From db0a9146b1f854daa62520d2ddb131da196ec17b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mateusz=20Burzy=C5=84ski?= <mateuszburzynski@gmail.com>
Date: Sun, 10 Aug 2025 00:54:34 +0200
Subject: [PATCH] Add missing whitespace after type parameter's modifiers in
 interactive inlay hints

---
 src/services/inlayHints.ts                    |  2 +
 ...inlayHintsTypeParameterModifiers1.baseline | 77 +++++++++++++++++++
 .../inlayHintsTypeParameterModifiers1.ts      | 10 +++
 3 files changed, 89 insertions(+)
 create mode 100644 tests/baselines/reference/inlayHintsTypeParameterModifiers1.baseline
 create mode 100644 tests/cases/fourslash/inlayHintsTypeParameterModifiers1.ts

diff --git a/src/services/inlayHints.ts b/src/services/inlayHints.ts
index 8f01d1f067428..43dad7ea1793d 100644
--- a/src/services/inlayHints.ts
+++ b/src/services/inlayHints.ts
@@ -582,6 +582,7 @@ export function provideInlayHints(context: InlayHintsContext): InlayHint[] {
                     Debug.assertNode(node, isTypeParameterDeclaration);
                     if (node.modifiers) {
                         visitDisplayPartList(node.modifiers, " ");
+                        parts.push({ text: " " });
                     }
                     visitForDisplayParts(node.name);
                     if (node.constraint) {
@@ -597,6 +598,7 @@ export function provideInlayHints(context: InlayHintsContext): InlayHint[] {
                     Debug.assertNode(node, isParameter);
                     if (node.modifiers) {
                         visitDisplayPartList(node.modifiers, " ");
+                        parts.push({ text: " " });
                     }
                     if (node.dotDotDotToken) {
                         parts.push({ text: "..." });
diff --git a/tests/baselines/reference/inlayHintsTypeParameterModifiers1.baseline b/tests/baselines/reference/inlayHintsTypeParameterModifiers1.baseline
new file mode 100644
index 0000000000000..238677cbbb8f2
--- /dev/null
+++ b/tests/baselines/reference/inlayHintsTypeParameterModifiers1.baseline
@@ -0,0 +1,77 @@
+// === Inlay Hints ===
+function test1() {
+                ^
+{
+  "text": "",
+  "displayParts": [
+    {
+      "text": ": "
+    },
+    {
+      "text": "<"
+    },
+    {
+      "text": "const"
+    },
+    {
+      "text": " "
+    },
+    {
+      "text": "T",
+      "span": {
+        "start": 44,
+        "length": 1
+      },
+      "file": "/tests/cases/fourslash/inlayHintsTypeParameterModifiers1.ts"
+    },
+    {
+      "text": ">"
+    },
+    {
+      "text": "("
+    },
+    {
+      "text": "a"
+    },
+    {
+      "text": ": "
+    },
+    {
+      "text": "T",
+      "span": {
+        "start": 44,
+        "length": 1
+      },
+      "file": "/tests/cases/fourslash/inlayHintsTypeParameterModifiers1.ts"
+    },
+    {
+      "text": ")"
+    },
+    {
+      "text": " => "
+    },
+    {
+      "text": "void"
+    }
+  ],
+  "position": 16,
+  "kind": "Type",
+  "whitespaceBefore": true
+}
+
+  return function <const T>(a: T) {};
+                                 ^
+{
+  "text": "",
+  "displayParts": [
+    {
+      "text": ": "
+    },
+    {
+      "text": "void"
+    }
+  ],
+  "position": 52,
+  "kind": "Type",
+  "whitespaceBefore": true
+}
\ No newline at end of file
diff --git a/tests/cases/fourslash/inlayHintsTypeParameterModifiers1.ts b/tests/cases/fourslash/inlayHintsTypeParameterModifiers1.ts
new file mode 100644
index 0000000000000..f537a91112d08
--- /dev/null
+++ b/tests/cases/fourslash/inlayHintsTypeParameterModifiers1.ts
@@ -0,0 +1,10 @@
+///<reference path="fourslash.ts" />
+
+//// function test1() {
+////   return function <const T>(a: T) {};
+//// }
+
+verify.baselineInlayHints(undefined, {
+  interactiveInlayHints: true,
+  includeInlayFunctionLikeReturnTypeHints: true,
+});