nipunn1313
diff --git a/‎.gitignore‎
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diff --git a/‎CHANGELOG.md‎
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diff --git a/‎README.md‎
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diff --git a/‎mypy_protobuf/main.py‎
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diff --git a/‎pyproject.toml‎
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diff --git a/‎run_test.sh‎
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diff --git a/‎test/async_only/test_async_only.py‎
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diff --git a/‎test/generated_async_only/testproto/Capitalized/Capitalized_pb2.pyi‎
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diff --git a/‎test/generated_async_only/testproto/Capitalized/Capitalized_pb2_grpc.pyi‎
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diff --git a/‎test/generated_async_only/testproto/Capitalized/__init__.py‎ b/‎test/generated_async_only/testproto/Capitalized/__init__.py‎
@@ -10,6 +10,10 @@ __pycache__/
 !/test/generated/**/__init__.py
 /test/generated_concrete/**/*.py
 !/test/generated_concrete/**/__init__.py
+/test/generated_async_only/**/*.py
+!/test/generated_async_only/**/__init__.py
+/test/generated_sync_only/**/*.py
+!/test/generated_sync_only/**/__init__.py
 .pytest_cache
 /build/
 /dist/
 
@@ -7,6 +7,7 @@
   - Protobuf <6.32 still had the edition enums and field options, so it *should* still work. But is untested
 - Add support for editions (up to 2024)
 - Add `generate_concrete_servicer_stubs` option to generate concrete instead of abstract servicer stubs
+- Add `sync_only`/`async_only` options to generate only sync or async version of GRPC stubs
 - Switch to types-grpcio instead of no longer maintained grpc-stubs
 - Add `_HasFieldArgType` and `_ClearFieldArgType` aliases to allow for typing field manipulation functions
 - Add `_WhichOneofArgType_<oneof_name>` and `_WhichOneofReturnType_<oneof_name>` type aliases
 
@@ -348,6 +348,21 @@ By default mypy-protobuf will output servicer stubs with abstract methods. To ou
 protoc --python_out=output/location --mypy_grpc_out=generate_concrete_servicer_stubs:output/location
 ```
 
+### `sync_only/async_only`
+
+By default, generated GRPC stubs are compatible with both sync and async variants. If you only 
+want sync or async GRPC stubs, use this option:
+
+```
+protoc --python_out=output/location --mypy_grpc_out=sync_only:output/location
+```
+
+or
+
+```
+protoc --python_out=output/location --mypy_grpc_out=async_only:output/location
+```
+
 ### Output suppression
 
 To suppress output, you can run
 
@@ -13,7 +13,7 @@ line-length = 10000
 [tool.isort]
 profile = "black"
 skip_gitignore = true
-extend_skip_glob = ["*_pb2.py"]
+extend_skip_glob = ["*_pb2.py", "*_pb2_grpc.py"]
 
 [tool.mypy]
 strict = true
@@ -32,12 +32,16 @@ include = [
 exclude = [
     "**/*_pb2.py",
     "**/*_pb2_grpc.py",
-    "test/test_concrete.py"
+    "test/test_concrete.py",
 ]
 
 executionEnvironments = [
     # Due to how upb is typed, we need to disable incompatible variable override checks
     { root = "test/generated", extraPaths = ["./"], reportIncompatibleVariableOverride = "none" },
     { root = "test/generated_concrete", extraPaths = ["./"], reportIncompatibleVariableOverride = "none" },
+    { root = "test/generated_sync_only", extraPaths = ["./"], reportIncompatibleVariableOverride = "none" },
+    { root = "test/generated_async_only", extraPaths = ["./"], reportIncompatibleVariableOverride = "none" },
     { root = "mypy_protobuf/extensions_pb2.pyi", reportIncompatibleVariableOverride = "none" },
+    { root = "test/async_only", extraPaths = ["test/generated_async_only"] },
