What is unused JavaScript?

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 fix unused JavaScript?

3. Remove unused JavaScript

  1. Step 1: Install Asset CleanUp Or Perfmatters. …
  2. Step 2: Enable Test Mode If Using Asset CleanUp.
  3. Step 3: Enable The Script Manager If Using Perfmatters.
  4. Step 4: Disable JavaScript Files Where They Don’t Need To Load.

How do I reduce unused js in react?

How to remove unused JavaScript

  1. Detect unused JavaScript. The Coverage tab in Chrome DevTools can give you a line-by-line breakdown of unused code. …
  2. Build tool for support for removing unused code. Check out the following Tooling. …
  3. Angular. …
  4. Drupal. …
  5. Joomla. …
  6. Magento. …
  7. React. …
  8. WordPress.

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.
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How do I know if I have unused CSS?

How to detect unused CSS # The Coverage tab of Chrome DevTools can help you discover critical and uncritical CSS. See View used and unused CSS with the Coverage tab. Chrome DevTools: Coverage tab.

How do I manually remove unused CSS?

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 you remove unused js from a site?

Unminify JavaScript and CSS in your browser

  1. Open Chrome DevTools. Control + Shift + I. …
  2. Open the Command Menu. Control + Shif t +P. …
  3. Type + click the following: “Show Coverage”
  4. Click the reload button to reload the page and to see which code is loaded.
  5. Then double click on the JS or CSS file that you want to unminify.

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.

How do I remove unused packages from JSON?

json. To identify the unused package, just run npx depcheck in the project root directory. Next step is to uninstall the npm packages using npm uninstall command. The post Remove unused npm modules from package.

How do I remove unused dependencies in react?

How to Remove Unused Dependencies in React

  1. Introduction.
  2. Impact of Using Dependencies.
  3. Using depcheck to Track Dependencies.
  4. Using npm-check to Track Dependencies.
  5. Uninstalling Packages Using npm uninstall.
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How do I remove unused npm packages?

Steps to Remove unused packages from Node.js

  1. First, remove the npm packages from packages. …
  2. To remove any specific node package run the command npm prune <pkg>
  3. run the npm prune command to remove unused or not required node packages from Node.js.

Should you remove dead code?

It is safe to remove code that you might need in the future. You can always get it back from version control. … As in previous chapters, remember to remove dead code as a single step; do not conflate it in a version control check-in that also adds functionality.

What is the difference between dead code and unreachable code?

MISRA C defines unreachable code as code that cannot be executed, and it defines dead code as code that can be executed but has no effect on the functional behavior of the program.

Why should you remove dead code?

Dead or commented code is like false trail signs that only confuse people, so avoid it at all costs. Unused code is a bigger search space for both you to read through and anything else that generally scans your code.

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