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Introduction to Rails Webpacker

Web development, programming languages, Software testing & others

Usage of Rails Webpacker

Some among the major usage necessities attested by webpacker utility will be as follow,

Help faster restart of development and deployment servers.

Allows javascript changes to be reflected without the necessity to restart the utilized webservers on every instance.

Brings in a large extent of code arrangement, which will be helpful in sophisticatedly organizing the entire code maintenance process. Importantly the code mentioned here represents javascript front-end files.

Allows keeping your website largely interactive.

It allows the flexibility to manage and bundle independent files like .html, .javascript, and .css into a single bundle and execute them easily.

How to Install Rails Webpacker?

Let’s discuss further the process of how webpacker has been installed. Webpacker is a tool that connects the rails application with all the HTML code to the webpack. This connectivity simplifies configuring and developing javascript applications and makes them suitable for the production environment. The source code of the webpacker will be associated as a gem file; also, a development server comes in associated with a server. This is a development server that helps keep the development process very fast; this capability is achieved since there is not necessary to kick and take the server on and stop the server on every instance of a change induced in the javascript files.

Let’s see below how the webpacker is set up. Webpacker is available for installation in the latest rails version. The command for installation of the webpacker will be

Command: webpacker:install

How to Create Rails Webpacker?

In the process of creating a webpacker, it will include the below-given set of files to be generated in the background. The webpacker installation will organize the files in the below manner,

config/webpacker.yml

Source_path The location where all the javascript files are given is mentioned here. The default value is app/javascript, and there may be no necessity to change the value intentionally.

public_root_path The path that is accessible from the browser is given here.

public_output_path While compiling the webpacker files, all the compiled files will be pushed into the public_output_path.

webpack_compile_output All the output files will be compiled when the flag is true.

config/webpacker/

All the javascript-based configurations are created in this folder location. The packs associated will be located under the location app/javascript/packs. Each pack file will be a webpacker when the compilation process is kickstarting. We can notice from the below-given file that the first line is used for importing the given library; a search will be initiated in the background, which will be needed. With the usual approach, initialization may not be needed as the initialization process will occur when the page source with the script tag is included.

Sample Webpackerfile:

bin/webpack bin/webpack-dev-server

This is again an executable file intended for kickstarting the server, which will be responsible for loading the webpacks within the javascript bundle. The process of running the server consists of five major steps below,

Setting environment The name of the environment and the rails has been set. If no environment is not specified, then the development environment will be taken as the assumption.

Loading Configuration webpacker.yml is allowed to be loaded as the next step

Validation command options This checks if correct options have been passed as the server command. If an incorrect option is passed, an error will be thrown.

Verifying ports availability Determining whether the port is available for use or not. This is used to help synchronous availability checks of the ports. For example, when a different program has used one specific port, the process will have an error on port unavailability. This unavailability will be captured.

web pack command to serve When the directory modules exist, the program will execute the command in the directory, or else the command will be executed in yarn.

Webpack server execution sample screen snap:

Conclusion

The above-given article clearly explains how web maker is used in rails. It also explains how webpacker can be used to execute rails. What are its key applications of it? Also, there are explanations of the different processes involved in the installation and the directory structure post-installation for code maintenance.