Function applyModulePrefix

src/resolution/frameworks/nestjs.ts:664–675

* Recompute a route node's `name` by prepending `prefix` to the *original* * in-file path. The original is recovered from `qualifiedName`, which the * per-file extract emits as `${filePath}::${method}:${path}` and which this * pass deliberately never mutates — that's what keeps the update idempot

(route: Node, prefix: string)

 * pass deliberately never mutates — that's what keeps the update idempotent.
 */
function applyModulePrefix(route: Node, prefix: string): Node | null {
  const sep = '::';
  const idx = route.qualifiedName.indexOf(sep);
  if (idx < 0) return null;
  const tail = route.qualifiedName.slice(idx + sep.length);
  const colon = tail.indexOf(':');
  if (colon < 0) return null;
  const method = tail.slice(0, colon);
  const original = tail.slice(colon + 1);
  const newName = `${method} ${joinHttpPath(prefix, original)}`;
  return { ...route, name: newName, updatedAt: Date.now() };
}

// ---------------------------------------------------------------------------
// Small string utilities (object/array literal splitters)