Angular: a command-line interface for Angular

Angular is a Javascript framework for creating the front end side using the MVC pattern. It was created in 2009 by Google and is becoming more and more popular. Thanks to Angular we will be able to speed up the work from the front end using a lot of Javascript functionalities perfectly organized. Its methodology is the SPA, i.e. single page application.

On the other hand, Angular is being widely used in a new stack called MEAN (MongoDB, ExpressJS, Angular and NodeJS) where you can create other types of web applications.

In order to have a tool to manage Angular better, it is that AngularCLI arises. Angular is a command-line interface for Angular, with it, we can create an application that already works, right out of the box.

So, if you use Angular or you want to learn about it, you have to install Angular.

Install Angular on Ubuntu 20.04 / Debian 10

AngularCLI requires for its operation that the system has NodeJS installed. So the first step is to install it. I recommend you to read our post about it:

How to install NodeJS on Debian 10?

How to install NodeJS on Ubuntu 20.04?

After it is correctly installed, we can install it using npm. So, you have to install it too.

:~$ sudo apt install npm

To do so, just use the following command:

:~$ sudo npm install -g @angular/cli

Then, create a new project using this tool:

:~$ ng new example-project

Now, you have to choose the slytesheet format.

This will create a new folder called example-project. Of course, you can change the name of the project. Access it and serve the project.

:~$ cd example-project 
:~$ ng serve 

This will make the application available at http://localhost:4200. Remember that this port has to be available in the firewall.

However, we can change those parameters and specify a port and a host.

:~$ ng serve --host [host_ip] --port [port]

When you open the browser and access your project, you will see the following:

So, Angular is ready to be used.

Conclusion

Developers need tools to help speed up projects. Well, with Angular we will have a terminal interface to manage this fantastic framework.

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Yarn is a Javascript dependency manager that stands out for being fast, secure and reliable. It is presented to us as the most solid alternative to NPM. In addition, it is open source and it has the protection of a giant like Facebook what guarantees us solidity and robustness of the project. Some of its characteristics are the following:

• Fast: Yarn caches every package it has downloaded.
• Reliable: Using a detailed but concise lockfile format and a deterministic algorithm for install operations.
• Secure: Yarn uses checksums to verify the integrity of every installed package before its code is executed.

There are also other features such as its efficiency in the use of the network as well as an offline mode. All this can be found on the Github site of Yarn.

So, let us start.

Install Yarn on FreeBSD 12

For this tutorial, you must have sudo enabled, so this is the first step.

How to enable sudo on FreeBSD 12?

After you can use sudo, you can continue.

The FreeBSD 12 repositories are quite large, so we will first look for yarn in them.

Open a terminal and run the following:

:~$ sudo pkg search yarn
yarn-1.19.1                    Package manager for node, alternative to npm
yarn-node10-1.19.1             Package manager for node, alternative to npm
yarn-node12-1.19.1             Package manager for node, alternative to npm
yarn-node8-1.19.1              Package manager for node, alternative to npm

As you can see in the picture, yarn is in the official repositories. And also, they have several versions according to the version of NodeJS we have installed.

However, to install it, just use the following command:

:~$ sudo pkg install yarn
Updating FreeBSD repository catalogue...
FreeBSD repository is up to date.
All repositories are up to date.
The following 6 package(s) will be affected (of 0 checked):

New packages to be INSTALLED:
	yarn: 1.19.1
	node: 13.3.0
	libnghttp2: 1.40.0
	c-ares: 1.15.0_1
	libuv: 1.34.0
	icu: 65.1,1

Number of packages to be installed: 6

The process will require 92 MiB more space.
19 MiB to be downloaded.

Proceed with this action? [y/N]:

Once it is installed, you can check the installed version.

:~$ yarn --version

This indicates that yarn is ready for action.

Basic use of Yarn

Now we will look at some basic steps in the use of yarn. I’m going to create a sample project, and for that I’ll first create a new dedicated folder.

:~$ mkdir project

Now I’ll access it:

cd project/

And within it, I initiate the yarn project. This will make me ask some questions about the configuration of the project. Nothing complicated.

:~$ yarn init
yarn init v1.19.1
question name (project): Example
question version (1.0.0): 
question description: This is an example
question entry point (index.js): 
question repository url: https://www.osradar.com/
question author: Angelo
question license (MIT): 
question private: no
success Saved package.json
Done in 34.27s.

If you want to add a new dependency, just use the following command:

:~$ yarn add [name]

Or to eliminate it:

:~$ yarn remove [name]

And from the project folder, we can install the rooms:

:~$ yarn

And so we can continue with the installation.

Conclusion

Yarn is a fantastic tool for Javascript developers and thus makes it easier to create functional web applications. Now you know how to install it on FreeBSD 12.

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Yarn is a new JavaScript package installer and dependency manager released by Facebook. Other companies such as Google have also collaborated. With yarn, the problems of library dependencies that a web project requires are solved. Normally, it’s done manually but it’s not optimal, that’s why Yarn solves this problem.

Yarn’s performance is quite similar to that of NPM which is its direct competitor. However, the performance is somewhat superior at Yarn. Some of Yarn’s key features are security and dependency resolution speed.

Install Yarn on CentOS 8

The first requirement is to install NodeJS. Remember that Yarn uses it as an engine in its operation.

Read, How to install NodeJS on CentOS 8?

In that post, you have several methods. Choose the best one for you. Then, continue the tutorial.

After this, the Yarn repository must be added. This is the fastest and easiest way to install it. It is also the safest way.

So, open a terminal and run:

:~$ su
:~# curl --silent --location https://dl.yarnpkg.com/rpm/yarn.repo | tee /etc/yum.repos.d/yarn.repo

Now, you can install Yarn on CentOS 8 by running the following command:

:~# dnf install yarn

Now, check the program version.

:~# yarn -v

Now, you can start to use yarn.

Conclusion

In this post, we have installed Yarn on CentOS 8. With this Javascript dependencies manager facilitates the creation of web projects that use many libraries as components of the application. All this in a fast and easy way.

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