index.js

import { ArcGISIdentityManager } from "@esri/arcgis-rest-request";
import {
  createItem,
  addItemPart,
  commitItemUpload
} from "@esri/arcgis-rest-portal";
import { readFileSync } from "fs";
import { Blob } from "buffer";

const getIdentity = async () =>
    await ArcGISIdentityManager.signIn({
        username: "REPLACE_ME***********************************************************",
    password: "REPLACE_ME***********************************************************"
    });

const auth = await getIdentity();

const file = readFileSync('./test.geojson');

const fileBlob = new Blob([new Uint8Array(file).buffer], {
    type: 'application/geo+json',
});

const item = await createItem({
    item: {
        title: 'Hello World',
        type: 'GeoJson',
    },
    authentication: auth,
    multipart: true,
    filename: 'test.geojson',
    async: true,
    overwrite: true,
});

console.log('item.id', item.id);

// // Note: You can add params: { f: 'text' } to see the HTML response
const part = await addItemPart({
    id: item.id,
    file: fileBlob,
    partNum: 1,
    authentication: auth,
});

// const commit = await commitItemUpload({
//     item: { title: 'Hello World', type: 'GeoJson' },
//     id: part.id,
//     authentication: auth,
// });