feat: evaluation context

client/index.js

@@ -83,6 +83,7 @@ room.on('entityAdded', (entity) => {
   if ('string' === typeof selfEntity) {
     if (entity === room.findEntity(selfEntity)) {
       selfEntity = entity;
+      evaluationContext.selfEntity = selfEntity;
       // Add back our self entity traits.
       for (const type of selfEntityOnlyTraits) {
         entity.addTrait(type);
@@ -270,3 +271,11 @@ const UiComponent = <Ui
   throughputTicker={throughputTicker}
 />;
 ReactDOM.render(UiComponent, stage.ui);
+// Eval.
+const evaluationContext = {
+  room,
+  selfEntity,
+  stage,
+};
+// Just inject it into global for now.
+window.humus = evaluationContext;