Function applyPatches

packages/hono/src/shared/applyPatches.ts:27–56

(app: Hono<E>)

 * - Retroactively instruments sub-apps mounted before `sentry()` was called.
 */
export function applyPatches<E extends Env>(app: Hono<E>): void {
  // Always call — installRouteHookOnPrototype is idempotent and returns existing handle when prototype already patched
  _routeHook = installRouteHookOnPrototype();

  // `app.use` (instance own property) — wraps middleware at registration time on this instance.
  patchAppUse(app);

  // `app.get`, `app.post`, … (instance own properties) — wraps inline middleware (all-but-last handler).
  patchHttpMethodHandlers(app);

  patchAppRequest(app);

  _routeHook.activate();

  const pendingSubApps = _routeHook.getPendingSubApps();

  if (pendingSubApps.size > 0) {
    DEBUG_BUILD &&
      debug.log(
        `[hono] ${pendingSubApps.size} sub-app(s) were mounted before sentry(). Tracing is applied retroactively. Consider registering sentry() before calling app.route().`,
      );
  }

  for (const subApp of pendingSubApps) {
    wrapSubAppMiddleware(subApp.routes as HonoRoute[]);
    patchAppRequest(subApp);
  }

  pendingSubApps.clear();
}