Close issue on GitHub pull request to non master branch

Question

I am aware of how to close an issue using a pull request message. But that only happens if the destination branch is master.

What if i want to close an issue while merging to a non master branch?

Is it even possible?

Answer 1

Technically, it isn't important whether you push to master or some other branch. What matters is that you push to the default branch, which defaults to master but can be changed if you have repository admin rights.

Pushing to non-default branches does not close issues:

If the commit is in a non-default branch, the issue will remain open and the issue will be referenced with a tooltip.

It should be possible to build something to automatically close issues based on commits to multiple branches using the GitHub API, but out of the box you're out of luck.