From cecd9144681f99f512900079289dc31ae57967e8 Mon Sep 17 00:00:00 2001
From: jycouet <jycouet@gmail.com>
Date: Fri, 26 Jun 2026 19:44:11 +0200
Subject: [PATCH] fix: print class type parameters

---
 .changeset/class-type-parameters.md                   |  5 +++++
 src/languages/ts/index.js                             |  7 +++++++
 test/samples/ts-class-type-parameters/expected.ts     |  2 ++
 test/samples/ts-class-type-parameters/expected.ts.map | 11 +++++++++++
 test/samples/ts-class-type-parameters/input.ts        |  2 ++
 5 files changed, 27 insertions(+)
 create mode 100644 .changeset/class-type-parameters.md
 create mode 100644 test/samples/ts-class-type-parameters/expected.ts
 create mode 100644 test/samples/ts-class-type-parameters/expected.ts.map
 create mode 100644 test/samples/ts-class-type-parameters/input.ts

diff --git a/.changeset/class-type-parameters.md b/.changeset/class-type-parameters.md
new file mode 100644
index 00000000..2fc6b1d1
--- /dev/null
+++ b/.changeset/class-type-parameters.md
@@ -0,0 +1,5 @@
+---
+'esrap': patch
+---
+
+fix: print class type parameters (`class Foo<T>`)
diff --git a/src/languages/ts/index.js b/src/languages/ts/index.js
index ebc60867..bb3e5bdb 100644
--- a/src/languages/ts/index.js
+++ b/src/languages/ts/index.js
@@ -653,6 +653,13 @@ export default (options = {}) => {
 
 			if (node.id) {
 				context.visit(node.id);
+			}
+
+			if (node.typeParameters) {
+				context.visit(node.typeParameters);
+			}
+
+			if (node.id || node.typeParameters) {
 				context.write(' ');
 			}
 
diff --git a/test/samples/ts-class-type-parameters/expected.ts b/test/samples/ts-class-type-parameters/expected.ts
new file mode 100644
index 00000000..d8f0e407
--- /dev/null
+++ b/test/samples/ts-class-type-parameters/expected.ts
@@ -0,0 +1,2 @@
+class Foo<T> {}
+class Baz<T> extends Bar<T> {}
\ No newline at end of file
diff --git a/test/samples/ts-class-type-parameters/expected.ts.map b/test/samples/ts-class-type-parameters/expected.ts.map
new file mode 100644
index 00000000..1f2314b2
--- /dev/null
+++ b/test/samples/ts-class-type-parameters/expected.ts.map
@@ -0,0 +1,11 @@
+{
+  "version": 3,
+  "names": [],
+  "sources": [
+    "input.js"
+  ],
+  "sourcesContent": [
+    "class Foo<T> {}\nclass Baz<T> extends Bar<T> {}\n"
+  ],
+  "mappings": "AAAA,MAAM,AAAA,GAAG,CAAC,CAAC,EAAE,CAAC,AAAA,CAAC;AACf,MAAM,AAAA,GAAG,CAAC,CAAC,UAAU,GAAG,CAAC,CAAC,EAAE,CAAC,AAAA,CAAC"
+}
\ No newline at end of file
diff --git a/test/samples/ts-class-type-parameters/input.ts b/test/samples/ts-class-type-parameters/input.ts
new file mode 100644
index 00000000..20b5a1c2
--- /dev/null
+++ b/test/samples/ts-class-type-parameters/input.ts
@@ -0,0 +1,2 @@
+class Foo<T> {}
+class Baz<T> extends Bar<T> {}