From 49a12dcbbbf974c98885cefe5ec9659166bd9d7b Mon Sep 17 00:00:00 2001
From: Oleksandr T <oleksandr.tarasiuk@outlook.com>
Date: Fri, 25 Mar 2022 00:30:26 +0200
Subject: [PATCH] fix(47081): show completion list in parenthesized object
 literal arguments (#47104)

---
 src/services/completions.ts                     |  9 +++++++--
 .../fourslash/completionListInObjectLiteral7.ts | 17 +++++++++++++++++
 2 files changed, 24 insertions(+), 2 deletions(-)
 create mode 100644 tests/cases/fourslash/completionListInObjectLiteral7.ts

diff --git a/src/services/completions.ts b/src/services/completions.ts
index 9fbbdfd339e..4af2079616e 100644
--- a/src/services/completions.ts
+++ b/src/services/completions.ts
@@ -3913,9 +3913,14 @@ namespace ts.Completions {
         if (type) {
             return type;
         }
-        if (isBinaryExpression(node.parent) && node.parent.operatorToken.kind === SyntaxKind.EqualsToken && node === node.parent.left) {
+        const parent = walkUpParenthesizedExpressions(node.parent);
+        if (isBinaryExpression(parent) && parent.operatorToken.kind === SyntaxKind.EqualsToken && node === parent.left) {
             // Object literal is assignment pattern: ({ | } = x)
-            return typeChecker.getTypeAtLocation(node.parent);
+            return typeChecker.getTypeAtLocation(parent);
+        }
+        if (isExpression(parent)) {
+            // f(() => (({ | })));
+            return typeChecker.getContextualType(parent);
         }
         return undefined;
     }
diff --git a/tests/cases/fourslash/completionListInObjectLiteral7.ts b/tests/cases/fourslash/completionListInObjectLiteral7.ts
new file mode 100644
index 00000000000..6f933ffb470
--- /dev/null
+++ b/tests/cases/fourslash/completionListInObjectLiteral7.ts
@@ -0,0 +1,17 @@
+/// <reference path='fourslash.ts'/>
+
+////type Foo = { foo: boolean };
+////function f<T>(shape: Foo): any;
+////function f<T>(shape: () => Foo): any;
+////function f(arg: any) {
+////  return arg;
+////}
+////
+////f({ /*1*/ });
+////f(() => ({ /*2*/ }));
+////f(() => (({ /*3*/ })));
+
+verify.completions({
+    marker: ["1", "2", "3"],
+    exact: ["foo"]
+});