# node.js



[Node.js](https://nodejs.org/fr/)® est un environnement d’exécution JavaScript construit sur le [moteur JavaScript V8 de Chrome](https://developers.google.com/v8/).

[npm](https://www.npmjs.com) est un gestionnaire de paquets pour JavaScript automatiquement installé avec Node.

[nvm](https://github.com/creationix/nvm) (Node Version Manager) est un gestionnaire de version de Node.



### Installation (Homebrew):

```bash
# installer node et npm

$ brew install node
```



### Installation (directe):

Installer [Node.js](https://nodejs.org/en/download/) (version LTS)



### Installation ([nvm](nvm.md)):

```bash
$ brew install nvm

# installer Node 8
$ nvm install 8

# installer Node 10
$ nvm install 10
```



### npm

npm est un gestionnaire de paquets pour JavaScript automatiquement installé avec Node.

#### Version de npm:

```bash
# version:
$ node -v
v9.5.0
$ npm -v
5.6.0
```

 

#### Update:


```bash
$ npm install npm@latest -g

$ brew install node

$ npm install npm --global
```

https://docs.npmjs.com/getting-started/fixing-npm-permissions#option-2-change-npms-default-directory-to-another-directory



#### Local:

Installer npm packages localement => `/Users/bruno/Sites/node_modules`

- Installer: `npm install <package_name>`
- Mise-à-jour: `npm update` (depuis le répertoire du module)
- Desinstaller: `npm uninstall <package_name>`

<u>Mises à jour disponibles:</u>

```bash
bruno@silverbook:~/Sites/node_modules$ npm outdated
Package        Current  Wanted  Latest  Location
jquery         MISSING   3.2.1   3.2.1
livephotoskit   1.4.11   1.5.2   1.5.2
```

`npm outdated` montre plusieurs choses: 

1. Current: la version actuelle du module.
2. Wanted: la dernière version qui satisfait le semver ranges decrit dans le package.json 
3. Latest: la toutedernière version du module disponible sur npm.

<u>Mettre-à-jour:</u>

```bash
$ npm outdated | awk '{print $1}' | xargs npm update
```



#### Global:

Installer npm packages globalement => `/usr/local/lib/node_modules/`

- Installer: `npm install -g <package_name>`
- Mise-à-jour: `npm update -g <package_name>`
- Désinstaller: `npm uninstall -g <package_name>`



#### npm verb outdated not updating @angular/cli because it's currently at the maximum version that matches its specified semver range:

[Stackoverflow](https://stackoverflow.com/questions/39758042/npm-update-does-not-do-anything) [semver range](https://docs.npmjs.com/misc/semver#advanced-range-syntax)

```bash
$ npm update -g --verbose @angular/cli

npm verb outdated not updating rxjs because it's currently at the maximum version that matches its specified semver range
```



#### Plus info sur une commande:

```bash
# Mode verbose:
$ npm update -g --verbose

# Exécute la commande sans rien installer:
$ npm install -g --dry-run
```




#### Aller dans node_modules:

```bash
bruno@SilverBook:~$ cd Sites/node_modules/
```

puis

- Liste package installé: `npm ls`
- Mises à jour disponibles: `npm outdated`
- Installer une m-à-j: `npm update`
- Installer un package: `npm install package`
- Désinstaller un package: `npm uninstall package`



#### Supprimer tous les modules:

```bash
$ for package in `ls node_modules`; do npm uninstall $package; done;
```



#### Maintenance:

```bash
$ npm doctor
npm WARN verifyCachedFiles Content garbage-collected: 46 (4358853 bytes)
npm WARN verifyCachedFiles Cache issues have been fixed
Check                               Value                        Recommendation
npm ping                            OK
npm -v                              v5.10.0                      Use npm v6.4.1
node -v                             v8.11.4
npm config get registry             https://registry.npmjs.org/
which git                           /usr/bin/git
Perms check on cached files         ok
Perms check on global node_modules  ok
Perms check on local node_modules   ok
Verify cache contents               verified 2159 tarballs
```



#### Info sur un package:

```bash
$ npm show cli

# idem:
# npm info cli
# npm view cli

cli@1.0.1 | MIT | deps: 2 | versions: 59
A tool for rapidly building command line apps
http://github.com/node-js-libs/cli

keywords: cli, command line, opts, parseopt, opt, args, console, argsparse, optparse, autocomplete, command, autocompletion

dist
.tarball: https://registry.npmjs.org/cli/-/cli-1.0.1.tgz
.shasum: 22817534f24bfa4950c34d532d48ecbc621b8c14

dependencies:
exit: 0.1.2  glob: ^7.1.1

maintainers:
- cohara87 <cohara87@gmail.com>

dist-tags:
latest: 1.0.1

published over a year ago by cohara87 <cohara87@gmail.com>
```



#### Packages:

[Rechercher un package](https://npms.io)



##### uninstall-all-modules

Desinstaller tous les modules=

```bash
$ npm uninstall
```

##### livephotoskit, jquery, picturefill