Just when I thought I understood the MIT license, I'm back to confused. Can you link me to where this is clearly outlined? Do you need to attribute somewhere in artifacts or not?
The repeated distinction between source code and "artifacts" in this context is pure make-believe. The license doesn't even have those words in it, let alone say something like "Redistribution and use in source form requires inclusion of this permission notice and the above copyright notice, but if you're just building a product and publishing it as non-source code artifacts instead of distributing source, then lol don't worry about it bro" (or whatever it is the people here seem to think).
The CodeMirror maintainer definitely expects people who build closed source stuff to include the notices that are in the CodeMirror LICENSE file. And anyone telling you the license doesn't require this (and e.g. this is a peculiarity of CodeMirror itself) is delusional.
And this was my understanding of how it works for artifacts. You don't have to attribute in the software itself, just the code.
Not sure if you were referring directly to me, but I don't think my comment was harmful. Others may have also been led astray and an exchange like this might be educational for them to read.