What version of Oxlint are you using?

1.67.0 (built from current main, commit 39d92d65e9)

What command did you run?

tmpdir=$(mktemp -d)
printf 'var x = 1;\n' > "$tmpdir/test.js"
chmod 444 "$tmpdir/test.js"
target/debug/oxlint --fix -D no-var "$tmpdir/test.js"

What does your .oxlintrc.json (or oxlint.config.ts) config file look like?

No config file.

What happened?

I hit a deterministic panic when --fix tries to write back to a read-only file.

The repro above currently crashes with:

thread '<unnamed>' panicked at crates/oxc_linter/src/service/runtime.rs:722:75:
called `Result::unwrap()` on an `Err` value: Os { code: 13, kind: PermissionDenied, message: "Permission denied" }

RuntimeFileSystem::write_file already returns Result<(), std::io::Error>, so this looks like the fix path is still unwrapping a normal OS write error.

I would expect oxlint to report a regular write failure for that file and exit non-zero, rather than panic.