test-repo/changelog_unreleased/api/20127.md

Support configuration files with UTF-8 BOM (#20127 by @fisker)

# Input
$ cat .prettierrc.json
{"semi":false}
$ prettier example.js --check

# Prettier stable
Invalid configuration for file "example.js":
JSON Error in .prettierrc.json:
Unexpected token "" (\u{feff})

# Prettier main
Checking formatting...
[warn] example.js
[warn] Code style issues found in the above file. Run Prettier with --write to fix.