text: const { series } = require('gulp');
  const del = require('delete')
  
  // The `clean` function is not exported so it can be considered a private task.
  // It can still be used within the `series()` composition.
  function clean(cb) {
    // body omitted
     del(['output/*.js'], cb);
    cb();
  }
  
  // The `build` function is exported so it is public and can be run with the `gulp` command.
  // It can also be used within the `series()` composition.
  function build(cb) {
    // body omitted
    cb();
  }
  
  exports.build = build;
  exports.default = series(clean, build);
  