+    { root = "test/sync_only", extraPaths = ["test/generated_sync_only"] },
 ]
@@ -108,8 +108,10 @@ MYPY_PROTOBUF_VENV=venv_$PY_VER_MYPY_PROTOBUF
 
     # CI Check to make sure generated files are committed
     SHA_BEFORE=$(find test/generated -name "*.pyi" -print0 | xargs -0 sha1sum)
-    # Clean out generated/ directory - except for __init__.py
+    # Clean out generated/ directories - except for __init__.py
     find test/generated -type f -not -name "__init__.py" -delete
+    find test/generated_sync_only -type f -not -name "__init__.py" -delete
+    find test/generated_async_only -type f -not -name "__init__.py" -delete
 
     # Compile protoc -> python
     find proto -name "*.proto" -print0 | xargs -0 "$PROTOC" "${PROTOC_ARGS[@]}" --python_out=test/generated
@@ -135,6 +137,13 @@ MYPY_PROTOBUF_VENV=venv_$PY_VER_MYPY_PROTOBUF
     find proto -name "*.proto" -print0 | xargs -0 "$PROTOC" "${PROTOC_ARGS[@]}" --mypy_out=generate_concrete_servicer_stubs:test/generated_concrete
     find proto/testproto/grpc -name "*.proto" -print0 | xargs -0 "$PROTOC" "${PROTOC_ARGS[@]}" --mypy_grpc_out=generate_concrete_servicer_stubs:test/generated_concrete
 
+    # Generate with sync_only stubs for testing
+    mkdir -p test/generated_sync_only
+    find proto/testproto -name "*.proto" -print0 | xargs -0 "$PROTOC" "${PROTOC_ARGS[@]}" --mypy_grpc_out=only_sync:test/generated_sync_only --mypy_out=test/generated_sync_only --python_out=test/generated_sync_only
+
+    # Generate with async_only stubs for testing
+    mkdir -p test/generated_async_only
+    find proto/testproto -name "*.proto" -print0 | xargs -0 "$PROTOC" "${PROTOC_ARGS[@]}" --mypy_grpc_out=only_async:test/generated_async_only --mypy_out=test/generated_async_only --python_out=test/generated_async_only
 
     if [[ -n $VALIDATE ]] && ! diff <(echo "$SHA_BEFORE") <(find test/generated -name "*.pyi" -print0 | xargs -0 sha1sum); then
         echo -e "${RED}Some .pyi files did not match. Please commit those files${NC}"
@@ -153,6 +162,8 @@ for PY_VER in $PY_VER_UNIT_TESTS; do
     (
         source "$UNIT_TESTS_VENV"/bin/activate
         find proto/testproto/grpc -name "*.proto" -print0 | xargs -0 python -m grpc_tools.protoc "${PROTOC_ARGS[@]}" --grpc_python_out=test/generated
+        find proto/testproto/grpc -name "*.proto" -print0 | xargs -0 python -m grpc_tools.protoc "${PROTOC_ARGS[@]}" --grpc_python_out=test/generated_sync_only
+        find proto/testproto/grpc -name "*.proto" -print0 | xargs -0 python -m grpc_tools.protoc "${PROTOC_ARGS[@]}" --grpc_python_out=test/generated_async_only
     )
 
     # Run mypy on unit tests / generated output
@@ -162,6 +173,14 @@ for PY_VER in $PY_VER_UNIT_TESTS; do
         CONCRETE_MODULES=( -m test.test_concrete )
         MYPYPATH=$MYPYPATH:test/generated_concrete mypy ${CUSTOM_TYPESHED_DIR_ARG:+"$CUSTOM_TYPESHED_DIR_ARG"} --report-deprecated-as-note --no-incremental --python-executable="$UNIT_TESTS_VENV"/bin/python --python-version="$PY_VER_MYPY_TARGET" "${CONCRETE_MODULES[@]}"
 
+        # Run sync_only mypy
+        SYNC_ONLY_MODULES=( -m test.sync_only.test_sync_only )
+        MYPYPATH=$MYPYPATH:test/generated_sync_only mypy ${CUSTOM_TYPESHED_DIR_ARG:+"$CUSTOM_TYPESHED_DIR_ARG"} --report-deprecated-as-note --python-executable="$UNIT_TESTS_VENV"/bin/python --python-version="$PY_VER_MYPY_TARGET" "${SYNC_ONLY_MODULES[@]}"
+
+        # Run async_only mypy
+        ASYNC_ONLY_MODULES=( -m test.async_only.test_async_only )
+        MYPYPATH=$MYPYPATH:test/generated_async_only mypy ${CUSTOM_TYPESHED_DIR_ARG:+"$CUSTOM_TYPESHED_DIR_ARG"} --report-deprecated-as-note --python-executable="$UNIT_TESTS_VENV"/bin/python --python-version="$PY_VER_MYPY_TARGET" "${ASYNC_ONLY_MODULES[@]}"
+
         export MYPYPATH=$MYPYPATH:test/generated
 
