Weirdly, the test/cli/samples/watch/bundle-error test fail on some platforms.

Yes, this is completely weird. It seems to be caused by your change, but I do not understand how. I also saw this problem locally for a moment, but then it worked again mysteriously.

I found the test/cli/samples/watch/bundle-error test is similar to test/cli/samples/watch/watch-config-initial-error, the only or greatest difference is test/cli/samples/watch/bundle-error folder does not contain main.js file at first.

Codecov Report

Merging #4749 (3f1fc51) into master (e315ffc) will increase coverage by 0.00%.
The diff coverage is 88.88%.

@@           Coverage Diff           @@
##           master    #4749   +/-   ##
=======================================
  Coverage   99.04%   99.04%           
=======================================
  Files         217      217           
  Lines        7709     7711    +2     
  Branches     2134     2134           
=======================================
+ Hits         7635     7637    +2     
  Misses         24       24           
  Partials       50       50           

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Ok, here is what I found:

• abortOnStderr was triggered individually for each line in the output because logging.ts writes the error output in several chunks by calling the stderr function several times.
• because the error message was contained both in the first output line as well as the stack trace, this triggered rewriting the file twice.
• when the error message was removed from the stack trace, this obviously now only triggered writing the file once. Even though the test already had a 500ms wait between the message and writing the file, this apparently was not enough to pick up the changed file sometimes.
• when I changed the test to look for a text contained only in the stack trace, this fixed the test reliably. However, I would not want to make assertions on the stack trace content as functions are renamed from time to time.
• Instead, I changed logging.ts to write all lines together. This also fixes the test and is probably not a bad idea.

Unless you have anything else to add, I would merge this by tomorrow.

Awesome, I have nothing to add.

This PR has been released as part of rollup@3.7.5. You can test it via npm install rollup.