[pull] main from fern-api:main

generators/csharp/base/src/context/CsharpTypeMapper.ts

@@ -182,7 +182,12 @@ export class CsharpTypeMapper extends WithGeneration {
             dateTime: () => this.Value.dateTime,
             uuid: () => this.Primitive.string,
             // https://learn.microsoft.com/en-us/dotnet/api/system.convert.tobase64string?view=net-8.0
-            base64: () => this.Primitive.string,
+            //
+            // TODO: The protoc-gen-openapi plugin represents bytes as base64 properties. For this to
+            // be correct, we need a bytes primitive type in the IR. For now, this is only an issue in
+            // rare cases, where the SDK requires both gRPC and REST endpoints with base64 and byte[]
+            // properties.
+            base64: () => (this.context.hasGrpcEndpoints() ? this.Value.binary : this.Primitive.string),
             bigInteger: () => this.Primitive.string,
             dateTimeRfc2822: () => this.Value.dateTime,
             _other: () => this.Primitive.object

generators/csharp/base/src/proto/ProtobufResolver.ts

@@ -56,9 +56,16 @@ export class ProtobufResolver extends WithGeneration {
                         .filter((segment) => !this.namespaces.root.split(".").includes(segment))
                         .join("_")
                 );
+                // Nested proto types use underscore-separated names (e.g. "InvoiceBundle_Status")
+                // from protoc-gen-openapi. In C# protobuf codegen, nested types are
+                // accessed as "ParentMessage.Types.NestedType".
+                const originalName = protobufType.name.originalName;
+                const protoClassName = originalName.includes("_")
+                    ? originalName.split("_").join(".Types.")
+                    : originalName;
                 return this.csharp.classReference({
-                    name: protobufType.name.originalName,
-                    namespace: this.context.protobufResolver.getNamespaceFromProtobufFile(protobufType.file),
+                    name: protoClassName,
+                    namespace: protoNamespace,
                     namespaceAlias: `Proto${aliasSuffix.charAt(0).toUpperCase()}${aliasSuffix.slice(1)}`
                 });
             }

generators/csharp/codegen/src/context/extern.ts

@@ -833,6 +833,15 @@ export class Extern {
          */
         Protobuf: () =>
             lazy({
+                /**
+                 * Reference to Google.Protobuf.ByteString class.
+                 */
+                ByteString: () =>
+                    this.csharp.classReference({
+                        name: "ByteString",
+                        namespace: "Google.Protobuf"
+                    }),
+
                 /**
                  * Well-known types namespace references with namespace alias.
                  */

generators/csharp/sdk/src/wrapped-request/WrappedRequestGenerator.ts

@@ -72,6 +72,7 @@ export class WrappedRequestGenerator extends FileGenerator<CSharpFile, SdkGenera
         );
         const protobufProperties: {
             propertyName: string;
+            protoPropertyName?: string;
             typeReference: TypeReference;
         }[] = [];
 
@@ -135,6 +136,7 @@ export class WrappedRequestGenerator extends FileGenerator<CSharpFile, SdkGenera
             if (isProtoRequest) {
                 protobufProperties.push({
                     propertyName: field.name,
+                    protoPropertyName: query.name.name.pascalCase.safeName,
                     typeReference: query.allowMultiple
                         ? FernIr.TypeReference.container(FernIr.ContainerType.list(query.valueType))
                         : query.valueType
@@ -196,6 +198,7 @@ export class WrappedRequestGenerator extends FileGenerator<CSharpFile, SdkGenera
                     if (isProtoRequest) {
                         protobufProperties.push({
                             propertyName: field.name,
+                            protoPropertyName: property.name.name.pascalCase.safeName,
                             typeReference: property.valueType
                         });
                     }

generators/csharp/sdk/versions.yml

@@ -1,4 +1,16 @@
 # yaml-language-server: $schema=../../../fern-versions-yml.schema.json
+- version: 2.31.0
+  changelogEntry:
+    - summary: |
+        Add support for `base64` primitive type in the IR to represent Protobuf byte[].
+      type: feat
+    - summary: |
+        Fix the `.ToProto` and `.FromProto` mapper methods to support for enums nested within
+        message descriptors.
+      type: fix
+  createdAt: "2026-03-13"
+  irVersion: 65
+
 - version: 2.30.3
   changelogEntry:
     - summary: |

