Sample usage of Knifecycle

knifecycle-sample.js

  import { Knifecycle, constant, autoService, autoProvider } from 'knifecycle';

  // Initialize the injector
  const $ = new Knifecycle();

  // Declare constants
  $.register(constant('FTP_CONFIG', { user: 'test', password: 'test' }));
  $.register(constant('DB_CONFIG', { user: 'test', password: 'test' }));

  // Declare services
  $.register(autoService(async function initFileServer({ FTP_CONFIG }) {
    let fileServer;
    
    // Actual initialization code 

    return fileServer;
  }));

  // Declare providers
  $.register(autoProvider(async function initDatabase({ DB_CONFIG }) {
    let database;
    
    // Returning a structure describing the provider service and disposal
    return {
      service: database,
      dispose: async () => {
        // Do whatever needed to shut the db down properly here
      },
    };
  }));

  // Initialize root dependencies
  $.run(['fileServer', 'database', '$shutdown'])
  .then(({ fileServer, database, $shutdown }) => {
    // Do the actual program work here

    // Shutdown properly the process (will call dispose on every providers in order)
    // Useful for graceful stop
    return $shutdown();
  });