Runtime Extensions

Runtime extensions allow third-party developers to extend apps built with the Foresight Development Kit, without access to source code.

WASM Sandboxing

Extensions are bundled as a WebAssembly (WASM) module and a manifest that defines its metadata and requirements. By using a secure sandbox, third-party code can execute without direct access to the host environment, ensuring the stability and security of the client application. Interoperability is handled through a WIT (Wasm Interface Type) interface, which allows the SDK to provide type-safe bindings for many languages, including Rust, C#, Python, and JavaScript.

Capabilities

Runtime extensions can:

• Execute Statements: Interact with the project by running any statement from the client’s standard library.
• Manage Objects: Store versioned JSON state on the server or locally.
• Automate with Scripts: Run sequences of statements to automate workflows.
• Define Tools: Create async WASM-based tools that drive form-based UI panels.

Limitations

For security and stability, runtime extensions cannot:

• Define new Statements (they must use the existing library).
• Add arbitrary Bevy plugins.
• Define custom viewport overlays or low-level interaction systems.