How to install package with local path by NPM/Yarn

yarn add ./../your-project

npm install ../your-project

Get list of globally installed packages

Quick question: does everybody of you folks know the exact amount of globally installed npm packages in your workstation? Probably not.

This is especially true for NodeJS/npm newbies, who often try the most popular packages installing them globally, without even defining them in their package.json files; however, this may be useful even for more advanced NodeJS developer, who may not know every npm CLI trick.

So, this is it: npm list -g --depth 0

Let’s break this line down a little bit, shall we?

• npm: the Node package manager command line tool
• list -g: display a tree of every package found in the user’s folders (without the -g option it only shows the current directory’s packages)
• — depth 0 / — depth=0: avoid including every package’s dependencies in the tree view

Here’s a sample result:

debug

Installation

$ npm install debug

Usage

debug exposes a function; simply pass this function the name of your module, and it will return a decorated version of console.error for you to pass debug statements to. This will allow you to toggle the debug output for different parts of your module as well as the module as a whole.

Example app.js:

var debug = require('debug')('http') 
  , http = require('http') 
  , name = 'My App'; 
// fake app 
debug('booting %o', name); 
http.createServer(function(req, res){ 
  debug(req.method + ' ' + req.url); 
  res.end('hello\n'); 
}).listen(3000, function(){ 
  debug('listening'); 
});


// fake worker of some kind 
require('./worker');

Example worker.js:

var a = require('debug')('worker:a')
, b = require('debug')('worker:b');

function work() {
a('doing lots of uninteresting work');
setTimeout(work, Math.random() * 1000);
}
work();

function workb() {
b('doing some work');
setTimeout(workb, Math.random() * 2000);
}
workb();

The DEBUG environment variable is then used to enable these based on space or comma-delimited names.

Here are some examples:

  

cài đặt qua npm

mkdir video

cd video

npm init // để tạo file package.json

npm i video.js // sẽ tạo thư mục node_modules

touch video.html // ở đây ta có thể import các modules

npm