generators/go/internal/generator/sdk.go

@@ -426,7 +426,7 @@ func (f *fileWriter) WriteRequestOptionsDefinition(
 				username = authScheme.Basic.Username.PascalCase.UnsafeName
 				password = authScheme.Basic.Password.PascalCase.UnsafeName
 			)
-			f.P(`if r.`, username, ` != "" && r.`, password, ` != "" {`)
+			f.P(`if r.`, username, ` != "" || r.`, password, ` != "" {`)
 			f.P(`header.Set("Authorization", `, `"Basic " + base64.StdEncoding.EncodeToString([]byte(r.`, username, ` + ":" + r.`, password, `)))`)
 			f.P("}")
 		}

generators/go/internal/testdata/sdk/basic/fixtures/core/request_option.go

@@ -48,8 +48,8 @@ func NewRequestOptions(opts ...RequestOption) *RequestOptions {
 // for the request(s).
 func (r *RequestOptions) ToHeader() http.Header {
 	header := r.cloneHeader()
-	if r.Username != "" && r.Password != "" {
-		header.Set("Authorization", "Basic "+base64.StdEncoding.EncodeToString([]byte(r.Username+": "+r.Password)))
+	if r.Username != "" || r.Password != "" {
+		header.Set("Authorization", "Basic "+base64.StdEncoding.EncodeToString([]byte(r.Username+":"+r.Password)))
 	}
 	return header
 }

generators/go/sdk/versions.yml

@@ -1,4 +1,16 @@
 # yaml-language-server: $schema=../../../fern-versions-yml.schema.json
+- version: 1.30.2
+  changelogEntry:
+    - summary: |
+        Fix Basic Auth header not being sent when the username is an empty string.
+        Per RFC 7617, an empty user-id is valid in Basic Auth (e.g., `:password`).
+        The condition in `ToHeader()` now uses `||` instead of `&&`, so the
+        Authorization header is set whenever either the username or password is
+        non-empty.
+      type: fix
+  createdAt: "2026-03-16"
+  irVersion: 61
+
 - version: 1.30.1
   changelogEntry:
     - summary: |

generators/python/sdk/versions.yml

@@ -1,5 +1,36 @@
 # yaml-language-server: $schema=../../../fern-versions-yml.schema.json
 # For unreleased changes, use unreleased.yml
+- version: 5.0.1
+  changelogEntry:
+    - summary: |
+        Upgrade `pytest-asyncio` dev dependency from `^0.23.5` to `^1.0.0` in generated
+        `pyproject.toml`. This eliminates deprecation warnings about `asyncio.iscoroutinefunction`,
+        `asyncio.get_event_loop_policy`, and `asyncio.set_event_loop_policy` when running tests
+        on Python 3.14+.
+      type: chore
+  createdAt: "2026-03-16"
+  irVersion: 65
+
+- version: 5.0.0
+  changelogEntry:
+    - summary: |
+        Raise the default minimum Python version from `^3.8` to `^3.10` in generated
+        `pyproject.toml`. This allows the dependency resolver to pick Pydantic 2.11+ and
+        pydantic-core 2.33+, which ship pre-built wheels for Python 3.14, fixing
+        installation failures on Python 3.14.
+      type: feat
+  createdAt: "2026-03-16"
+  irVersion: 65
+
+- version: 4.64.1
+  changelogEntry:
+    - summary: |
+        Wrap `python-version` in quotes in generated GitHub CI workflow so versions like
+        `^3.10` are not misinterpreted as `3.1` by the YAML parser.
+      type: fix
+  createdAt: "2026-03-16"
+  irVersion: 65
+
 - version: 4.64.0
   changelogEntry:
     - summary: |

generators/python/src/fern_python/cli/abstract_generator.py

@@ -75,7 +75,7 @@ def generate_project(
                                     update={"installation_token": ir_publish_config.token}
                                 )
 
-        python_version = "^3.8"
+        python_version = "^3.10"
         if generator_config.custom_config is not None and "pyproject_python_version" in generator_config.custom_config:
             python_version = generator_config.custom_config.get("pyproject_python_version")
 
