Support decorators too

Author: sandersn

src/compiler/checker.ts

@@ -27605,7 +27605,7 @@ namespace ts {
             if (languageVersion < ScriptTarget.ES2015) {
                 checkExternalEmitHelpers(node, ExternalEmitHelpers.MakeTemplateObject);
             }
-            const signature = getResolvedSignature(node)
+            const signature = getResolvedSignature(node);
             checkDeprecatedSignature(signature, node);
             return getReturnTypeOfSignature(signature);
         }
@@ -31735,6 +31735,7 @@ namespace ts {
         /** Check a decorator */
         function checkDecorator(node: Decorator): void {
             const signature = getResolvedSignature(node);
+            checkDeprecatedSignature(signature, node);
             const returnType = getReturnTypeOfSignature(signature);
             if (returnType.flags & TypeFlags.Any) {
                 return;

tests/cases/fourslash/jsdocDeprecated_suggestion1.ts

@@ -1,4 +1,5 @@
 ///<reference path="fourslash.ts" />
+// @experimentalDecorators: true
 
 // @Filename: a.ts
 //// export namespace foo {
@@ -57,6 +58,12 @@
 //// }
 //// [|ttf``|]
 //// [|ttf|]
+//// /** @deprecated */
+//// function dec(_c: unknown) { }
+//// [|dec|]
+//// [|@dec|]
+//// class K { }
+
 // @Filename: b.ts
 //// // imports and aliases
 //// import * as f from './a';
@@ -216,61 +223,73 @@ verify.getSuggestionDiagnostics([
         "reportsDeprecated": true,
         "range": ranges[22]
     },
+    {
+        "code": 6385,
+        "message": "'dec' is deprecated",
+        "reportsDeprecated": true,
+        "range": ranges[23]
+    },
+    {
+        "code": 6385,
+        "message": "'(_c: unknown): void' is deprecated",
+        "reportsDeprecated": true,
+        "range": ranges[24]
+    },
 ]);
 goTo.file('b.ts')
 verify.getSuggestionDiagnostics([
     {
         "code": 6385,
         "message": "'bar' is deprecated",
         "reportsDeprecated": true,
-        "range": ranges[23]
+        "range": ranges[25]
     },
     {
         "code": 6385,
         "message": "'QW' is deprecated",
         "reportsDeprecated": true,
-        "range": ranges[24]
+        "range": ranges[26]
     },
     {
         "code": 6385,
         "message": "'(): void' is deprecated",
         "reportsDeprecated": true,
-        "range": ranges[25]
+        "range": ranges[27]
     },
     {
         "code": 6385,
         "message": "'(): void' is deprecated",
         "reportsDeprecated": true,
-        "range": ranges[26]
+        "range": ranges[28]
     },
     {
         "code": 6385,
         "message": "'(): void' is deprecated",
         "reportsDeprecated": true,
-        "range": ranges[27]
+        "range": ranges[29]
     },
     {
         "code": 6385,
         "message": "'QW' is deprecated",
         "reportsDeprecated": true,
-        "range": ranges[28]
+        "range": ranges[30]
     },
     {
         "code": 6385,
         "message": "'Foo' is deprecated",
         "reportsDeprecated": true,
-        "range": ranges[29]
+        "range": ranges[31]
     },
     {
         "code": 6385,
         "message": "'QW' is deprecated",
         "reportsDeprecated": true,
-        "range": ranges[30]
+        "range": ranges[32]
     },
     {
         "code": 6196,
         "message": "'O' is declared but never used.",
         "reportsUnnecessary": true,
-        "range": ranges[31]
+        "range": ranges[33]
     }
 ])