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I want to ship a default image in my custom module. I know I can reference images in the files directory with public://, but how can I properly reference my module's URL path?

Update: I need to pass this URI to image_style so a raw path to the module directory won't be enough:

  $render_image = [
    '#theme' => 'image_style',
    '#style_name' => 'blah',
    '#uri' => $uri,
    ...
  ];
  • Get the relative path to your module using the module manager service. – Eyal Jun 6 '16 at 21:29
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The \Drupal class has many useful static functions such as moduleHandler. I recommend (for future issues) to first search there, then in the core.services.yml & system.services.yml files for a service or a method that could help.

\Drupal::moduleHandler()->getModule('foo')->getPath()
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I think following is easy method to do this

Create private file path

$settings['file_private_path'] = 'give path to you /private-files'; \Drupal::service('file_system')->realpath("private://");

Now you can use this to upload your module related file also custom file for custom form.

Ref: https://www.drupal.org/docs/8/modules/skilling/installation/set-up-a-private-file-path

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