How do you removed unused JavaScript?

What does remove unused JavaScript mean?

Reducing unused JavaScript can reduce render-blocking behaviour to speed up your page load and improve your visitors’ page experience. By default, JavaScript files are render-blocking because they block the browser from dealing with other page load tasks, thus delaying your page’s First Paint.

How do I get rid of unused codes?

The quickest way to find dead code is to use a good IDE.

  1. Delete unused code and unneeded files.
  2. In the case of an unnecessary class, Inline Class or Collapse Hierarchy can be applied if a subclass or superclass is used.
  3. To remove unneeded parameters, use Remove Parameter.

How do I stop unused JavaScript in WordPress?

Go to “Asset CleanUp > Settings” menu and then to “Plugin Usage Preferences” tab. Here you can decide, the way you want to view and disable the unused CSS / scripts on your pages.

Where is unused js in WordPress?

You can use the newly released treemap from Pagespeed(Lighthouse) to see unused Javascript. Run a Pagespeed test and click “VIEW TREEMAP” and then “Unused Bytes” on the new page. The striped part is the unused bytes from that javascript file.

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How do I find unused JavaScript files in my website?

The Coverage tab in Chrome DevTools can help you find unused JavaScript and CSS code. Removing unused code can speed up your page load and save your mobile users cellular data.

How do I remove JavaScript from a website?

Open Chrome DevTools. Press Control+Shift+P or Command+Shift+P (Mac) to open the Command Menu. Start typing javascript , select Disable JavaScript, and then press Enter to run the command. JavaScript is now disabled.

Why dead code is bad?

Dead code adds unnecessary complexity to the codebase. It makes the codebase more difficult to understand and maintain in the long run. It impacts performance and security. In some cases, due to poor software engineering practices, dead code can “come back to life” and cause catastrophic failures.

Why should we remove unused code?

The chances that the unused code will ever be used again is very unlikely. With time that possibility of re-use diminishes. If code is to be removed and is considered important enough then the code can be branched off and documented.

Why you should remove unused code?

Reasons to remove it:

  • Less code, less bugs.
  • Less code is easier for others to digest.
  • It’s still under source control.

Can I delete JavaScript files?

You can not delete files with javascript for security reasons. However, you can do so with the combination of server-side language such as PHP, ASP.NET, etc using Ajax. Below is sample ajax call that you can add in your code. Using NodeJS you can use filestream to unlink the file also.

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How do I remove JavaScript from WordPress?

How to Remove Unused CSS JS Files in WordPress

  1. See what scripts are getting loaded on our site. In order to remove unused scripts, we should first find out what exactly gets loaded by the WordPress theme and plugins. …
  2. List all loaded scripts with wp_enqueue_script. …
  3. Remove unused CSS JS files in WordPress. …
  4. The entire plugin.

How do I remove unused JavaScript from Wix?

JavaScript files in Wix sites

JavaScript files are crucial to your site’s structure and, even though Google may flag them, they have no negative effect on your site. These files structure the backbone of your Wix site, so you cannot modify, manipulate, or delete them.

How do I get rid of unused CSS in HTML?

How to remove unused CSS manually

  1. Open Chrome DevTools.
  2. Open the command menu with: cmd + shift + p.
  3. Type in “Coverage” and click on the “Show Coverage” option.
  4. Select a CSS file from the Coverage tab which will open the file up in the Sources tab.

How do I block unused CSS in WordPress?

How to use the purified CSS code on your WordPress website

  1. Upload purified stylesheet. …
  2. Remove existing stylesheets. …
  3. Make sure all styles have been removed. …
  4. Remove inline styles if any exists. …
  5. Enqueue the purified CSS. …
  6. Test your changes thoroughly! …
  7. Adjust purified CSS code.

How do I remove unused JavaScript from Shopify?

Remove unused CSS and unused JS:

  1. Check assets folder of the theme and remove unused CSS and JS file.
  2. Check and remove unused apps.
  3. If your store has not install any app you can comment {{ content_for_header }} code in theme. liquid (not recommended if you don’t have a knowledge about the liquid)
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