gulp + browserify + vinyl-transform

gulpfile.js

var gulp = require('gulp');
var browserify = require('browserify');
var babelify = require('babelify');
var transform = require('vinyl-transform');

gulp.task('browserify', function() {
    gulp.src('./app.js')
        .pipe(transform(function(filename){
            return browserify(filename, {debug: true})
                .transform(babelify)
                .bundle();
        }))
        .pipe(gulp.dest('./dist/'));
});