customWrapper.ts

// make `globalThis.after()` available in next 14
// open-next.config.ts
import type { OpenNextConfig } from '@opennextjs/aws/types/open-next.js';
const config = {
  default: {
    override: {
      wrapper: () => import('./customWrapper').then((mod) => mod.default),
    },
  },
} as OpenNextConfig;
export default config;

// customWrapper.ts
import defaultWrapper from '@opennextjs/aws/overrides/wrappers/aws-lambda-streaming.js';

export type AfterTask<T = unknown> = Promise<T> | AfterCallback<T>;
export type AfterCallback<T = unknown> = () => T | Promise<T>;

declare global {
  function after<T>(task: AfterTask<T>): void;
}

globalThis.after = (task) => {
  const NEXT_REQUEST_CONTEXT_SYMBOL = Symbol.for('@next/request-context');

  // @ts-expect-error this is fine
  globalThis[NEXT_REQUEST_CONTEXT_SYMBOL].get().waitUntil(task);
};
export default defaultWrapper;