Function lexicalPathWithinRoot

src/utils.ts:96–99

(projectRoot: string, filePath: string)

 * contents get served — those must keep the symlink-aware check (#527).
 */
export function lexicalPathWithinRoot(projectRoot: string, filePath: string): string | null {
  const resolved = path.resolve(projectRoot, filePath);
  return isWithinDir(resolved, path.resolve(projectRoot)) ? resolved : null;
}

/**
 * Validate that a file path stays within the project root, resolving symlinks.