fix(resolution): remove catastrophic backtracking in the Vapor route regex

__tests__/frameworks.test.ts

@@ -1436,6 +1436,19 @@ describe('vaporResolver.extract', () => {
     expect(references[0].referenceName).toBe('listUsers');
   });
 
+  it('does not backtrack exponentially on a call that never reaches use: (#1544)', () => {
+    // `app.get(a, b, c, ... )` with no `use:` label: the route regex must fail
+    // fast. The previous pattern had `\s*` inside the repeated group, which
+    // overlapped `[^,()]+`, so each extra argument roughly quadrupled the work
+    // and a generated file could hang indexing for minutes.
+    const args = Array.from({ length: 40 }, (_, i) => `arg${i}, `).join('');
+    const src = `app.get(${args}x)\n`;
+    const started = Date.now();
+    const { nodes } = vaporResolver.extract!('routes.swift', src);
+    expect(Date.now() - started).toBeLessThan(1000);
+    expect(nodes).toEqual([]);
+  });
+
   it('extracts grouped RouteCollection routes with the group prefix and no path arg', () => {
     const src = `
 func boot(routes: RoutesBuilder) throws {

src/resolution/frameworks/swift.ts

@@ -367,7 +367,14 @@ export const vaporResolver: FrameworkResolver = {
     // (`BlogUser.parameter`, `:id`, a path constant) so accept any comma-separated
     // args before `use:` — the label keeps only the string parts. `use:`
     // discriminates a real route from Environment.get("X")/req.parameters.get("X").
-    const routeRegex = /\b(\w+)\.(get|post|put|patch|delete|head|options)\s*\(\s*((?:[^,()]+,\s*)*)use:\s*([A-Za-z_][\w.]*)/g;
+    // The `\s*` that used to sit inside the repeated group overlapped
+    // `[^,()]+` (which also matches whitespace), so every space after a comma
+    // could be consumed by either branch. On a call whose argument list never
+    // reaches `use:` that ambiguity backtracks exponentially — ~4x per extra
+    // argument, seconds by 28 — hanging index/sync/MCP on generated files.
+    // Keeping the group purely `<run>,` and matching the gap before `use:`
+    // once, outside the loop, leaves exactly one way to split the input.
+    const routeRegex = /\b(\w+)\.(get|post|put|patch|delete|head|options)\s*\(\s*((?:[^,()]+,)*)\s*use:\s*([A-Za-z_][\w.]*)/g;
     let match: RegExpExecArray | null;
     while ((match = routeRegex.exec(safe)) !== null) {
       const [, receiver, method, segsStr, handlerExpr] = match;