Browserify + Uglify + Espruino using Gulp

gulpfile.js

var gulp = require("gulp"),
	browserify = require("browserify"),
	source = require("vinyl-source-stream"),
	buffer = require("vinyl-buffer"),
	uglify = require("gulp-uglify"),
	through = require("through2"),

	port = "/dev/cu.wchusbserial410",
	espruino = require("node-espruino").espruino({comPort: port});

var upload = through.obj(function(file, enc, done) {
	if (file.isNull()) return done(null, file);
	if (file.isStream()) throw new Error('no support');

	espruino.open(function() {
		espruino.upload(file.contents.toString(), {save: true}, function() {
			espruino.close(function() {
				done(null, file);
			});
		});
	});
});

gulp.task("upload", function() {
	return browserify({entries: ["./index.js"]})
		.bundle()
		.pipe(source())
		.pipe(buffer())
		.pipe(uglify())
		.pipe(upload);
});

gulp.task("default", ["upload"]);