Define Fiber<I> and Effect<I> types in src/host/fiber.ts

src/host/fiber.ts

@@ -0,0 +1,17 @@
+export interface Fiber<I> {
+  instance: I;
+  tag: string;
+  props: Record<string, unknown>;
+  key: string | undefined;
+  children: Fiber<I>[];
+  parent: Fiber<I> | null;
+  effect: Effect<I> | null;
+  signalDisposers: (() => void)[];
+  prevProps: Record<string, unknown> | null;
+}
+
+export type Effect<I> =
+  | { type: "update"; payload: unknown }
+  | { type: "insert"; before: Fiber<I> | null }
+  | { type: "move"; before: Fiber<I> | null }
+  | { type: "remove" };

src/mod.ts

@@ -19,5 +19,7 @@ export { ValuePointer, selectNode, setNode } from "./core/pointer.js";
 export { createRoot as createHostRoot } from "./host/config.js";
 export type { HostConfig, Root } from "./host/config.js";
 
+export type { Fiber, Effect } from "./host/fiber.js";
+
 export { TransformRegistry, childCtx, matchesSchema, ctx as transformCtx } from "./transform/registry.js";
 export type { TransformContext, TransformFn, TransformRule } from "./transform/registry.js";