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/* xlsx.js (C) 2013-present SheetJS -- http://sheetjs.com *//* eslint-env node */const XLSX = require('xlsx');const assert = require('assert');const Firebase = require('firebase-admin');
const config = {	credential: {		getAccessToken: () => ({			expires_in: 0,			access_token: '',		}),	},	databaseURL: 'ws://localhost:5555'};
/* 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 Firebase server and initialize collection */P = P.then(async () => {	Firebase.initializeApp(config);	const database = Firebase.database();	await database.ref('foo').set(null);	return [database];});
/* Insert entire workbook object into `foo` ref */P = P.then(async ([database]) => {	await database.ref('foo').set(wb);	return [database];});
/* Change cell A1 of Sheet1 to "J" and change A2 to 5 */P = P.then(async ([database]) => {	database.ref('foo').update({		"Sheets/Sheet1/A1": {"t": "s", "v": "J"},		"Sheets/Sheet1/A2": {"t": "n", "v": 5},	});	return [database];});
/* Write to file */P = P.then(async ([database]) => {	const val = await database.ref('foo').once('value');	const wb = await val.val();	XLSX.writeFile(wb, "firebase.xlsx");	const ws = XLSX.readFile("firebase.xlsx").Sheets.Sheet1;	const csv = XLSX.utils.sheet_to_csv(ws);	assert.equal(csv, "J,b,c\n5,2,3\n");	console.log(csv);	return [database];});
/* Close connection */P = P.then(async ([database]) => { database.app.delete(); });