Create custom block programmatically

how to create a custom block in Drupal 10

https://www.youtube.com/watch?v=1x7ntRl3a74


How to create custom block programmatically in Drupal 9?

https://www.youtube.com/watch?v=49psk1jLpYE


How to embed inline javascript in Drupal, anywhere on any page

https://rikdeboer.medium.com/how-to-dynamically-embed-javascript-in-drupal-anywhere-on-any-page-3f9cd7e64d0c


class MyJavascriptBlock extends BlockBase {  public function build() {
    $js = \Drupal::config('mymodule.settings')->get('js_file_url')    $tag = '<script type="text/javascript" src="'.$js.'"></script>';    return [
      '#markup' => $tag,
      '#allowed_tags' => ['script'],
    ];
  }}

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