Why are both some-file.js and with-file.js printed in this example, can you explain the relationship between them?

./some-file.js is a custom filename, ./with-file.js! is the module identifier in which the loader has been processed and emitted an error. This maybe useful for those loaders who bundles a few files and is still willing to print diagnostic for some certain files.

Ok, with-file is a bit confusing, maybe we can use current-file.js or original-file.js instead.

I will change with-file to loader.js as this is the filename of the loader.

I tested in a demo and it seems to be the module identifier of current module rather than loader filename:

I used inline loader for the test. Check this out.

When using inline loaders, the log:

# should be 
./current-file.jsx (./loader.js!./current-file.jsx) 1:1-4

# instead of
(./loader.js!) 1:1-4

Try !./loader.js! instead please. You may take these test cases as the reference https://github.com/web-infra-dev/rspack/blob/0befe4435a6502070a431234a29023c80f3de455/packages/rspack-test-tools/tests/diagnosticsCases/module-build-failed/loader-emit-diagnostic/index.js.