old_contents: 'use strict';
  
  import fs          from 'fs';
  import onlyScripts from './util/scriptFilter';
  
  const tasks = fs.readdirSync('./gulp/tasks/').filter(onlyScripts);
  
  tasks.forEach((task) => {
    require('./tasks/' + task);
  });
new_contents: 'use strict';
  
  import gulp        from 'gulp';
  import fs          from 'fs';
  import onlyScripts from './util/scriptFilter';
  
  const tasks = fs.readdirSync('./gulp/tasks/').filter(onlyScripts);
  
  tasks.forEach((task) => {
    require('./tasks/' + task);
  });
  
  gulp.task('default', ['dev']);
  
subject: Add dev as default gulp task