Definition of Done for different issue types in Jira

Hi everyone,

I am a little bit confused with the DoD concept and whether it's applicable for increment-only issue types or to all PBIs that team has. For example, in my team we have the following issue types in Jira:

1. Story - for works that will be included in the future release

2. Story (dev only) - for works that act as enablers for future increment-related works 

2. Task - basically same as a regular story, but without describing the needed scope from the user's POV

3. Bug - seems obvious here

4. Spike - for investigating & learning