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+---
+title: October 2023
+---
+
+# Release Notes October 2023 (2023-10-11)
+
+:::danger
+This release contains **breaking changes**
+:::
+
+## New Features
+
+### `@typespec/compiler` New Features
+
+- The `never` type is now assignable to all types.
+- Allow constraint decorators (e.g. `@minValue`, `@maxValue`, `@maxLength`, etc.) to be applied to nullable types.
+- Add support for `@returns` and `@errors` doc comment tags.
+  - `@returns`(or `@returnsDoc` decorator) can be used to describe the success return types of an operation.
+  - `@errors`(or `@errorsDoc` decorator) can be used to describe the error return types of an operation.
+- Skip emit of `deprecated` diagnostic for a type reference that is used in a deprecated declaration statement.
+- Improve website performance by removing `decorators` export and importing decorators individually.
+
+### `@typespec/http` New Features
+
+- Add support for `@returns` and `@errors` doc comment tags.
+- Add support for status code ranges for http responses. **Change to API** Http responses can now also return a `HttpStatusCodeRange` object for their status codes.
+- Emit error diagnostic when multiple properties on a response model have the `@statusCode` decorator.
+
+### `@typespec/json-schema` New Features
+
+- Disable folding of serialized yaml if line is above 80 characters.
+
+### `@typespec/openapi` New Features
+
+- Remove `@typespec/rest` as a `peerDependency`.
+- Support Http Status Code ranges.
+- **Breaking Change** Changed namespace from `OpenAPI` to `TypeSpec.OpenAPI`.
+
+### `@typespec/openapi3` New Features
+
+- Remove `@typespec/rest` as a `peerDependency`.
+- Add support for constraints on union types.
+- Add support for `@returns` and `@errors` doc comment tags.
+- Add support for http status code ranges.
+
+### `@typespec/protobuf` New features
+
+- Added support for emitting documentation comments in protobuf specifications.
+
+### `@typespec/rest` New features
+
+- Remove peer dependency on `@typespec/http` library.
+
+## Bug Fixes
+
+### `@typespec/compiler` Bug Fixes
+
+- Fix: Correct handling of hyphens in doc comments.
+- Fix: Colorization of line comments extending into the next line.
+- Fix: Crash when using parentheses in directives.
+- Fix: Allow assigning negative and 0 values to `float64` types.
+- Fix: Return non-zero format code when tsp formatting fails.
+- Fix: Correct formatting of anonymous unions to exclude leading ':' character.
+- Fix: Unions and Enum members are now formatted following the same rules as model properties. An extra line will be added between members if the member is annotated with a decorator, directive or doc comment.
+- Fix: Correct formatting of comments between a directive or doc and its node.
+- Fix: `tsp init` was not creating the `tspconfig.yaml` file for templates that specified it.
+- Fix: `tsp init` will create a placeholder `tspconfig.yaml` file for templates that don't specify an explicit one.
+- Fix: `tsp init` was ignoring the `files` specified in an init template.
+- Fix: Language Server wasn't loading the `tspconfig.yaml` correctly resulting in some options being dropped, like the linter configuration.
+- Fix: Allow `null` to be assigned as a default value.
+- Fix: Using `TypeSpec.Xyz` namespace shouldn't require the `TypeSpec Prefix`.
+
+### `@typespec/openapi3` Bug Fixes
+
+- Fix: Correctly generate discriminated union mapping property with multiple visibilities.
+- Fix: Crash when assigning a numeric default to a union.
+- Fix: Using format `ssv` or `pipes` in `@header` produced an invalid OpenAPI3 schema. It will now change the type to string, ignore the format, and emit a warning diagnostic.
+- Fix: Allow using null as a default value.
+- Fix: Allow use of `@oneOf` on model properties.
+- Fix: Correct representation of CSV format.
+- Fix: Remove incorrect `statusCode` field for operations with shared routes.
+
+### `@typespec/rest` Bug Fixes
+
+- Fix: `@key` can now appear on the base model of a resource.
+
+### `@typespec/versioning` Bug Fixes
+
+- Ensure that use of `@renamedFrom` does not result in duplicate properties on a model.
+
+## Breaking Changes
+
+### `@typespec/http` Breaking Changes
+
+- Http responses can now also return a `HttpStatusCodeRange` object for their status codes. Emitters will need to handle the additional status code content when processing status codes.
+- Emit error diagnostic when multiple properties on a response model have the `@statusCode` decorator.
+
+### `@typespec/openapi` Breaking Changes
+
+- Changed namespace from `OpenAPI` to `TypeSpec.OpenAPI`.