Function isComplexSegment

http/unstable_route.ts:197–203

* Returns true if a pathname segment contains URLPattern syntax that the * radix tree cannot model structurally — i.e. it is not a plain static * string, a bare `:param`, or a standalone `*`. * * Affected syntax: * - Optional / non-capturing groups: `{.ext}?` `{foo}` * - Regex-constrai

(segment: string)

 * clause. This is intentional — the two checks subsume each other for `*`.
 */
function isComplexSegment(segment: string): boolean {
  if (segment.includes("{") || segment.includes("(")) return true;
  if (segment.includes("*") && segment !== "*") return true;
  if (segment.endsWith("?") || segment.endsWith("+")) return true;
  if (segment.includes("\\")) return true;
  return false;
}

function createNode(): RouteNode {
  return {