Initial commit

assets/theme-template/THEMENAME.theme

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+<?php
+
+/**
+ * @file
+ * Functions to support theming in the THEMELABEL theme.
+ */
+
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Implements hook_preprocess_HOOK() for page templates.
+ */
+function THEMENAME_preprocess_page(&$variables) {
+  // Add custom variables or modify existing ones.
+}
+
+/**
+ * Implements hook_preprocess_HOOK() for node templates.
+ */
+function THEMENAME_preprocess_node(&$variables) {
+  /** @var \Drupal\node\NodeInterface $node */
+  $node = $variables['node'];
+
+  // Add custom variables based on node.
+}
+
+/**
+ * Implements hook_theme_suggestions_HOOK_alter() for page templates.
+ */
+function THEMENAME_theme_suggestions_page_alter(array &$suggestions, array $variables) {
+  // Add custom template suggestions.
+}
+
+/**
+ * Implements hook_form_alter().
+ */
+function THEMENAME_form_alter(&$form, FormStateInterface $form_state, $form_id) {
+  // Modify forms as needed.
+}