@@ -351,7 +351,7 @@ def _get_github_workflow_legacy(
       - name: Set up python
         uses: actions/setup-python@v4
         with:
-          python-version: {ci_python_version}
+          python-version: "{ci_python_version}"
       - name: Bootstrap poetry
         run: |
           curl -sSL https://install.python-poetry.org | python - -y --version 1.5.1
@@ -367,7 +367,7 @@ def _get_github_workflow_legacy(
       - name: Set up python
         uses: actions/setup-python@v4
         with:
-          python-version: {ci_python_version}
+          python-version: "{ci_python_version}"
       - name: Bootstrap poetry
         run: |
           curl -sSL https://install.python-poetry.org | python - -y --version 1.5.1
@@ -406,7 +406,7 @@ def _get_github_workflow_legacy(
       - name: Set up python
         uses: actions/setup-python@v4
         with:
-          python-version: {ci_python_version}
+          python-version: "{ci_python_version}"
       - name: Bootstrap poetry
         run: |
           curl -sSL https://install.python-poetry.org | python - -y --version 1.5.1
@@ -443,7 +443,7 @@ def _get_github_workflow(
       - name: Set up python
         uses: actions/setup-python@v4
         with:
-          python-version: {ci_python_version}
+          python-version: "{ci_python_version}"
       - name: Bootstrap poetry
         run: |
           curl -sSL https://install.python-poetry.org | python - -y --version 1.5.1
@@ -459,7 +459,7 @@ def _get_github_workflow(
       - name: Set up python
         uses: actions/setup-python@v4
         with:
-          python-version: {ci_python_version}
+          python-version: "{ci_python_version}"
       - name: Bootstrap poetry
         run: |
           curl -sSL https://install.python-poetry.org | python - -y --version 1.5.1
@@ -497,7 +497,7 @@ def _get_github_workflow(
       - name: Set up python
         uses: actions/setup-python@v4
         with:
-          python-version: {ci_python_version}
+          python-version: "{ci_python_version}"
       - name: Bootstrap poetry
         run: |
           curl -sSL https://install.python-poetry.org | python - -y --version 1.5.1

generators/python/src/fern_python/codegen/project.py

@@ -41,7 +41,7 @@ def __init__(
         filepath: str,
         relative_path_to_project: str,
         package_path: Optional[str] = None,
-        python_version: str = "^3.8",
+        python_version: str = "^3.10",
         project_config: Optional[ProjectConfig] = None,
         sorted_modules: Optional[Sequence[str]] = None,
         flat_layout: bool = False,

generators/python/src/fern_python/codegen/pyproject_toml.py

@@ -2,6 +2,7 @@
 
 import json
 import os
+import re
 import typing
 from abc import ABC, abstractmethod
 from dataclasses import dataclass
@@ -225,14 +226,32 @@ def to_string(self) -> str:
             if self.enable_wire_tests:
                 wire_test_deps = 'requests = "^2.31.0"\ntypes-requests = "^2.31.0"\n'
 
+            # pytest-asyncio ^1.0.0 fixes Python 3.14+ deprecation warnings but
+            # requires pytest >= 8.2 and Python >= 3.9.  Fall back to the older
+            # pair when the project still supports Python 3.8.
+            #
+            # Extract the minimum minor version from the constraint string
+            # (e.g. "^3.8" -> 8, "^3.8.1" -> 8, "^3.10" -> 10, ">=3.9" -> 9).
+            min_minor = 0
+            match = re.search(r"(\d+)\.(\d+)", self.python_version)
+            if match:
+                min_minor = int(match.group(2))
+
+            if min_minor >= 9:
+                pytest_version = "^8.2.0"
+                pytest_asyncio_version = "^1.0.0"
+            else:
+                pytest_version = "^7.4.0"
+                pytest_asyncio_version = "^0.23.5"
+
             return f"""
 [tool.poetry.dependencies]
 python = "{self.python_version}"
 {deps}
 [tool.poetry.group.dev.dependencies]
 mypy = "==1.13.0"
-pytest = "^7.4.0"
-pytest-asyncio = "^0.23.5"
+pytest = "{pytest_version}"
+pytest-asyncio = "{pytest_asyncio_version}"
 pytest-xdist = "^3.6.1"
 python-dateutil = "^2.9.0"
 types-python-dateutil = "^2.9.0.20240316"

generators/python/src/fern_python/generators/sdk/custom_config.py

@@ -100,7 +100,7 @@ class SDKCustomConfig(pydantic.BaseModel):
     # WARNING - this changes your declared python dependency, which is not meant to
     # be done often if at all. This is a last resort if any dependencies force you
     # to change your version requirements.
-    pyproject_python_version: Optional[str] = "^3.8"
+    pyproject_python_version: Optional[str] = "^3.10"
 
