Closure form of DI

closureDi.js

//makeThumbnail.js

module.exports = function(db) {
  db = db || require('./database.js');
  return {
    start : function(input){
    // makeThumbnail
    // save timestamp
    db.save({...});
  }
};


//and it would be used like this in taskRunner.js and tests:

var db = require('./database.js'),
    makeThumbnail = require('./tasks/makeThumbnail')(db);
//End usage won't be cluttered with dependency injection with this.