Initial commit

asc_book_override.info.yml

+name: ASC Book Override
+description: "Modifies Book form settings"
+package: ASC Tech
+
+type: module
+core_version_requirement: ^10
+
+dependencies:
+  - drupal:book

asc_book_override.install

+<?php
+function asc_book_override_install()
+{
+    module_set_weight('asc_book_override', 1);
+}

asc_book_override.module

+<?php
+function asc_book_override_form_node_form_alter(&$form, &$form_state, $form_id)
+{
+  if ($form_id === "node_newsletter_issue_form" || $form_id === "node_newsletter_article_edit_form") {
+
+    $form['book']['#title'] = t('Newsletter outline');
+    $form['book']['bid']['#title'] = t('Newsletter');
+    $form['book']['bid']['#description'] = t('Your page will be a part of the selected newsletter.');
+    $form['book']['parent_depth_limit']['#value'] = 2;
+    $form['book']['pid']['#prefix'] = '<div id="edit-book-plid-wrapper">';
+    $form['book']['bid']['#options']['new'] = t('- Create a new newsletter -');
+  } else {
+    unset($form['book']);
+  }
+}

composer.json

+{
+  "name": "asc-web-services/asc_book_override",
+  "type": "drupal-module"
+}