How can an Android user know which Project Mainline modules their device supports?

Question

Project Mainline (officially "Modular System Components" - https://source.android.com/devices/architecture/modular-system) introduced a set of OS components that Google can update via Google Play system updates.


Some of these modules are mandatory for OEMs to support depending on the version of Android that the phone ships with, but some of these modules are optional. OEMs can choose to add support for more modules when updating to a new version of Android, as well.


As the title states, how can an Android user determine which of these modular system components their phone actually supports?


— JBraha | Sources

Answer

Note: user IrfanLatif answered this question in a comment under the original post.


Each "Modular System Component" is stored as a single .apex file in system/apex/ or vendor/apex. The name of each file in this directory indicates which module it is. For instance, system/apex/com.google.android.tzdata.apex is the time zone data module (https://source.android.com/devices/architecture/modular-system/timezone).


I was able to see these files using a file explorer app, no root access necessary.


— JBraha | Sources

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