How do I add a script just above the closing body tag?

How do I add a script on Drupal 8 site/app just above closing body tag?

Vendor provided some JS in the following form:

<script>     ... code </script> 

Asked me to place immediately above </body>.

The script was only to run for Anonymous traffic.

Here’s how I did it:

THEME = name of your theme

  1. Removed <script> and </script> from code
  2. Minified using https://javascript-minifier.com/
  3. Created file name-of-my-script.min.js
  4. Uploaded to THEME/js/custom/name-of-my-script.min.js
  5. Added library to bottom of THEME.libraries.yml
name-of-my-library:   version: 1.0   js:     js/custom/name-of-my-script.min.js: {preprocess: false} // {preprocess: false} is responsible for code showing up above </body> 
  1. Added the following code to THEME.theme to an already existing function: function THEME_preprocess_page(&$variables) {}
$logged_in = $variables['logged_in'];     if (!$logged_in) {     $variables['#attached']['library'][] = 'THEME/name-of-my-library'; } 
  1. Cleared cache.

Resourses that helped:

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How do I add a script just above the closing body tag?

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