bson serialization and deserialization

bson.deserialize.js

const BSON = require('bson');
const fs = require('fs');
const bson = new BSON();
const file = './test.bson';
const bf = fs.readFileSync(file);
const len = bf.length;
let bfIdx = 0;
const items = [];
console.log('idx',bfIdx,len);
while(bfIdx < len){
	console.log('bfiDX',bfIdx);
	bfIdx = bson.deserializeStream(bf,bfIdx,1,items,items.length);
	console.log('items',items);
}

bson.serialize.js

const BSON = require('bson');
const MAXSIZE = 1024 * 1024 * 17;

const fs = require('fs');
const bson = new BSON();
const file = './test.bson';
let bf = new Buffer(MAXSIZE);
const data = [{
	a:1,
	b:new Date('2019-01-01')
},{
	a:2,
	b:new Date('2019-01-02')
},{
	a:3,
	b:new Date('2019-01-03')
}];

const chunks = [];
data.forEach((item,i)=>{
	console.log(item,i);
	const doc = Buffer.from(bson.serialize(item));
	chunks.push(doc);
});
bf = Buffer.concat(chunks);
console.log(bf.length);
fs.writeFileSync(file,bf);