     # Whether or not to generate TypedDicts instead of Pydantic
     # Models for request objects.

generators/python/tests/codegen/test_github_ci_python_version.py

@@ -4,11 +4,11 @@
 
 
 class TestGithubCIPythonVersionResolver:
-    def test_resolve_default_constraint_returns_3_9(self) -> None:
-        """Default pyproject_python_version (^3.8) should resolve to 3.9 for CI."""
-        default_python_version_constraint = "^3.8"
+    def test_resolve_default_constraint_returns_3_10(self) -> None:
+        """Default pyproject_python_version (^3.10) should resolve to 3.10 for CI."""
+        default_python_version_constraint = "^3.10"
         result = GithubCIPythonVersionResolver.resolve(default_python_version_constraint)
-        assert result == PythonVersion.PY3_9
+        assert result == PythonVersion.PY3_10
 
     def test_resolve_uses_minimum_when_3_9_not_in_intersection(self) -> None:
         result = GithubCIPythonVersionResolver.resolve("^3.10")

generators/python/tests/codegen/test_python_version_utils.py

@@ -86,13 +86,8 @@ def test_impossible_constraint_returns_empty(self) -> None:
 class TestGetMinimumCompatibleVersion:
     """Tests for get_minimum_compatible_version function."""
 
-    def test_caret_3_8_returns_3_8(self) -> None:
-        """Test ^3.8 returns 3.8 as minimum."""
-        min_version = get_minimum_compatible_version("^3.8")
-        assert min_version == PythonVersion.PY3_8
-
     def test_caret_3_10_returns_3_10(self) -> None:
-        """Test ^3.10 returns 3.10 as minimum."""
+        """Test ^3.10 (the default) returns 3.10 as minimum."""
         min_version = get_minimum_compatible_version("^3.10")
         assert min_version == PythonVersion.PY3_10
 

generators/typescript/sdk/client-class-generator/src/websocket/GeneratedDefaultWebsocketImplementation.ts

@@ -42,6 +42,7 @@ export class GeneratedDefaultWebsocketImplementation implements GeneratedWebsock
     private static readonly HEADERS_PROPERTY_NAME = "headers";
     private static readonly HEADERS_VARIABLE_NAME = "_headers";
 
+    private static readonly PROTOCOLS_PROPERTY_NAME = "protocols";
     private static readonly RECONNECT_ATTEMPTS_PROPERTY_NAME = "reconnectAttempts";
     private static readonly CONNECTION_TIMEOUT_PROPERTY_NAME = "connectionTimeoutInSeconds";
     private static readonly ABORT_SIGNAL_PROPERTY_NAME = "abortSignal";
@@ -188,6 +189,19 @@ export class GeneratedDefaultWebsocketImplementation implements GeneratedWebsock
                         hasQuestionToken: context.type.isOptional(header.valueType)
                     };
                 }),
+                {
+                    name: GeneratedDefaultWebsocketImplementation.PROTOCOLS_PROPERTY_NAME,
+                    type: getTextOfTsNode(
+                        ts.factory.createUnionTypeNode([
+                            ts.factory.createKeywordTypeNode(ts.SyntaxKind.StringKeyword),
+                            ts.factory.createArrayTypeNode(
+                                ts.factory.createKeywordTypeNode(ts.SyntaxKind.StringKeyword)
+                            )
+                        ])
+                    ),
+                    hasQuestionToken: true,
+                    docs: ["WebSocket subprotocols to use for the connection."]
+                },
                 {
                     name: GeneratedDefaultWebsocketImplementation.ADDITIONAL_QUERY_PARAMETERS_PROPERTY_NAME,
                     type: getTextOfTsNode(
@@ -302,6 +316,15 @@ export class GeneratedDefaultWebsocketImplementation implements GeneratedWebsock
             );
         }
 
+        // Add protocols binding
+        bindingElements.push(
+            ts.factory.createBindingElement(
+                undefined,
+                undefined,
+                ts.factory.createIdentifier(GeneratedDefaultWebsocketImplementation.PROTOCOLS_PROPERTY_NAME)
+            )
+        );
+
         // Add additional query parameters binding
         bindingElements.push(
             ts.factory.createBindingElement(
@@ -534,7 +557,11 @@ export class GeneratedDefaultWebsocketImplementation implements GeneratedWebsock
 
         return context.coreUtilities.websocket.ReconnectingWebSocket._connect({
             url: context.coreUtilities.urlUtils.join._invoke([baseUrl, url]),
-            protocols: ts.factory.createArrayLiteralExpression([]),
+            protocols: ts.factory.createBinaryExpression(
+                ts.factory.createIdentifier(GeneratedDefaultWebsocketImplementation.PROTOCOLS_PROPERTY_NAME),
+                ts.factory.createToken(ts.SyntaxKind.QuestionQuestionToken),
+                ts.factory.createArrayLiteralExpression([])
+            ),
             options: ts.factory.createObjectLiteralExpression([
                 ts.factory.createPropertyAssignment(
                     "debug",