Modules could previously (and preferably) create new node types by implementing hook_node_info(). However, as part of the conversion of node type and field definitions to CMI, hook_node_info() has been removed. Use node_type_save() in hook_install() instead.

Previous in node_example.module:

<?php
/**
 * Implements hook_node_info().
 *
 * We use hook_node_info() to define our node content type.
 */
function node_example_node_info() {
 
// We define the node type as an associative array.
 
return array(
   
'node_example' => array(
     
'name' => t('Example Node Type'),
     
// 'base' tells Backdrop the base string for hook functions.
      // This is often the module name; if base is set to 'mymodule',
      // Backdrop would call mymodule_insert() or similar for node
      // hooks. In our case, the base is 'node_example'.
     
'base' => 'node_example',
     
'description' => t('This is an example node type with a few fields.'),
     
'title_label' => t('Example Title'),
     
// We'll set the 'locked' attribute to TRUE, so users won't be
      // able to change the machine name of our content type.
     
'locked' => TRUE,
    ),
  );
}
?>

Now, in node_example.install:

<?php
/**
 * Implements hook_install().
 */
function node_example_install() {
 
$node_example_node_type = array(
   
'type' => 'node_example',
   
'name' => t('Example Node Type'),
   
'base' => 'node_content',
   
'description' => t('This is an example node type with a few fields.'),
   
'custom' => 1,
   
'modified' => 1,
   
'locked' => 0,
   
'is_new' => TRUE,
   
'settings' => array(
     
'promote_enabled' => FALSE,
    ),
  );

 
$node_example_node_type = node_type_set_defaults($node_example_node_type);
 
node_type_save($node_example_node_type);
 
node_add_body_field($node_example_node_type);
}
?>
Introduced in branch: 
1.0.x
Introduced in version: 
1.0.0
Impacts: 
Module developers
Related Github Issues: 
https://github.com/backdrop/backdrop-issues/issues/571