chore: import upstream snapshot with attribution

haystack/testing/sample_components/joiner.py

@@ -0,0 +1,35 @@
+# SPDX-FileCopyrightText: 2022-present deepset GmbH <info@deepset.ai>
+#
+# SPDX-License-Identifier: Apache-2.0
+
+
+from haystack.core.component import component
+from haystack.core.component.types import Variadic
+
+
+@component
+class StringJoiner:
+    @component.output_types(output=str)
+    def run(self, input_str: Variadic[str]):
+        """
+        Take strings from multiple input nodes and join them into a single one returned in output.
+
+        Since `input_str` is Variadic, we know we'll receive a list[str].
+        """
+        return {"output": " ".join(input_str)}
+
+
+@component
+class StringListJoiner:
+    @component.output_types(output=str)
+    def run(self, inputs: Variadic[list[str]]):
+        """
+        Take list of strings from multiple input nodes and join them into a single one returned in output.
+
+        Since `input_str` is Variadic, we know we'll receive a list[list[str]].
+        """
+        retval: list[str] = []
+        for list_of_strings in inputs:
+            retval += list_of_strings
+
+        return {"output": retval}