SharePoint Online Bulk Operation of 40000 item Insertion using Batch Utils.js

/*
Below code depends on two utility SPOHelper and BatchUtils

For SPOHelper  -> https://anomepani.github.io/posts/spohelper-sharepoint-online-rest-api-crud-operation-utility-with-example/
For BatchUtils -> https://anomepani.github.io/posts/make-batch-request-with-rest-api-in-sharepoint-online-sharepoint/

You can skip SPOHelper if you want and instead of that you can right your own logic to get Request digest pass to below methods
*/
//Step 1: Initial Setup

var rootUrl = "https://brsupport.sharepoint.com/sites/Training";
var reqUrl = rootUrl + "/_api/web/Lists/GetbyTitle('InsertList')/items";

//Step 2 : Prepare list of urls in array

var arr = [];
for (var index = 1; index <= 40000; index++) {
    //PREPAR ARRAY OF 40000 ITEM FOR BULK INSERTIONS
  arr.push({
    reqUrl: reqUrl,
    action: "ADD",
    data: { Title: "Article_" + index },
  });
}

//https://github.com/anomepani/sp-rest-util/blob/master/BatchUtils.ts
var processedCount=0;
CallBulkInsertOperations = (rootUrl, arr) => {
  //GET REQUEST BEFORE MAKING BATCH REQUESTS
  GetDigest(rootUrl+"/_api/contextinfo").then((r) => {
    console.log(r);
    var BatchOf100s = [];
    for (var startIndex = 0; startIndex <arr.length; startIndex++) {
      BatchOf100s.push(arr[startIndex]);

      if (BatchOf100s.length == 100) {
        CallBatchOperationUsingBatchUtils(rootUrl, BatchOf100s, r);
      
        //After Batch Of 100s record processed, Set Empty array for next array execution
        BatchOf100s = [];
      }
    }
  });
};
function CallBatchOperationUsingBatchUtils(rootUrl, BatchOf100s, r) {
//T
  setTimeout(() => {
    BatchUtils.PostBatchAll({
      rootUrl,
      batchUrls: BatchOf100s,
      FormDigestValue: r.FormDigestValue,
    }).then((r) => {
      console.log(r);
      console.log("Processed..=>" + BatchOf100s.length);
    }).catch(e=>{

        console.log(e,"Retry is error occurs due to 429 - Too Many Requests");

        setTimeout(()=>{
            CallBatchOperationUsingBatchUtils(rootUrl, BatchOf100s, r);
        },3000);
    });
  }, 1000);
}
//Uncomment below method to test
//CallBulkInsertOperations(rootUrl,arr);