pre-load javascript kernel

Author: mishushakov

template/server/main.py

@@ -36,9 +36,12 @@ async def lifespan(app: FastAPI):
     client = httpx.AsyncClient()
 
     try:
-        default_context = await create_context(client, websockets, "python", "/home/user")
-        default_websockets["python"] = default_context.id
-        websockets["default"] = websockets[default_context.id]
+        python_context = await create_context(client, websockets, "python", "/home/user")
+        default_websockets["python"] = python_context.id
+        websockets["default"] = websockets[python_context.id]
+
+        javascript_context = await create_context(client, websockets, "javascript", "/home/user")
+        default_websockets["javascript"] = javascript_context.id
 
         logger.info("Connected to default runtime")
         yield