✨ feat(prompt_runner.py): add PromptRunner component to run a Chain with a given PromptTemplate

src/backend/langflow/components/chains/prompt_runner.py

@@ -0,0 +1,31 @@
+from langflow import CustomComponent
+
+from langchain.llms.base import BaseLLM
+from langchain import PromptTemplate
+from langchain.schema import Document
+
+
+class PromptRunner(CustomComponent):
+    display_name: str = "Prompt Runner"
+    description: str = "Run a Chain with the given PromptTemplate"
+    beta = True
+    field_config = {
+        "llm": {"display_name": "LLM"},
+        "prompt": {
+            "display_name": "Prompt Template",
+            "info": "Make sure the prompt has all variables filled.",
+        },
+        "code": {"show": False},
+        "inputs": {"field_type": "code"},
+    }
+
+    def build(
+        self,
+        llm: BaseLLM,
+        prompt: PromptTemplate,
+    ) -> Document:
+        chain = prompt | llm
+        result = chain.invoke()
+        result = result[chain.output_key]
+        self.repr_value = result
+        return Document(page_content=str(result))