From 2db17fdda212574f29d06c08cc35b8668258af51 Mon Sep 17 00:00:00 2001
From: Oleksandr T <oleksandr.tarasiuk@outlook.com>
Date: Mon, 4 Apr 2022 07:42:37 +0300
Subject: [PATCH] fix(48520): fix getting parameter type by index (#48521)

---
 src/services/codefixes/fixAddMissingMember.ts      |  2 +-
 .../fourslash/codeFixAddMissingProperties20.ts     | 14 ++++++++++++++
 2 files changed, 15 insertions(+), 1 deletion(-)
 create mode 100644 tests/cases/fourslash/codeFixAddMissingProperties20.ts

diff --git a/src/services/codefixes/fixAddMissingMember.ts b/src/services/codefixes/fixAddMissingMember.ts
index ee4743f1afb..d7606830ea1 100644
--- a/src/services/codefixes/fixAddMissingMember.ts
+++ b/src/services/codefixes/fixAddMissingMember.ts
@@ -169,7 +169,7 @@ namespace ts.codefix {
             const param = signature.parameters[argIndex].valueDeclaration;
             if (!(param && isParameter(param) && isIdentifier(param.name))) return undefined;
 
-            const properties = arrayFrom(checker.getUnmatchedProperties(checker.getTypeAtLocation(parent), checker.getTypeAtLocation(param), /* requireOptionalProperties */ false, /* matchDiscriminantProperties */ false));
+            const properties = arrayFrom(checker.getUnmatchedProperties(checker.getTypeAtLocation(parent), checker.getParameterType(signature, argIndex), /* requireOptionalProperties */ false, /* matchDiscriminantProperties */ false));
             if (!length(properties)) return undefined;
             return { kind: InfoKind.ObjectLiteral, token: param.name, properties, parentDeclaration: parent };
         }
diff --git a/tests/cases/fourslash/codeFixAddMissingProperties20.ts b/tests/cases/fourslash/codeFixAddMissingProperties20.ts
new file mode 100644
index 00000000000..2c66a708e7f
--- /dev/null
+++ b/tests/cases/fourslash/codeFixAddMissingProperties20.ts
@@ -0,0 +1,14 @@
+/// <reference path='fourslash.ts' />
+
+////type T = { foo: number };
+////const foo: T[] = [];
+////[|foo.push({  })|]
+
+verify.codeFix({
+    index: 0,
+    description: ts.Diagnostics.Add_missing_properties.message,
+    newRangeContent:
+`foo.push({
+    foo: 0
+})`,
+});