Merge branch 'main' into l0lawrence-emitter-diff

Author: l0lawrence

.chronus/changes/auto-decorator-setter-2026-7-14-11-0-0.md

@@ -0,0 +1,13 @@
+---
+changeKind: feature
+packages:
+  - "@typespec/compiler"
+---
+
+Add `setAutoDecorator` API to programmatically apply an `auto` decorator to a target, mirroring what the synthesized `auto dec` implementation does when the decorator is written in source. This lets emitters and mutators mark synthetic types without reaching into the program state map directly.
+
+```ts
+import { setAutoDecorator } from "@typespec/compiler";
+
+setAutoDecorator(program, "MyLib.myFlag", target);
+```

.chronus/changes/cleanup-compiler-test-describe-wrappers-2026-7-8-11-0-0.md

@@ -0,0 +1,7 @@
+---
+changeKind: internal
+packages:
+  - "@typespec/compiler"
+---
+
+Remove redundant top-level `describe` wrappers from tests

.chronus/changes/cleanup-test-describe-wrappers-2026-7-8-10-47-50.md

@@ -0,0 +1,30 @@
+---
+changeKind: internal
+packages:
+  - "@typespec/http"
+  - "@typespec/json-schema"
+  - "@typespec/rest"
+  - "@typespec/versioning"
+  - "@typespec/openapi"
+  - "@typespec/sse"
+  - "@typespec/emitter-framework"
+  - "@typespec/http-server-csharp"
+  - "@typespec/spec-api"
+  - "@typespec/http-server-js"
+  - "@typespec/asset-emitter"
+  - "@typespec/internal-build-utils"
+  - "@typespec/html-program-viewer"
+  - "@typespec/streams"
+  - "@typespec/library-linter"
+  - "@typespec/bundler"
+  - "@typespec/playground"
+  - "@typespec/spector"
+  - "@typespec/prettier-plugin-typespec"
+  - "@typespec/samples"
+  - "@typespec/spec-dashboard"
+  - "@typespec/tspd"
+  - "typespec-vscode"
+  - "@typespec/protobuf"
+---
+
+Remove redundant top-level `describe` wrappers from tests per the documented test conventions.

.chronus/changes/cli-install-extension-from-marketplace-2026-7-3-15-45-0.md

@@ -0,0 +1,9 @@
+---
+changeKind: deprecation
+packages:
+  - "@typespec/compiler"
+---
+
+`tsp code install` and `tsp vs install` now install the editor extensions from the marketplace instead of downloading the `typespec-vscode`/`typespec-vs` npm packages. `tsp code install` delegates to `code --install-extension microsoft.typespec-vscode`, and `tsp vs install` downloads the latest vsix from the Visual Studio Marketplace.
+
+The `tsp code` and `tsp vs` commands (`install`/`uninstall`) are now deprecated. They keep working but emit a deprecation warning; install and manage the extensions directly from the marketplace instead.

.chronus/changes/copilot-add-warning-on-double-suppression-2026-5-30-14-49-17.md

@@ -0,0 +1,7 @@
+---
+changeKind: fix
+packages:
+  - "@typespec/compiler"
+---
+
+Warn on duplicate `#suppress` directives on the same node.

.chronus/changes/deprecate-old-testing-framework-2026-6-11.md

@@ -0,0 +1,23 @@
+---
+changeKind: deprecation
+packages:
+  - "@typespec/compiler"
+  - "@typespec/http"
+  - "@typespec/rest"
+  - "@typespec/versioning"
+  - "@typespec/json-schema"
+  - "@typespec/xml"
+  - "@typespec/events"
+  - "@typespec/sse"
+  - "@typespec/streams"
+  - "@typespec/html-program-viewer"
+  - "@typespec/library-linter"
+  - "@typespec/emitter-framework"
+  - "@typespec/http-client-js"
+  - "@typespec/http-client"
+  - "@typespec/http-server-js"
+  - "@typespec/openapi"
+  - "@typespec/openapi3"
+---
+
+Deprecate old testing framework (`createTestHost`, `createTestRunner`, `createTestWrapper`, `createTestLibrary`, `BasicTestRunner`, `TypeSpecTestLibrary`, etc.). Use `createTester` from `@typespec/compiler/testing` instead.

.chronus/changes/fix-entrypoint-tspmain-2026-6-13.md

@@ -0,0 +1,7 @@
+---
+changeKind: fix
+packages:
+  - "@typespec/compiler"
+---
+
+Fix directory entrypoint resolution ignoring `package.json` `tspMain` when a `tspconfig.yaml` with `kind: project` is present but does not specify an `entrypoint`. The resolution order is now: explicit config `entrypoint`, then `package.json` `tspMain`, then `main.tsp`.

.chronus/changes/fix-library-feature-flags-2026-6-13.md

@@ -0,0 +1,7 @@
+---
+changeKind: fix
+packages:
+  - "@typespec/compiler"
+---
+
+Fix compiler feature flags (e.g. `auto-decorators`) not being enabled for library code. A library can now opt into a feature via its own `tspconfig.yaml` `features`, enabling it only for that library's source files without requiring the consuming project to enable it.

.chronus/changes/fix-model-base-docstrings-2026-7-8-14-9-0.md

@@ -0,0 +1,7 @@
+---
+changeKind: fix
+packages:
+  - "@typespec/http-client-python"
+---
+
+Clarify docstrings in the generated `_MyMutableMapping` base class in `_model_base.py` so they no longer use the ambiguous `D` placeholder (e.g. `Remove all items from D.` is now `Remove all items from the dictionary.`)

.chronus/changes/fix-models-mode-none-constructor-2026-7-10-9-46-0.md

@@ -0,0 +1,7 @@
+---
+changeKind: fix
+packages:
+  - "@typespec/http-client-python"
+---
+
+Fix crash when generating with `models-mode=none`. Options passed to the `OptionsDict` constructor are now normalized through the same validation/transform path as `__setitem__`, so `models-mode=none` is correctly treated as falsy and a modelless client is produced instead of crashing.