         # Run mypy
@@ -210,7 +229,7 @@ for PY_VER in $PY_VER_UNIT_TESTS; do
     (
         # Run unit tests.
         source "$UNIT_TESTS_VENV"/bin/activate
-        PYTHONPATH=test/generated py.test --ignore=test/generated -v
+        PYTHONPATH=test/generated py.test --ignore=test/generated --ignore=test/generated_sync_only --ignore=test/generated_async_only -v
     )
 done
 
 
@@ -0,0 +1,86 @@
+"""
+Type-checking and runtime test for async_only GRPC stubs.
+
+This module validates that stubs generated with the only_async flag have the correct types:
+- Stub class (not AsyncStub) that only accepts grpc.aio.Channel
+- Servicer methods use AsyncIterator for client streaming (not _MaybeAsyncIterator)
+- add_XXXServicer_to_server accepts grpc.aio.Server
+"""
+
+import grpc.aio
+import pytest
+import typing_extensions as typing
+from testproto.grpc import dummy_pb2, dummy_pb2_grpc
+
+ADDRESS = "localhost:22225"
+
+
+class Servicer(dummy_pb2_grpc.DummyServiceServicer):
+    async def UnaryUnary(
+        self,
+        request: dummy_pb2.DummyRequest,
+        context: grpc.aio.ServicerContext[dummy_pb2.DummyRequest, typing.Awaitable[dummy_pb2.DummyReply]],
+    ) -> dummy_pb2.DummyReply:
+        return dummy_pb2.DummyReply(value=request.value[::-1])
+
+    async def UnaryStream(
+        self,
+        request: dummy_pb2.DummyRequest,
+        context: grpc.aio.ServicerContext[dummy_pb2.DummyRequest, typing.AsyncIterator[dummy_pb2.DummyReply]],
+    ) -> typing.AsyncIterator[dummy_pb2.DummyReply]:
+        for char in request.value:
+            yield dummy_pb2.DummyReply(value=char)
+
+    async def StreamUnary(
+        self,
+        request_iterator: typing.AsyncIterator[dummy_pb2.DummyRequest],
+        context: grpc.aio.ServicerContext[typing.AsyncIterator[dummy_pb2.DummyRequest], typing.Awaitable[dummy_pb2.DummyReply]],
+    ) -> dummy_pb2.DummyReply:
+        values = [data.value async for data in request_iterator]
+        return dummy_pb2.DummyReply(value="".join(values))
+
+    async def StreamStream(
+        self,
+        request_iterator: typing.AsyncIterator[dummy_pb2.DummyRequest],
+        context: grpc.aio.ServicerContext[typing.AsyncIterator[dummy_pb2.DummyRequest], typing.AsyncIterator[dummy_pb2.DummyReply]],
+    ) -> typing.AsyncIterator[dummy_pb2.DummyReply]:
+        async for data in request_iterator:
+            yield dummy_pb2.DummyReply(value=data.value.upper())
+
+
+def make_server() -> grpc.aio.Server:
+    server = grpc.aio.server()
+    servicer = Servicer()
+    server.add_insecure_port(ADDRESS)
+    dummy_pb2_grpc.add_DummyServiceServicer_to_server(servicer, server)
+    return server
+
+
+@pytest.mark.asyncio
+async def test_async_only_grpc() -> None:
+    server = make_server()
+    await server.start()
+    async with grpc.aio.insecure_channel(ADDRESS) as channel:
+        client = dummy_pb2_grpc.DummyServiceStub(channel)
+        request = dummy_pb2.DummyRequest(value="cprg")
+        result1 = await client.UnaryUnary(request)
+        result2 = client.UnaryStream(dummy_pb2.DummyRequest(value=result1.value))
+        result2_list = [r async for r in result2]
+        assert len(result2_list) == 4
+        result3 = client.StreamStream(dummy_pb2.DummyRequest(value=part.value) for part in result2_list)
+        result3_list = [r async for r in result3]
+        assert len(result3_list) == 4
+        result4 = await client.StreamUnary(dummy_pb2.DummyRequest(value=part.value) for part in result3_list)
+        assert result4.value == "GRPC"
+
+    await server.stop(None)
+
+    class TestAttribute:
+        stub: "dummy_pb2_grpc.DummyServiceStub"
+
+        def __init__(self) -> None:
+            self.stub = dummy_pb2_grpc.DummyServiceStub(grpc.aio.insecure_channel(ADDRESS))
+
+        async def test(self) -> None:
+            val = await self.stub.UnaryUnary(dummy_pb2.DummyRequest(value="test"))
+            typing.assert_type(val, dummy_pb2.DummyReply)
@@ -0,0 +1,71 @@
+"""
+@generated by mypy-protobuf.  Do not edit manually!
