New ES6 project with Babel, Browserify & Gulp

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/index.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('./build'));
  }

  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']);

question,
Why does anyone need watchify at all if you're already using gulp that comes with its own file watching built in?

I need to test this out but I believe you could rewrite the whole gulpfile to this:

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 babel = require('babelify');

gulp.task('build', function(){
  var bundler = browserify('./src/index.js', { debug: true }).transform(babel);

  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('./build'));
});

gulp.task('watch', function () {
  gulp.watch('./src/**/*.js', ['build']);
});

gulp.task('default', ['watch']);

@FranciscoG yes you are right! maybe it was needed since OP created this config based JS function instead gulp task. I have similar working configuration like yours at https://github.com/yeomann/GulPress/blob/master/gulpfile.js

@FranciscoG @yeomann http://stackoverflow.com/questions/35539851/difference-between-watchify-and-gulp-watch

Here's my take on it, hacked, slashed and smashed to bundle and watch multiple files working right. :)

https://gist.github.com/nicekiwi/ca575492dfd83504aced26892c559d58

More info on that in the gulp recipes here too:
https://github.com/gulpjs/gulp/blob/master/docs/recipes/browserify-multiple-destination.md

Here is mine, it does uglify & sourcemaps. It uses watchify for increment builds plus livereload to notify the browser.
https://gist.github.com/luv2code/77ddbc79c02d40194f929841d0696ebc

Thanks a lot. This works great.

However I added a return statement on line 13 and 29 to show that the build task is completed
Finished 'build' after 749 ms;

However, still, the batch process is not ending. I still have to press CTRL+C to exit this process. :\

can we see the package.json of these?