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/* xlsx.js (C) 2013-present SheetJS -- http://sheetjs.com *//* eslint-env node *//* global Promise */const XLSX = require('xlsx');const assert = require('assert');const MongoClient = require('mongodb').MongoClient;
const url = 'mongodb://localhost:27017/sheetjs';const db_name = 'sheetjs';
/* make new workbook object from CSV */const wb = XLSX.read('a,b,c\n1,2,3', {type:"binary", raw:true});
let P = Promise.resolve("sheetjs");
/* Connect to mongodb server and initialize collection */P = P.then(async () => {	const client = await MongoClient.connect(url,{ useUnifiedTopology: true });	const db = client.db(db_name);	try { await db.collection('wb').drop(); } catch(e) {}	const coll = db.collection('wb');	return [client, coll];});
/* Insert entire workbook object as a document */P = P.then(async ([client, coll]) => {	const res = await coll.insertOne(wb);	assert.equal(res.insertedCount, 1);	return [client, coll];});
/* Change cell A1 of Sheet1 to "J" and change A2 to 5 */P = P.then(async ([client, coll]) => {	const res = await coll.updateOne({}, { $set: {		"Sheets.Sheet1.A1": {"t": "s", "v": "J"},		"Sheets.Sheet1.A2": {"t": "n", "v": 5},	}});	assert.equal(res.matchedCount, 1);	assert.equal(res.modifiedCount, 1);	return [client, coll];});
/* Write to file */P = P.then(async ([client, coll]) => {	const res = await coll.find({}).toArray();	const wb = res[0];	XLSX.writeFile(wb, "mongo.xlsx");	const ws = XLSX.readFile("mongo.xlsx").Sheets.Sheet1;	console.log(XLSX.utils.sheet_to_csv(ws));	return [client, coll];});
/* Close connection */P.then(async ([client]) => { client.close(); });