S3FS Node and Express, s3fsImpl is not defined - node.js

Question

I am trying to put a file into a s3 bucket from my node server using a post request in node.js. Here is the part of my node server that sets up the routes.
// Get Dependencies
const express = require('express');
const path = require('path');
const http = require('http');
const bodyParser = require('body-parser');
// Get API Routes
const api = require('./server/routes/api');
const app = express();
// Parse for POST data
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
// post static path to dist
app.use(express.static(path.join(__dirname,'dist')));
// Set our api routes
app.use('/api', api);
Here is api.js
const express = require('express');
const router = express.Router();
var fs = require('fs');
var S3FS = require('s3fs');
var s3fsImp1 = new S3FS('bucketname',{
accessKeyId: 'xxxxxxxxx',
secretAccessKey: 'xxxxxxxxxxxx'
});
router.get('/',(req,res) => {
res.status(200).json({ message: 'Connected!' });
});
router.post('/upload',(req,res) => {
var file = req.body.file;
console.log(file);
var stream = fs.createReadStream(file)
return s3fsImpl.writeFile(file,stream).then(function(){
fs.unlink(file,function(err){
if(err)
console.error(err);
});
res.send('done');
}).catch(function (err) {
return res.status(500).send({
message: errorHandler.getErrorMessage(err)
});
});
});
module.exports = router;
Node throws the error ReferenceError: s3fsImpl is not defined when I call that post method from postman. Any help would be appreciated.