Pack contract

src/render/context.ts declares the pack's PackTypes once, and src/primitives/define.ts binds the SDK's definePrimitive to it so each primitive names only TNode:

// src/render/context.ts
export interface SlidePackTypes extends DefaultPackTypes {
  theme: SlideFrameTheme;
  context: SlideRenderContext;
}

// src/primitives/define.ts
export const definePrimitive = definePrimitiveFor<SlidePackTypes>();
		

• theme — the palette lower bound this pack places on a frame.
• context — the Distillate class-name context the React renderers receive. SlideReactEnv is SurfaceMap<SlidePackTypes>['react']['env'], the one env type every react renderer in the pack is written against.

Everything else stays at the SDK default. A new pack declares its own PackTypes the same way.

src/pack.ts calls definePrimitivePack<SlideFrameTheme> with styleAdapter: createDistillateStyleAdapter(slideDistillery). The theme is the declared lower bound — what any runtime holding this pack must supply to its frames. The style adapter is this pack's CSS, which a runtime runs for every pack it holds unless another pack declares one too, and which the snapshot surface emits alongside the tree. The bound is stated once, as the type argument.

The pack declares no surfaces. snapshot is not declarable — every pack reaches it through its react renderers.

Every primitive has a native slack renderer, and src/registry.test.ts fails when one does not. The containers (slideFrame, slideSplitLayout, slideStackLayout, slideWindowLayout, titleSlide for its aside, and slideAnnotatedRender for its render) render each child through scope.renderSlack, so the dispatcher decides per child: a foreign node without a slack renderer falls back through its Markdown alone. A container without a slack renderer would send its whole subtree through the Markdown fallback, and a native renderer below it would never run.

src/registry.ts is hand-maintained. It exports slideDeckPrimitives (the array) and slidePrimitiveTypes (the type strings). Keep it alphabetically sorted.