indeterministic behaviour building nodejs projects

Hello, we are experiencing flapping builds when using the setup-node action where occasionally builds fail with “unexpected token” errors. At first the Github Support advised to upgrade from v1 to v2. At first it appeared to have solved the problem, though now we see the same indeterministic behaviour again which is also not reproducible locally. I tried to use different NodeJS versions and enabled the workflow debug logging via the ACTIONS_STEP_DEBUG=true secret in our repository, but all with no avail. The Github Support suggested to reach out here and try to gather more information about how to debug this situation further. Example builds are shown below. You see that two builds execute npm run build of which one succeeds and one fails, even though both build the same project.

• https://github.com/venturemark/webclient/pull/92/checks?check_run_id=1606578858
• https://github.com/venturemark/webclient/pull/92/checks?check_run_id=1606578880

[xh3b4sd]

I solved it myself though I cannot really explain why it was broken. What I did was I removed rollup in the build process of numnum and only used tsc instead to build it. This solved the problem. Though I also do not understand why this happened in the build container when running Github actions and why it was not reproducible for anyone on their local machine.

[aminya]

That is a problem with your build tools. Nodejs has set up the version you requested as expected: https://github.com/venturemark/webclient/pull/92/checks?check_run_id=1606578880#step:3:19 https://github.com/venturemark/webclient/pull/92/checks?check_run_id=1606578858#step:3:19