[compiler] Enum-driven visibility

.chronus/changes/witemple-msft-visibility-enum-2024-10-6-16-50-9.md

@@ -0,0 +1,7 @@
+---
+changeKind: feature
+packages:
+  - "@typespec/compiler"
+---
+
+Adds support for enum-driven visibility in the compiler core.

.chronus/changes/witemple-msft-visibility-enum-2024-10-6-16-53-11.md

@@ -0,0 +1,8 @@
+---
+changeKind: internal
+packages:
+  - "@typespec/http"
+  - "@typespec/openapi"
+---
+
+Mask deprecation on getVisibility

packages/compiler/.scripts/gen-extern-signature.ts

@@ -41,7 +41,10 @@ for (const [namespace, diagnostics] of resolved) {
 
 const files = await generateExternDecorators(program, "@typespec/compiler", { namespaces });
 for (const [name, content] of Object.entries(files)) {
-  const updatedContent = content.replace(/from "\@typespec\/compiler"/g, `from "../src/index.js"`);
+  const updatedContent = content.replace(
+    /from "\@typespec\/compiler"/g,
+    name.endsWith(".ts-test.ts") ? `from "../src/index.js"` : `from "../src/core/index.js"`,
+  );
   const prettierConfig = await resolveConfig(root);
 
   await NodeHost.writeFile(

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

@@ -1,4 +1,4 @@
-import type { DecoratorContext, Type } from "../src/index.js";
+import type { DecoratorContext, Type } from "../src/core/index.js";
 
 export type GetterDecorator = (context: DecoratorContext, target: Type) => void;