From 7f4e1b699a05e60977805bafef68754b653439f4 Mon Sep 17 00:00:00 2001
From: Andrew Branch <andrewbranch@users.noreply.github.com>
Date: Wed, 5 Aug 2020 10:09:45 -0700
Subject: [PATCH] Find tagless JSDoc as preceding token (#39912)

---
 src/services/utilities.ts                      |  4 ++++
 tests/cases/fourslash/completionsAfterJSDoc.ts | 17 +++++++++++++++++
 2 files changed, 21 insertions(+)
 create mode 100644 tests/cases/fourslash/completionsAfterJSDoc.ts

diff --git a/src/services/utilities.ts b/src/services/utilities.ts
index c11c65d076d..ce0c15366be 100644
--- a/src/services/utilities.ts
+++ b/src/services/utilities.ts
@@ -1217,6 +1217,10 @@ namespace ts {
         }
 
         const children = n.getChildren(sourceFile);
+        if (children.length === 0) {
+            return n;
+        }
+
         const candidate = findRightmostChildNodeWithTokens(children, /*exclusiveStartPosition*/ children.length, sourceFile);
         return candidate && findRightmostToken(candidate, sourceFile);
     }
diff --git a/tests/cases/fourslash/completionsAfterJSDoc.ts b/tests/cases/fourslash/completionsAfterJSDoc.ts
new file mode 100644
index 00000000000..eb882e3829a
--- /dev/null
+++ b/tests/cases/fourslash/completionsAfterJSDoc.ts
@@ -0,0 +1,17 @@
+/// <reference path="fourslash.ts" />
+
+////export interface Foo {
+////  /** JSDoc */
+////  /**/foo(): void;
+////}
+
+// Should not crash, #35632
+verify.completions({
+  marker: "",
+  isNewIdentifierLocation: true,
+  exact: [{
+    name: "readonly",
+    kind: "keyword",
+    sortText: completion.SortText.GlobalsOrKeywords
+  }]
+});