Add pipe condition

[henrytao-me]

Let's say I have a less task and I want to add sourcemaps depending on environment.

This is the original less task with no environment support:

gulp.task('less', function() {
  gulp.src('./dev/src/**/*.less')
    .pipe(sourcemaps.init())
    .pipe(less())
    .pipe(sourcemaps.write())
    .pipe(gulp.dest('./.tmp'));
});

This is the common solution:

gulp.task('less', function() {
  var res = gulp.src('./dev/src/**/*.less');
  if (env.DEBUG === 'yes') {
    res = res.pipe(sourcemaps.init());
  }
  res = res.pipe(less());
  if (env.DEBUG === 'yes') {
    res = res.pipe(sourcemaps.write());
  }
  res = res.pipe(gulp.dest('./.tmp'));
});

This is my proposed solution, more elegant (I think):

gulp.task('less', function() {
  gulp.src('./dev/src/**/*.less')
    .pipe(env.DEBUG === 'yes' ? sourcemaps.init() : null)
    .pipe(less())
    .pipe(env.DEBUG === 'yes' ? sourcemaps.write() : null)
    .pipe(gulp.dest('./.tmp'));
});

Overall idea:

If you add pipe like this:

gulp.task('less', function() {
  gulp.src('./dev/src/**/*.less')
    .pipe(null)
    .pipe(less())
    .pipe(null)
    .pipe(gulp.dest('./.tmp'));
});

Then it will execute like this:

gulp.task('less', function() {
  gulp.src('./dev/src/**/*.less')
    .pipe(less())
    .pipe(gulp.dest('./.tmp'));
});

[yocontra]

use gulp-if