X_RELATIVE_PATH_NOT_POSIX
Means
a host relative() answer is used without toPosix
Typical cause
on Windows relative() answers with \`, which the result then writes into an import specifier, a fix line or a key — a x fix` edit that breaks every Linux teammate
Fix
wrap the call as toPosix(relative(…)), or use posixRelative(…) from packages/cli/src/posix-path.ts; a filesystem-only answer is marked // native-path: <why>. Then bun run posix-relative