The wasm heap as bytes — the one heap view the SDK marshals through.
OptionalWebEmscripten's WebGPU object managers (exported via EXPORTED_RUNTIME_METHODS).
OptionalspecialEmscripten's special event-target registry — where the SDK registers a host canvas.
OptionalpreinitializedA device the host created and shared before boot (Emscripten's opt-in path).
The Emscripten runtime surface the SDK relies on, independent of any one engine's ABI.