use pipelines with gulp

after.js

var buffer = require('vinyl-buffer');
var source = require('vinyl-source-stream');
var browserify = require('browserify');
var uglify = require('gulp-uglify');

gulp.task('index', function(){
  var bundler = browserify('newstimeline/livescript/index.ls');
  bundler.transform('browserify-livescript');

  return bundler.bundle({insertGlobals: true})
    .pipe(source('index.js'))
    .pipe(buffer())
    .pipe(uglify()) // just an example, remove if you dont need it
    .pipe(gulp.dest('newstimeline/static/js'));
});

gulp.task('management', function(){
  var bundler = browserify('newstimeline/livescript/management.ls');
  bundler.transform('browserify-livescript');

  return bundler.bundle({insertGlobals: true})
    .pipe(source('management.js'))
    .pipe(buffer())
    .pipe(uglify())  // just an example, remove if you dont need it
    .pipe(gulp.dest('newstimeline/static/js'));
});
gulp.task('default', ['index', 'management']);

before.js

var gulp = require('gulp');
var ls = require('gulp-livescript');
var browserify = require('gulp-browserify');

gulp.task('ls', function() {
        return gulp.src('newstimeline/livescript/*.js')
                .pipe(ls({bare: true}))
                .pipe(gulp.dest('build/js/'))
});

gulp.task('index', ['ls'], function() {
        return gulp.src('build/js/index.js')
                .pipe(browserify({insertGlobals : true}))
                .pipe(gulp.dest('newstimeline/static/js/'))
});

gulp.task('management', ['ls'], function() {
        return gulp.src('build/js/management.js')
                .pipe(browserify({insertGlobals : true}))
                .pipe(gulp.dest('newstimeline/static/js/'))
});

gulp.task('default', ['index', 'management']);