The core config file for pony projects is .pony/config.yml. This file includes job definitions, source replacements and data export/import configuration. Directories data/ and scripts/ contains files essential for the creation of fully configured scratch orgs.

.
├── .pony
│   └── config.yml
├── config
│   └── project-scratch-def.json
├── data
│   ├── groups
│   │   └── packages.json
│   └── sObjects
│       ├── Account.json
│       └── Contact.json
└── force-app (src)
│   └── main
│       └── default
│           ├── classes
│           └── lwc
├── sfdx-project.json
└── scripts
    ├── apex
    │   └── insertCustomSettings.apex
    └── soql
        └── export
            ├── Account.soql
            └── Contact.soql