Integration: Uptake changes for witemple-msft/extern-fn (#3865)

This is an integration PR for changes related to
microsoft/typespec#9060 ([compiler] Functions,
reborn).

- TCGC: loosened an exhaustiveness check around Value kinds in
`getValueTypeValue`.
- Generally: regenerated `generated-defs` which now exports decorators
as `_decs` rather than `_` and will generate function definitions if any
are declared.

Author: witemple-msft

.chronus/changes/witemple-msft-extern-fn-2026-0-29-14-53-4.md

@@ -0,0 +1,13 @@
+---
+changeKind: internal
+packages:
+  - "@azure-tools/typespec-autorest"
+  - "@azure-tools/typespec-azure-core"
+  - "@azure-tools/typespec-azure-resource-manager"
+  - "@azure-tools/typespec-client-generator-core"
+---
+
+Uptake changes for TypeSpec functions:
+
+- Regenerated `generated-defs` signatures.
+- Updated any exhaustive checks that are invalidated by the introduction of `FunctionValue`.

core

@@ -7,4 +7,4 @@ import type { AutorestDecorators } from "./Autorest.js";
 /**
  * An error here would mean that the exported decorator is not using the same signature. Make sure to have export const $decName: DecNameDecorator = (...) => ...
  */
-const _: AutorestDecorators = $decorators["Autorest"];
+const _decs: AutorestDecorators = $decorators["Autorest"];

packages/typespec-autorest/generated-defs/Autorest.ts-test.ts

@@ -7,4 +7,4 @@ import type { AzureCoreFoundationsDecorators } from "./Azure.Core.Foundations.js
 /**
  * An error here would mean that the exported decorator is not using the same signature. Make sure to have export const $decName: DecNameDecorator = (...) => ...
  */
-const _: AzureCoreFoundationsDecorators = $decorators["Azure.Core.Foundations"];
+const _decs: AzureCoreFoundationsDecorators = $decorators["Azure.Core.Foundations"];

packages/typespec-azure-core/generated-defs/Azure.Core.Foundations.ts-test.ts

@@ -7,4 +7,4 @@ import type { AzureCoreTraitsDecorators } from "./Azure.Core.Traits.js";
 /**
  * An error here would mean that the exported decorator is not using the same signature. Make sure to have export const $decName: DecNameDecorator = (...) => ...
  */
-const _: AzureCoreTraitsDecorators = $decorators["Azure.Core.Traits"];
+const _decs: AzureCoreTraitsDecorators = $decorators["Azure.Core.Traits"];

packages/typespec-azure-core/generated-defs/Azure.Core.Traits.ts-test.ts

@@ -7,4 +7,4 @@ import type { AzureCoreDecorators } from "./Azure.Core.js";
 /**
  * An error here would mean that the exported decorator is not using the same signature. Make sure to have export const $decName: DecNameDecorator = (...) => ...
  */
-const _: AzureCoreDecorators = $decorators["Azure.Core"];
+const _decs: AzureCoreDecorators = $decorators["Azure.Core"];

packages/typespec-azure-core/generated-defs/Azure.Core.ts-test.ts

@@ -7,4 +7,4 @@ import type { AzureResourceManagerLegacyDecorators } from "./Azure.ResourceManag
 /**
  * An error here would mean that the exported decorator is not using the same signature. Make sure to have export const $decName: DecNameDecorator = (...) => ...
  */
-const _: AzureResourceManagerLegacyDecorators = $decorators["Azure.ResourceManager.Legacy"];
+const _decs: AzureResourceManagerLegacyDecorators = $decorators["Azure.ResourceManager.Legacy"];

packages/typespec-azure-resource-manager/generated-defs/Azure.ResourceManager.Legacy.ts-test.ts

@@ -7,4 +7,4 @@ import type { AzureResourceManagerDecorators } from "./Azure.ResourceManager.js"
 /**
  * An error here would mean that the exported decorator is not using the same signature. Make sure to have export const $decName: DecNameDecorator = (...) => ...
  */
-const _: AzureResourceManagerDecorators = $decorators["Azure.ResourceManager"];
+const _decs: AzureResourceManagerDecorators = $decorators["Azure.ResourceManager"];

packages/typespec-azure-resource-manager/generated-defs/Azure.ResourceManager.ts-test.ts

@@ -7,5 +7,5 @@ import type { AzureClientGeneratorCoreLegacyDecorators } from "./Azure.ClientGen
 /**
  * An error here would mean that the exported decorator is not using the same signature. Make sure to have export const $decName: DecNameDecorator = (...) => ...
  */
-const _: AzureClientGeneratorCoreLegacyDecorators =
+const _decs: AzureClientGeneratorCoreLegacyDecorators =
   $decorators["Azure.ClientGenerator.Core.Legacy"];

packages/typespec-client-generator-core/generated-defs/Azure.ClientGenerator.Core.Legacy.ts-test.ts

@@ -7,4 +7,4 @@ import type { AzureClientGeneratorCoreDecorators } from "./Azure.ClientGenerator
 /**
  * An error here would mean that the exported decorator is not using the same signature. Make sure to have export const $decName: DecNameDecorator = (...) => ...
  */
-const _: AzureClientGeneratorCoreDecorators = $decorators["Azure.ClientGenerator.Core"];
+const _decs: AzureClientGeneratorCoreDecorators = $decorators["Azure.ClientGenerator.Core"];