test-runner: write out timestamp as first line in watch mode

[jsumners-nr]

What is the problem this feature will solve?

Currently, running node --watch --test some.test.js and then making changes in that test file will result in difficult to recognize output. That is, it's difficult to determine if the output is new when the result hasn't changed.

What is the feature you are proposing to solve the problem?

Whenever watch mode re-runs the script, write out a timestamp as the first line of the output, e.g. console.log(new Date().toISOString()).

What alternatives have you considered?

No response

[pmarchini]

Hey @jsumners-nr, thanks for opening this issue.
I don't know if it could be helpful in your use case, but did you consider implementing a custom reporter?

Here is the link to the documentation: https://nodejs.org/api/test.html#custom-reporters

[jsumners-nr]

I don't know if it could be helpful in your use case, but did you consider implementing a custom reporter?

No, not for this.

[cjihrig]

@pmarchini this may be worth doing in core. Watch mode outside of the test runner does print a "Restarting" message.

[pmarchini]

@cjihrig if you think that this can be a useful addition to core no objections on my side 😁

[ChristianHSousa]

Im new to open-source projects. Can I still contribute?

[pmarchini]

Hey @ChristianHSousa, sure! If you want to try opening a PR, you’re more than welcome 😁

[CoderRahul9904]

@ChristianHSousa +1