generate entity:bundle-class command generates duplicate hook implementations

[mikran]

Describe the bug

generate entity:bundle-class command attempts to create hook_entity_bundle_info_alter() without checking if one exists already

To Reproduce

Run generate entity:bundle-class twice for two different entities and check the .module file for generated hook implementations.

Expected behavior

Maybe append new lines to existing hook implementation?

Actual behavior

Duplicate hook implementation that leads to php fatal error

Workaround

Manually merge the two generated hook implementations.

System Configuration

Q	A
Drush version?	11.x
Drupal version?	9.x
PHP version	7.x
OS?	Linux

Additional information

[weitzman]

We dont try to append inside of existing functions so unfortunately this is the best we can do. See #4903 (comment)