <some enum>, defaultOutput: String) => Promise<String> (or whatever the type notation is supposed to be).

Thoughts?

[cpojer]

I'm going to merge this into #4471 because @aaronabramov is exploring how to expand reporters and take them out of the lifecycle of TestRunner. I recommend following up with him on that task.

[cpojer]

^ I should add @aaronabramov was planning on doing this this week.

[aaronabramov]

i was experimenting with it last night.. and i think it would be awesome to only print to stdout/stderr from reporters and ship the default reporter in a modular way (maybe as a separate package) so it can be extended/modified.

i was able to get 95% of it done, the only problem we have with that is that our globalConfig is not immutable and changes throughout the flow. Once we get this fixed we can fully switch to using reporters for any logging.

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