gulpfile.js

var gulp = require('gulp');
var sourcemaps = require('gulp-sourcemaps');
var source = require('vinyl-source-stream');
var buffer = require('vinyl-buffer');
var browserify = require('browserify');
var watchify = require('watchify');
var babel = require('babelify');

function compile(watch) {

  var bundler = watchify(browserify('src/main.js', { debug: true }).transform(babel));

  function rebundle() {
    bundler.bundle().on('error', function (err) {
      console.error(err);this.emit('end');
    }).pipe(source('build.js')).pipe(buffer()).pipe(sourcemaps.init({ loadMaps: true })).pipe(sourcemaps.write('./')).pipe(gulp.dest('./dist'));
  }

  if (watch) {
    bundler.on('update', function () {
      console.log('-> bundling...');
      rebundle();
    });
  }

  rebundle();
}

function watch() {
  return compile(true);
};

gulp.task('build', function () {
  return compile();
});
gulp.task('watch', function () {
  return watch();
});

gulp.task('default', ['watch']);
//# sourceMappingURL=gulpfile.js.map