Node

http://www.js-attitude.fr/2014/09/22/libs-javascript-front/

top-10-mistakes-node-developers-make

grunt “The Javascript Task Runner”

JS Attitude

Node Package Manager

Au 11/12/2016 le site npm propose plus de 350.000 packages !

Affichage de la liste des packages globaux

npm list -g –depth=0

Affichage de la liste des packages locaux

npm list –depth=0

https://nodesource.com/blog/installing-node-js-tutorial-using-nvm-on-mac-os-x-and-ubuntu/

express “Fast, unopinionated, minimalist web framework”

Framework de base pour un projet web.

Nodemon is a utility that will monitor for any changes in your source and automatically restart your server. Perfect for development.

http://nodemon.io/

Voir aussi : forever

reloadify encapsule chokidar

Magique: Permet au server de demander au client de recharger une page quand une vue change.

Pour cela il utilise inject-html

var app = express();
// .....
var reloadify = require('reloadify')([path.join(__dirname, 'views'), path.join(__dirname, 'less')]);
app.use(reloadify);
// plus loin, après le démarrage du server
// serve an empty page that just loads the browserify bundle
app.get('/', function(req, res) {
  res.render('home');
});

debug Assez basique, mais efficace.

Dans un module :

var debug = require('debug')('mon-module');
.....
debug('myvar: '+myvar);
.....

Pour activer/désactiver le debug des modules depuis un shell:

export DEBUG='mon-module, mon-autre-module....'

pug (replace jade)

Template language exemple :

doctype html
html(lang="en")
  head
    title= pageTitle
    script(type='text/javascript').
      if (foo) bar(1 + 5)
  body
    h1 Pug - node template engine
    #container.col
      if youAreUsingPug
        p You are amazing
      else
        p Get on it!
      p.
        Pug is a terse and simple templating language with a
        strong focus on performance and powerful features.

mocha “Mocha is a feature-rich JavaScript test framework running on Node.js and in the browser, making asynchronous testing simple and fun.”

• Créer un dossier test à la récine du projet

• Modifier le package.json pour include les test mocha

//............
"scripts": {
   "start": "node app",
   "test": "mocha"
},
//............

• créer un test

var assert = require('assert');
describe('Array', function() {
  describe('#indexOf()', function() {
    it('should return -1 when the value is not present', function() {
      assert.equal(-1, [1,2,3].indexOf(4));
    });
  });
});

• exécuter les tests

> npm test

chai “Chai is a BDD / TDD assertion library for node and the browser that can be delightfully paired with any javascript testing framework.”

sinon “Standalone test spies, stubs and mocks for JavaScript. No dependencies, works with any unit testing framework.”

⇒ npm sinon

istambul “a JS code coverage tool written in JS”

karma “Spectacular Test Runner for JavaScript. ” utilise istanbul

underscorejs origine: CoffeeScript et Backbone

Utilitaire général : A voir

bunyan

Exemple:

var bunyan = require('bunyan');
global.log = bunyan.createLogger({
   name: 'GaGaZ',
   streams: [{
      level: 'info',
      type: 'rotating-file',
      path: __dirname+'/log/app.log',
      period: '1d',   // daily rotation
      count: 3        // keep 3 back copies
   },
   {
      level: 'error',
      type: 'rotating-file',
      path: __dirname+'/log/app-errors.log',
      period: '1d',   // daily rotation
      count: 3        // keep 3 back copies
   }]
});

//.............................................
log.trace('hi on trace');   // Level 10
log.debug('hi on debug');   // Level 20 
log.info('hi on info');     // Level 30
log.warn('hi on warn');     // Level 40
log.error('hi on error');   // Level 50
log.fatal('hi on fatal');   // Level 60

http://browserify.org/

Browserify lets you require('modules') in the browser by bundling up all of your dependencies.

Divers outils qui permettent de mieux maitriser les problématiques asynchrones.

async Async is a utility module which provides straight-forward, powerful functions for working with asynchronous JavaScript.

'use strict';
var async = require("async");

function makeLoopFunction(label, val) {
	return function(callback) {
		// console.log(label+val);
		return callback(null, {'val': val, 'label': label});
	};
}

function done (err, result) {
	console.log('cbk done: '+result.length);
	console.log(result);
}

var funcs = [];
for(var i = 0; i < 3; i++) {
	funcs.push(makeLoopFunction('test 5: ', i));
}
async.parallel(funcs, done);
// cbk done: 3
// [ { val: 0, label: 'test 5: ' },
//   { val: 1, label: 'test 5: ' },
//   { val: 2, label: 'test 5: ' } ]

co generator async control flow goodness

bluebird est une implementation des 'promise' javascript.

'use strict';
var Promise = require('bluebird');

function sleep(milliseconds) {
  var start = new Date().getTime();
  for (var i = 0; i < 1e7; i++) {
    if ((new Date().getTime() - start) > milliseconds){
    	console.log('sleep: '+milliseconds);
    	return milliseconds;
    }
  }
}

Promise.all([sleep(30), sleep(60)])
.then(function(res){
	console.log(res);
});
// sleep: 30
// sleep: 60
// [ 30, 60 ]

• Electron (ex Atom shell): http://github.com/electron/electron ou http://electron.atom.io/
  • Exemples: https://github.com/hokein/electron-sample-apps

• NW.js (ex Node webkit): http://nwjs.io/

Electron vs NW.js

Permet d'exécuter des commandes systèmes.

https://medium.freecodecamp.org/node-js-child-processes-everything-you-need-to-know-e69498fe970a

http://pm2.keymetrics.io/