prettier

1c2ef1f0 - Extract `isNewlineCharacter` to eliminate duplication (#18182)

Extract `isNewlineCharacter` to eliminate duplication (#18182) Co-authored-by: fisker <172584+fisker@users.noreply.github.com> Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>