+isort:skip_file
+"""
+
+import builtins
+import google.protobuf.descriptor
+import google.protobuf.message
+import sys
+import typing
+
+if sys.version_info >= (3, 10):
+    import typing as typing_extensions
+else:
+    import typing_extensions
+
+DESCRIPTOR: google.protobuf.descriptor.FileDescriptor
+
+@typing.final
+class lower(google.protobuf.message.Message):
+    DESCRIPTOR: google.protobuf.descriptor.Descriptor
+
+    A_FIELD_NUMBER: builtins.int
+    a: builtins.int
+    def __init__(
+        self,
+        *,
+        a: builtins.int = ...,
+    ) -> None: ...
+    _ClearFieldArgType: typing_extensions.TypeAlias = typing.Literal["a", b"a"]
+    def ClearField(self, field_name: _ClearFieldArgType) -> None: ...
+
+Global___lower: typing_extensions.TypeAlias = lower
+
+@typing.final
+class Upper(google.protobuf.message.Message):
+    DESCRIPTOR: google.protobuf.descriptor.Descriptor
+
+    LOWER_FIELD_NUMBER: builtins.int
+    @property
+    def Lower(self) -> Global___lower: ...
+    def __init__(
+        self,
+        *,
+        Lower: Global___lower | None = ...,
+    ) -> None: ...
+    _HasFieldArgType: typing_extensions.TypeAlias = typing.Literal["Lower", b"Lower"]
+    def HasField(self, field_name: _HasFieldArgType) -> builtins.bool: ...
+    _ClearFieldArgType: typing_extensions.TypeAlias = typing.Literal["Lower", b"Lower"]
+    def ClearField(self, field_name: _ClearFieldArgType) -> None: ...
+
+Global___Upper: typing_extensions.TypeAlias = Upper
+
+@typing.final
+class lower2(google.protobuf.message.Message):
+    DESCRIPTOR: google.protobuf.descriptor.Descriptor
+
+    UPPER_FIELD_NUMBER: builtins.int
+    @property
+    def upper(self) -> Global___Upper: ...
+    def __init__(
+        self,
+        *,
+        upper: Global___Upper | None = ...,
+    ) -> None: ...
+    _HasFieldArgType: typing_extensions.TypeAlias = typing.Literal["upper", b"upper"]
+    def HasField(self, field_name: _HasFieldArgType) -> builtins.bool: ...
+    _ClearFieldArgType: typing_extensions.TypeAlias = typing.Literal["upper", b"upper"]
+    def ClearField(self, field_name: _ClearFieldArgType) -> None: ...
+
+Global___lower2: typing_extensions.TypeAlias = lower2
@@ -0,0 +1,10 @@
+"""
+@generated by mypy-protobuf.  Do not edit manually!
+isort:skip_file
+"""
+
+import collections.abc
+
+
+GRPC_GENERATED_VERSION: str
+GRPC_VERSION: str