From 8f12fed3b9314439b02ef0d1e55c1c6d22795dca Mon Sep 17 00:00:00 2001
From: Jeremy Nguyen <nguyen.jeremyt@gmail.com>
Date: Fri, 3 Apr 2026 01:42:36 -0700
Subject: [PATCH] Format snippet with f-string - Fixes #26589 - Replaces
 concatenation (which can error when snippet is an int) with f-string

---
 test/other/test_emit_tsd_integer.d.ts | 12 ++++++++++++
 test/other/test_tsd_integer.ts        |  6 ++++++
 test/test_other.py                    | 11 +++++++++++
 tools/emscripten.py                   |  2 +-
 4 files changed, 30 insertions(+), 1 deletion(-)
 create mode 100644 test/other/test_emit_tsd_integer.d.ts
 create mode 100644 test/other/test_tsd_integer.ts

diff --git a/test/other/test_emit_tsd_integer.d.ts b/test/other/test_emit_tsd_integer.d.ts
new file mode 100644
index 0000000000000..e03577216b80f
--- /dev/null
+++ b/test/other/test_emit_tsd_integer.d.ts
@@ -0,0 +1,12 @@
+// TypeScript bindings for emscripten-generated code.  Automatically generated at compile time.
+declare namespace RuntimeExports {
+    let POINTER_SIZE: number;
+}
+interface WasmModule {
+  _fooVoid(): void;
+  _fooInt(_0: number, _1: number): number;
+  _main(_0: number, _1: number): number;
+}
+
+export type MainModule = WasmModule & typeof RuntimeExports;
+export default function MainModuleFactory (options?: unknown): Promise<MainModule>;
diff --git a/test/other/test_tsd_integer.ts b/test/other/test_tsd_integer.ts
new file mode 100644
index 0000000000000..e2eae0825f698
--- /dev/null
+++ b/test/other/test_tsd_integer.ts
@@ -0,0 +1,6 @@
+import moduleFactory from './test_emit_tsd_integer.js';
+
+async function go() {
+  const module = await moduleFactory();
+  module.POINTER_SIZE;
+}
diff --git a/test/test_other.py b/test/test_other.py
index f5fab92327817..2db19713c18c5 100644
--- a/test/test_other.py
+++ b/test/test_other.py
@@ -3748,6 +3748,17 @@ def test_emit_tsd_sync_compilation(self):
     cmd = shared.get_npm_cmd('tsc') + [test_file('other/test_tsd_sync.ts'), '--noEmit']
     shared.check_call(cmd)
 
+  @requires_dev_dependency('typescript')
+  def test_emit_tsd_integer(self):
+    self.run_process([EMCC, test_file('other/test_emit_tsd.c'),
+                      '--emit-tsd', 'test_emit_tsd_integer.d.ts', '-sEXPORT_ES6',
+                      '-sMODULARIZE', '-sEXPORTED_RUNTIME_METHODS=POINTER_SIZE',
+                      '-Wno-experimental', '-o', 'test_emit_tsd_integer.js'] +
+                     self.get_cflags())
+    self.assertFileContents(test_file('other/test_emit_tsd_integer.d.ts'), read_file('test_emit_tsd_integer.d.ts'))
+    cmd = shared.get_npm_cmd('tsc') + [test_file('other/test_tsd_integer.ts'), '--noEmit']
+    shared.check_call(cmd)
+
   def test_emit_tsd_wasm_only(self):
     expected = 'Wasm only output is not compatible with --emit-tsd'
     self.assert_fail([EMCC, test_file('other/test_emit_tsd.c'), '--emit-tsd', 'test_emit_tsd_wasm_only.d.ts', '-o', 'out.wasm'], expected)
diff --git a/tools/emscripten.py b/tools/emscripten.py
index d9e7384a0c934..82c623aeecc27 100644
--- a/tools/emscripten.py
+++ b/tools/emscripten.py
@@ -643,7 +643,7 @@ def create_tsd_exported_runtime_methods(metadata):
     if name in metadata.library_definitions:
       definition = metadata.library_definitions[name]
       if definition['snippet']:
-        snippet = ' = ' + definition['snippet']
+        snippet = f' = {definition["snippet"]}'
         # Clear the doc so the type is either computed from the snippet or
         # defined by the definition below.
         docs = ''