Dyno file
The files: dyno.json and dyno_map.json serve to save your settings, being them, your dependencies and your scripts
The dyno file (dyno.json) is a configuration file in dyno.
In it, you specify the dependencies of your project and your scripts.
You will see next how it will be done.
Dyno Map file
The dyno_map.json is the same thing as import_map.json, without any difference, we just use this nomenclature.