Updates a SharePoint listitem in parallel using PnPJS with retry capability if error 409 (item has been updated by another user or process) occurs

SharePoint PnPJS Parallel ListItem Update with Retry

/*
  Hit 'ctrl + d' or 'cmd + d' to run the code, view console for results
*/
import { sp } from "@pnp/sp/presets/all";

( async () => {
  console.clear();
  const itemId = 89;

  const RetryHttpCall = async (fnToCall: () => Promise<any>, label: string, delayStart: number, maxTryCount: number): Promise<any> => {
    return new Promise( (resolve, reject) => {
      setTimeout( async () => {

        let tryCount = 1;
        while (true && (tryCount < 99)) {
          try {
            console.log(`Start update attempt: ${label}... (${tryCount})`);
            const response = await fnToCall();
            console.log(`After update attempt: ${label}... (${tryCount}) response::>`, JSON.stringify(response));
            resolve({
              label: `Update ${label}`,
              response: response
            });
            break;
          } catch (error) {
            /**
             * error = { "response": HttpRequest, "status": number, "statusText": string, "message": string; "isHttpRequestError": boolean }
             */
            window["pnperror"] = error;
            console.error(`Error update attempt: ${label}... (${tryCount})`, error.status);
            console.error(`Error update attempt: ${label}... (${tryCount})`, error);
            if ((tryCount >= maxTryCount) || ( (error.status !== 500) && (error.status !== 409) && (error.status !== 429) ) ) {
              reject(error);
              break;
            }
            tryCount++;
          }
        }
      }, delayStart);
    });
  };
  
  const call1 = () => sp.web.getList("/sites/eelhrportaldev/Lists/StaffUserPermissions").items.getById(itemId).update({ "eelhrPermissionstatusEES": `Pending` });
  const call2 = () => sp.web.getList("/sites/eelhrportaldev/Lists/StaffUserPermissions").items.getById(itemId).update({ "eelhrPermissionstatusCH": `Pending` });
  try {
    const updateResponses = await Promise.all([
      RetryHttpCall(call1, "eelhrPermissionstatusEES", 0, 3), 
      RetryHttpCall(call2, "eelhrPermissionstatusCH", 0, 3), 
    ]);
    console.log("Promises.all response::>", updateResponses);
  } catch (error) {
    console.log("error.status (1) ::> ", error.status);
    console.log(error);
  }  

} )().catch( (error) => {
  console.log("error.status (2) ::> ", error.status);
  console.log(error);
});