Moved useRootEngine to its own file

src/index.ts

@@ -1,8 +1,5 @@
 export { NodeEditor } from "./NodeEditor";
 export { FlumeConfig, Controls, Colors } from "./typeBuilders";
 export { RootEngine } from "./RootEngine";
-export const useRootEngine = (nodes, engine, context, options = {}) =>
-  Object.keys(nodes).length
-    ? engine.resolveRootNode(nodes, { ...options, context })
-    : {};
+export { useRootEngine } from "./useRootEngine";
 export * from "./types";

src/useRootEngine.ts

@@ -0,0 +1,12 @@
+import { RootEngine } from "./RootEngine";
+import { NodeMap, RootEngineOptions } from "./types";
+
+export const useRootEngine = <T extends { [inputName: string]: any }>(
+  nodes: NodeMap,
+  engine: RootEngine,
+  context: any,
+  options: RootEngineOptions = {}
+): T =>
+  Object.keys(nodes).length
+    ? engine.resolveRootNode<T>(nodes, { ...options, context })
+    : ({} as T);