From 8353accb1315a8847e4dabcd36274cde5856e763 Mon Sep 17 00:00:00 2001
From: magic-akari <akari.ccino@gmail.com>
Date: Fri, 17 Mar 2023 10:38:45 +0800
Subject: [PATCH] fix(es/codegen): Emit `type_params` for
 `TsConstructSignatureDecl` (#7080)

**Related issue:**

 - Closes https://github.com/swc-project/swc/issues/7079.
---
 crates/swc_ecma_codegen/src/typescript.rs                   | 6 +++++-
 crates/swc_ecma_codegen/tests/fixture/issues/7079/input.ts  | 3 +++
 crates/swc_ecma_codegen/tests/fixture/issues/7079/output.ts | 3 +++
 .../tests/ts-resolver/stc/1/output.ts                       | 2 +-
 4 files changed, 12 insertions(+), 2 deletions(-)
 create mode 100644 crates/swc_ecma_codegen/tests/fixture/issues/7079/input.ts
 create mode 100644 crates/swc_ecma_codegen/tests/fixture/issues/7079/output.ts

diff --git a/crates/swc_ecma_codegen/src/typescript.rs b/crates/swc_ecma_codegen/src/typescript.rs
index 2c73cb79ddf6..c60b133f650b 100644
--- a/crates/swc_ecma_codegen/src/typescript.rs
+++ b/crates/swc_ecma_codegen/src/typescript.rs
@@ -100,6 +100,10 @@ where
         self.emit_leading_comments_of_span(n.span(), false)?;
 
         keyword!("new");
+        if let Some(type_params) = &n.type_params {
+            space!();
+            emit!(type_params);
+        }
 
         punct!("(");
         self.emit_list(n.span, Some(&n.params), ListFormat::Parameters)?;
@@ -122,8 +126,8 @@ where
         }
 
         keyword!("new");
-        space!();
         if let Some(type_params) = &n.type_params {
+            space!();
             emit!(type_params);
         }
 
diff --git a/crates/swc_ecma_codegen/tests/fixture/issues/7079/input.ts b/crates/swc_ecma_codegen/tests/fixture/issues/7079/input.ts
new file mode 100644
index 000000000000..f7309f09fd2e
--- /dev/null
+++ b/crates/swc_ecma_codegen/tests/fixture/issues/7079/input.ts
@@ -0,0 +1,3 @@
+interface Foo {
+  new <T>(value: T): Obj<T>;
+}
diff --git a/crates/swc_ecma_codegen/tests/fixture/issues/7079/output.ts b/crates/swc_ecma_codegen/tests/fixture/issues/7079/output.ts
new file mode 100644
index 000000000000..02e85c6cbc9a
--- /dev/null
+++ b/crates/swc_ecma_codegen/tests/fixture/issues/7079/output.ts
@@ -0,0 +1,3 @@
+interface Foo {
+    new <T>(value: T): Obj<T>;
+}
diff --git a/crates/swc_ecma_transforms_base/tests/ts-resolver/stc/1/output.ts b/crates/swc_ecma_transforms_base/tests/ts-resolver/stc/1/output.ts
index 106c79d40a59..20b97579d4ac 100644
--- a/crates/swc_ecma_transforms_base/tests/ts-resolver/stc/1/output.ts
+++ b/crates/swc_ecma_transforms_base/tests/ts-resolver/stc/1/output.ts
@@ -4,7 +4,7 @@ interface Mixin1__1 {
 class AbstractBase__1 {
     abstractBaseMethod(): void;
 }
-function Mixin2__1<TBase__2 extends abstract new (...args: any[]) => any>(baseClass__2: TBase__2) {
+function Mixin2__1<TBase__2 extends abstract new(...args: any[]) => any>(baseClass__2: TBase__2) {
     class MixinClass__2 extends baseClass__2 implements Mixin1__1 {
         mixinMethod(): void {}
         static staticMixinMethod(): void {}