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How to set variable for all theme templates in Drupal 8?

I want to set few global variables which I need to be available in all my theme’s Twig templates in Drupal 8.

Drupal 7 documentation mentions preprocess function:

themeName_preprocess This one is named after the theme itself. Applies to all hooks.

So I added the function below to my themename.theme file, but the variables aren’t set.

function themename_preprocess(&$variables) {   $theme_path = $variables['base_path'] . $variables['directory'];   $variables['theme_path'] = $theme_path;   $variables['images_path'] = $theme_path . "/images/";   $variables['templates_path'] = $theme_path . "/templates/"; }

When instead of defining themename_preprocess I define themename_preprocess_page (below) the variables are properly defined and available in page.html.twig template. I also tried defining template_preprocess(), but got error PHP Fatal error: Cannot redeclare template_preprocess() (previously declared in /home/robert/programming/dns-drupal/core/includes/theme.inc:1202).

function themename_preprocess_page(&$variables) {   $theme_path = $variables['base_path'] . $variables['directory'];   $variables['theme_path'] = $theme_path;   $variables['images_path'] = $theme_path . "/images/";   $variables['templates_path'] = $theme_path . "/templates/"; }

But I want the variables to be available in all templates instead of only page.html.twig. How can I do that?

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How to set variable for all theme templates in Drupal 8?

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