From 3792d9b34398360f4e3a13dc542b10c3e9c82a6c Mon Sep 17 00:00:00 2001
From: Oleksandr T <oleksandr.tarasiuk@outlook.com>
Date: Wed, 30 Mar 2022 11:23:58 +0300
Subject: [PATCH] fix(48405): emit dummy members from a mapped type

---
 src/compiler/emitter.ts                       |  1 +
 .../cases/fourslash/refactorExtractType76.ts  | 17 +++++++++++++++
 .../cases/fourslash/refactorExtractType77.ts  | 21 +++++++++++++++++++
 3 files changed, 39 insertions(+)
 create mode 100644 tests/cases/fourslash/refactorExtractType76.ts
 create mode 100644 tests/cases/fourslash/refactorExtractType77.ts

diff --git a/src/compiler/emitter.ts b/src/compiler/emitter.ts
index 62d3aaf19c6af..e06b0e6b8b1dc 100644
--- a/src/compiler/emitter.ts
+++ b/src/compiler/emitter.ts
@@ -2370,6 +2370,7 @@ namespace ts {
                 writeLine();
                 decreaseIndent();
             }
+            emitList(node, node.members, ListFormat.PreserveLines);
             writePunctuation("}");
         }
 
diff --git a/tests/cases/fourslash/refactorExtractType76.ts b/tests/cases/fourslash/refactorExtractType76.ts
new file mode 100644
index 0000000000000..7dc67bf84cb91
--- /dev/null
+++ b/tests/cases/fourslash/refactorExtractType76.ts
@@ -0,0 +1,17 @@
+/// <reference path='fourslash.ts' />
+
+// @Filename: a.ts
+////type Deep<T> = /*a*/{ [K in keyof T]: Deep<T[K]> }/*b*/
+
+goTo.select("a", "b");
+edit.applyRefactor({
+    refactorName: "Extract type",
+    actionName: "Extract to type alias",
+    actionDescription: "Extract to type alias",
+    newContent:
+`type /*RENAME*/NewType<T> = {
+    [K in keyof T]: Deep<T[K]>;
+};
+
+type Deep<T> = NewType<T>`,
+});
diff --git a/tests/cases/fourslash/refactorExtractType77.ts b/tests/cases/fourslash/refactorExtractType77.ts
new file mode 100644
index 0000000000000..df449726cb17e
--- /dev/null
+++ b/tests/cases/fourslash/refactorExtractType77.ts
@@ -0,0 +1,21 @@
+/// <reference path='fourslash.ts' />
+
+// @Filename: a.ts
+////type Expand<T> = T extends any
+////    ? /*a*/{ [K in keyof T]: Expand<T[K]> }/*b*/
+////    : never;
+
+goTo.select("a", "b");
+edit.applyRefactor({
+    refactorName: "Extract type",
+    actionName: "Extract to type alias",
+    actionDescription: "Extract to type alias",
+    newContent:
+`type /*RENAME*/NewType<T> = {
+    [K in keyof T]: Expand<T[K]>;
+};
+
+type Expand<T> = T extends any
+    ? NewType<T>
+    : never;`,
+});