| Package type | Filename/extension | Contents |
| snapshot | *.snapshot.js | Contains a snapshot of a complete S8 environment. Includes the boot code and it is expected that the package can be used to start execution of a complete S8 environment. |
| image | *.image.js | Contains classes and methods of a complete S8 image. Can be used to fill the contents of an S8 environment just after booted. |
| binary | *.st.js | Binary code produced during fileIn of a source(.st) file. It is composed by binary expressions to instantiate classes and methods while loading. |