Decorator post validator

.chronus/changes/decorator-post-validator-2025-10-26-18-27-31.md

@@ -0,0 +1,21 @@
+---
+# Change versionKind to one of: internal, fix, dependencies, feature, deprecation, breaking
+changeKind: internal
+packages:
+  - "@typespec/events"
+  - "@typespec/http-client"
+  - "@typespec/http"
+  - "@typespec/json-schema"
+  - "@typespec/openapi"
+  - "@typespec/openapi3"
+  - "@typespec/protobuf"
+  - "@typespec/rest"
+  - "@typespec/spector"
+  - "@typespec/sse"
+  - "@typespec/streams"
+  - "@typespec/tspd"
+  - "@typespec/versioning"
+  - "@typespec/xml"
+---
+
+Regenerate signature

.chronus/changes/decorator-post-validator-2025-11-1-16-26-16.md

@@ -0,0 +1,8 @@
+---
+# Change versionKind to one of: internal, fix, dependencies, feature, deprecation, breaking
+changeKind: feature
+packages:
+  - "@typespec/compiler"
+---
+
+[API] Introduction of decorator validator callbacks. A decorator can define some callbacks to achieve some deferred validation (After the type is finished or the whole graph is)

packages/compiler/generated-defs/TypeSpec.Prototypes.ts

@@ -1,6 +1,9 @@
-import type { DecoratorContext, Type } from "../src/index.js";
+import type { DecoratorContext, DecoratorValidatorCallbacks, Type } from "../src/index.js";
 
-export type GetterDecorator = (context: DecoratorContext, target: Type) => void;
+export type GetterDecorator = (
+  context: DecoratorContext,
+  target: Type,
+) => DecoratorValidatorCallbacks | void;
 
 export type TypeSpecPrototypesDecorators = {
   getter: GetterDecorator;