Function updateClassString

packages/cli/src/transform.ts:355–364

* Apply updates to a class string (space-separated list of classes).

(
  classStr: string,
  updates: ClassNameUpdate[]
)

 * Apply updates to a class string (space-separated list of classes).
 */
function updateClassString(
  classStr: string,
  updates: ClassNameUpdate[]
): string {
  let classes = classStr.split(/\s+/).filter(Boolean);
  for (const update of updates) {
    classes = applyUpdate(classes, update);
  }
  return classes.join(" ");
}

/**
 * Check if a cn()/clsx() call has the prefix in a conditional argument.