How to do it...

  1. Since content entity bundles are configuration entities, we will need to define our configuration entity schema. Create a config/schema directory and mymodule.schema.yml file that will contain the configuration entity's schema:
  type: config_entity 
  label: 'Message type settings' 
      type: string 
      label: 'Machine-readable name' 
      type: string 
      label: 'UUID' 
      type: label 
      label: 'Label' 
      type: string 
      label: 'Default language' 

We will define the configuration entity's config prefix as message_type, which we will provide to Drupal in the entity's annotation block. We will tell Drupal that this is a config_entity and provide a label for the schema.

With the mapping array, we provide ...

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