Module Hook to add extra field in drupal 8 content types - module

Question

I want to add an extra field in Drupal 8 content types with a custom module and I am not getting any hook to do.
Below is the hook I am using but that is not helping me with the result I want :
function nodeclass_entity_bundle_field_info(\Drupal\Core\Entity\EntityTypeInterface $entity_type, $bundle, array $base_field_definitions) {
// Add a property only to nodes of the 'article' bundle.
if ($entity_type->id() == 'node' && $bundle == 'article') {
$fields = array();
$fields['mymodule_text_more'] = BaseFieldDefinition::create('string')
->setLabel(t('More text'))
->setComputed(TRUE)
->setClass('\Drupal\mymodule\EntityComputedMoreText');
return $fields;
}
}

Answer 1

Inside your module folder, create the below folders
modules/my_module/config/install/
Then create the below files inside your module folder.
my_module/config/install/field.field.node.article.field_text_more.yml
langcode: en
status: true
dependencies:
config:
- field.storage.node.field_text_more
- node.type.article
id: node.article.field_text_more
field_name: field_text_more
entity_type: node
bundle: article
label: 'More text'
description: ''
required: false
translatable: false
default_value: { }
default_value_callback: ''
settings: { }
field_type: string
my_module/config/install/field.storage.node.field_text_more.yml
langcode: en
status: true
dependencies:
module:
- node
id: node.field_text_more
field_name: field_text_more
entity_type: node
type: string
settings:
max_length: 255
is_ascii: false
case_sensitive: false
module: core
locked: false
cardinality: 1
translatable: true
indexes: { }
persist_with_no_fields: false
custom_storage: false
Then re-install your module, it will add the new field "More text" into "Article" content type.
Note: Change file name and update the line "bundle: article" in field.field.node.article.field_text_more.yml if you wish to add fields to any other content type.