Conditional args to jest_test based on bazel command line config.

[James Lee]

Hi all.

Based on other conversations, it may not be possible.

But still, I want to know whether there are other ways to achieve what I want to do.

So, as in jest_test macro sample, there is "--colors" arg passed to jest_test.

This jest cli produces log file with ANSI escape code to have color coding.
I do not want to pass "--colors", when "--config ci" is passed in command line to debugging easy in ci,

but want to pass "--colors" otherwise to see the color coding.

So, what will be the best approach given the jest_test is a macro and to pass some args to the macro conditionally based on bazel command line options?

Thank you.

- James

[Philipp Schrader]

Is the underlying "_jest_test" function a macro that inspects the arguments? If not, you should be able to use a select here.

Define a bool_flag() in a BUILD file and set it in your --config=ci config.

Then you'll want to patch the jest_test that you linked to look something like this:

templated_args = [

     "--no-cache",

     "--no-watchman",
     "--ci",

] + select({

    "//path/to:flag_config_setting": ["--colors"],

    "//conditions:default": [],

})
templated_args += ["--config", "$(rootpath %s)" % jest_config]
for src in srcs:

    templated_args += ["--runTestsByPath", "$(rootpath %s)" % src]

I.e. select() supports the + operator, but it doesn't support ".extend()".

Hope that makes sense.

Phil