old_contents: var
    argv   = require('yargs').alias('s', 'self'),
    cached = require('gulp-cached'),
    concat = require('gulp-concat'),
    debug  = require('gulp-debug'),
    gulp   = require('gulp'),
    queue  = require('streamqueue'),
    uglify = require('gulp-uglify');
  
  gulp.task('make:js', function() {
     console.log('Minifying JavaScript…');
  
     return queue({ objectMode: true },
         gulp.src('./src/js/functions.js'),
         gulp.src('./src/js/dropbox.js'),
         gulp.src('./src/js/keyboard.js'),
         gulp.src('./src/js/modal.js'),
         gulp.src('./src/js/search.js'),
         gulp.src('./src/js/table.js'),
         gulp.src('./src/js/init.js')
      )
     .pipe(concat('listr.min.js'))
     .pipe(uglify())
     .pipe(gulp.dest('build/assets/js/'));
   });
  
new_contents: var
    argv   = require('yargs').alias('s', 'self'),
    cached = require('gulp-cached'),
    concat = require('gulp-concat'),
    debug  = require('gulp-debug'),
    gulp   = require('gulp'),
    queue  = require('streamqueue'),
    uglify = require('gulp-uglify');
  
  gulp.task('make:js', function() {
     console.log('Uglifying Listr JavaScript…');
  
     return queue({ objectMode: true },
         gulp.src('./src/js/functions.js'),
         gulp.src('./src/js/dropbox.js'),
         gulp.src('./src/js/keyboard.js'),
         gulp.src('./src/js/modal.js'),
         gulp.src('./src/js/search.js'),
         gulp.src('./src/js/table.js'),
         gulp.src('./src/js/init.js')
      )
     .pipe(concat('listr.min.js'))
     .pipe(uglify())
     .pipe(gulp.dest('build/assets/js/'));
   });
  
  gulp.task('make:bootstrap', function() {
     console.log('Uglifying Bootstrap JavaScript…');
  
     return queue({ objectMode: true },
         // gulp.src('./node_modules/bootstrap/js/src/util.js'),
         gulp.src('./node_modules/bootstrap/js/src/alert.js'),
         gulp.src('./node_modules/bootstrap/js/src/button.js'),
         gulp.src('./node_modules/bootstrap/js/src/dropdown.js'),
         gulp.src('./node_modules/bootstrap/js/src/modal.js')
      )
     .pipe(concat('bootstrap.min.js'))
     // .pipe(uglify())
     .pipe(gulp.dest('build/assets/js/'));
   });
  
subject: add (unused) task)