Why do we need local and global angular-cli version?

local package will used from angular cli self. If you using ng on a terminal the global installation is used. To building by typescript files, i using the local cli installation.

1. If you use ng cmd in terminal, it will look into global packages instead of node_modules folder

( local installation ) e.g.

[email protected]:~/Desktop/myFirstApp$ ng serve -o

2. If you execute it through npm cmd like

   [email protected]:~/Desktop/myFirstApp$ npm start

and in package.json something like this

"scripts": {
  "ng": "ng",
  "start": "ng serve -o",
  "build": "ng build --prod",
  "test": "ng test",
  "lint": "ng lint",
  "e2e": "ng e2e",
  "deploy": "ng deploy",
  "build:stats": "ng build --stats-json",
  "analyze": "webpack-bundle-analyzer dist/app/stats-es2015.json"}

Then it will look into node_modules folder i.e. local installation

In both cases same cmd will be executed.