feat: support inlay hints (#16287)

Closes: #11853

2 files changed, 18 insertions, 1 deletions

diff --git a/cli/tsc/99_main_compiler.js b/cli/tsc/99_main_compiler.js
index ab43af38d..b39f56cf6 100644
--- a/cli/tsc/99_main_compiler.js
+++ b/cli/tsc/99_main_compiler.js
@@ -898,6 +898,15 @@ delete Object.prototype.__proto__;
           ),
         );
       }
+      case "provideInlayHints":
+        return respond(
+          id,
+          languageService.provideInlayHints(
+            request.specifier,
+            request.span,
+            request.preferences,
+          ),
+        );
       default:
         throw new TypeError(
           // @ts-ignore exhausted case statement sets type to never
diff --git a/cli/tsc/compiler.d.ts b/cli/tsc/compiler.d.ts
index 31c8b8c64..ffd4695ae 100644
--- a/cli/tsc/compiler.d.ts
+++ b/cli/tsc/compiler.d.ts
@@ -77,7 +77,8 @@ declare global {
     | GetTypeDefinitionRequest
     | PrepareCallHierarchy
     | ProvideCallHierarchyIncomingCalls
-    | ProvideCallHierarchyOutgoingCalls;
+    | ProvideCallHierarchyOutgoingCalls
+    | ProvideInlayHints;
 
   interface BaseLanguageServerRequest {
     id: number;
@@ -255,6 +256,13 @@ declare global {
     position: number;
   }
 
+  interface ProvideInlayHints extends BaseLanguageServerRequest {
+    method: "provideInlayHints";
+    specifier: string;
+    span: ts.TextSpan;
+    preferences?: ts.UserPreferences;
+  }
+
   interface Restart extends BaseLanguageServerRequest {
     method: "restart";
   }