server.js

var http = require('http')
var url = require('url')
var fs = require('fs')
var path = require('path')
var baseDirectory = __dirname   // or whatever base directory you want

var port = 8080

http.createServer(function (request, response) {
    try {
        var requestUrl = url.parse(request.url)

        // need to use path.normalize so people can't access directories underneath baseDirectory
        var fsPath = baseDirectory+path.normalize(requestUrl.pathname)

        var fileStream = fs.createReadStream(fsPath)
        fileStream.pipe(response)
        fileStream.on('open', function() {
			 if ( requestUrl.pathname.endsWith('.wasm') )
				response.writeHead(200, { 'Content-type': 'application/wasm', 'Cross-Origin-Embedder-Policy': 'require-corp', 'Cross-Origin-Opener-Policy': 'same-origin' } )
			 else if ( requestUrl.pathname.endsWith('.js') )
				response.writeHead(200, { 'Content-type': 'text/javascript', 'Cross-Origin-Embedder-Policy': 'require-corp', 'Cross-Origin-Opener-Policy': 'same-origin' } )
			 else
				response.writeHead(200, { 'Cross-Origin-Embedder-Policy': 'require-corp', 'Cross-Origin-Opener-Policy': 'same-origin' } )
        })
        fileStream.on('error',function(e) {
             response.writeHead(404)     // assume the file doesn't exist
             response.end()
        })
   } catch(e) {
        response.writeHead(500)
        response.end()     // end the response so browsers don't hang
        console.log(e.stack)
   }
}).listen(port)