Function fn

webapp/_webapp/src/intermediate.ts:118–147

(args: A)

  // The callable function - works in both MAIN and ISOLATED world
  // Dispatches event and waits for response from ISOLATED world's handler
  const fn = (args: A): Promise<T> => {
    const seq = uuidv4();
    window.dispatchEvent(new CustomEvent(reqEvtName, { detail: { seq, req: args } }));
    return new Promise((resolve, reject) => {
      function resListener(evt: Event): void {
        const customEvt = evt as CustomEvent;
        const { res } = customEvt.detail;
        cleanup();
        resolve(res);
      }
      function errListener(evt: Event): void {
        const customEvt = evt as CustomEvent;
        const { err } = customEvt.detail;
        cleanup();
        reject(err);
      }
      function cleanup(): void {
        window.removeEventListener(`${resEvtName}/${seq}`, resListener);
        window.removeEventListener(`${errEvtName}/${seq}`, errListener);
      }
      window.addEventListener(`${resEvtName}/${seq}`, resListener);
      window.addEventListener(`${errEvtName}/${seq}`, errListener);
      if (!opts?.wait) {
        setTimeout(() => {
          cleanup();
          reject(new Error(`${handlerName} request timeout`));
        }, REQUEST_TIMEOUT_MS);
      }
    });
  };
  return fn;
}